A particle ha an initial velocity at angle with repect to the horizontal. The maximum height it can reach i when a) = 30* b) =45* c) = 60* d) = 90*
Answers
d) = 90* The highest point it can ascend to is 90 degrees.Initial Velocity, denoted as u, is the velocity during time period t = 0.
The definitions of starting and end velocitiesWhen gravity first exerts force on an object, its initial velocity defines how quickly the object moves.The final velocity, on the other hand, is a vector number that gauges a moving body's speed and direction when it has reached maximum acceleration.
Is zero always the initial velocity?A car's starting velocity is 0 if it is at rest.A projectile's velocity profile will be greater than zero if it is thrown into the area.The starting velocity of an automobile that stops after using the brakes will be higher than zero, however the ultimate velocity will indeed be zero.
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Related Questions
Your younger brother tells you about a television show he watched where humans ride dinosaurs instead of cars. He says he wishes he could go back to the time when people lived with dinosaurs. Based on what you learned in this activity, what do you tell him?
Answers
The body needs small amounts of ________ to help enzymes break down proteins.
Answers
Answer:
I would say vitamin B-6
Explanation:
it is also known as pyridoxine. it helps ebzymes break down protein and carry the dismantled amino acids to the blood stream
Hope this helps ✌✌
Answer:
The body needs small amount of vitamin B-6 to help enzymes break down protein and carry the dismantled amino acids to the blood stream.
Two identically-sized metal spheres on insulating
stands are positioned as shown below. The
charge on sphere A is −4.0 × 10−6 coulomb and
the charge on sphere B is −8.0 × 10−6 coulomb.
The two spheres are touched together and then
separated. The total number of excess electrons
on sphere A after the separation is
Answers
Answer:
-6 x 10^-6 C
Explanation:
The two spheres will equilibrate to the same charge on each
-6 x 10^-6 C
The two spheres are touched together and then separated. The total number of excess electrons on sphere A is 3.75×10¹³ electrons after the separation.
What is electric charge ?Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C.
When the spheres touch together, they obtain equal charges. Since the spheres are same in dimension, they obtain equal charges.
Given,
q₁ = −4.0 × 10⁻⁶ C
q₂ = −8.0 × 10⁻⁶ C
q₁ + q₂ = −4.0 × 10⁻⁶ C + −8.0 × 10⁻⁶ C = -12.0 × 10⁻⁶ C
When two charged spheres touch together, they will have equal amount of charge. Means there attain equilibrium of charge.
Hence each charged sphere will have -6.0 × 10⁻⁶ C of charge.
The number of excess electrons on both the spheres will be,
(6.0 × 10⁻⁶ C) ÷ (1.6 × 10⁻¹⁹C) = 3.75 × 10¹³
The number 1.6 × 10⁻¹⁹C is called as Elementary charge.
Hence the number of excess electrons on Sphere A is 3.75 × 10¹³.
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What are two adaptations that telescope must make to account for
different types of light?
Answers
Answer: Reflecting telescopes focus light with a series of mirrors, while refracting telescopes use lenses.
Explanation:
Which image shows the correct way of lining up vectors to add them together? A. two arrows lined up facing away from each another B. two arrows lined up one after the another C. two arrows lined up facing each another D. two arrows facing opposite to each other
Answers
The image shows the correct way of lining up vectors to add them together, that the two arrows lined up one after the other, therefore the correct answer is option B.
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
Examples of vector quantities are displacement, velocity acceleration, force, etc.
Thus, the image shows the correct way of lining up vectors to add them together, that the two arrows lined up one after the other, therefore the correct answer is option B.
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A study group is meeting to prepare for an upcoming social studies test on the Civil War. Which question would you
recommend asking during the study group session to encourage more discussion?
In what year did the Civil War start?
X Are you ready for this test?
What were the most important reasons that the Civil War started?
Who was the president during most of the Civil War?
Answers
Answer:
C.What were the most important reasons that the Civil War started?
Explanation:
What were the most important reasons that the Civil War started? This question would you recommend asking during the study group session to encourage more discussion. Thus, option (c) is correct.
A discussion of the fundamental causes of the Civil War, such as the disparities in economic and social conditions between the North and South, the problem of slavery, and the divergent ideologies regarding the federal government's function in the United States, would be sparked by this question.
The group can have a more in-depth discussion on the Civil War's intricacies and learn more about the fundamental causes of the fight by posing this question. The group members will benefit from this talk by remembering the important information they need to know in order to ace their next social studies test on the Civil War.
Therefore, option (c) is correct.
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What is the necessary conditions for the production of sound?
Answers
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: Something that's vibrating, and you also need medium for those vibrations to start in.
I hope this helped!
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- Zack Slocum
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Indicate what happens when light strikes each type of matter listed below:
T = transmits straight through
B = refracts (bends)
R = reflects
A = absorbs
1) empty space (vacuum)
2) water in an aquarium
3) soil on a hillside
4) a glass window in a car
5) a brick wall
6) a lens in a camera
7) a mirror on a wall
8) water in a swimming pool
9) a roof covered with snow
10) a black shirt
Answers
empty space (vacuum): T
water in an aquarium: A, B, T
soil on a hillside: A, B
a glass window in a car: R, T
a brick wall: A, R
a lens in a camera: B
a mirror on a wall: R
water in a swimming pool: A, B, T
a roof covered with snow: A, B, T
a black shirt: A
Joule is equal to:
Awatt x metre
B.watt x second
C. Newton x Metre
D. Both b and c
Answers
Answer:
The answer is ( D) i. e both b and c.
If 30 wave crests pass by you in 10 seconds, what is the wave’s frequency?
Answers
3. A class took a field trip to a music studio. The students watched through thick glass as the musicians played
music inside the studio. The students could only hear the music when the studio door was open. The less
separating the musicians from the students is made with two layers of thick glass. The space between the glass
Layers has had all the air removed, creating a vacuum.
Which statement best explains why the students were able to see the musicians even while they were unable to
hear them?
Answers
Answer:
Sound can't travel in a vaccum.
Explanation:
Sound waves need a medium in order to travel (e.g. air, water, glass)
Since there was a vaccum between the glass the sound couldn't travel since vaccum's contain a very small amount of atoms.
The armature of a small generator consists of a flat, square coil with 190 turns and sides with a length of 1.15 cm . The coil rotates in a magnetic field of 8.70×10-^2 T
What is the angular speed of the coil if the maximum emf produced is 3.00×10?2 V ? ( Unit in rad/s)
Answers
According to the question of magnetic field, the angular speed of the coil if the maximum emf produced is 3.00×10 is approximately 196.55 rad/s.
The angular speed of the coil can be calculated using the equation: ω = (EMF) / (N × B) where ω is the angular speed in radians per second, EMF is the electromotive force (maximum emf produced), N is the number of turns in the coil, and B is the magnetic field strength.
Substituting the given values, we have: ω = (3.00×10² V) / (190 turns × 8.70×10⁻² T)
Calculating this expression, we find: ω ≈ 196.55 rad/s
Therefore, the angular speed of the coil is approximately 196.55 rad/s.
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Jim is meeting with his academic advisor. He is distracted by social media on his phone and not paying attention to the advisor. He figures he will change his major anyway, so the conversation seems pointless. Which style of listening is Jim displaying?
active
involved
passive
detached
Answers
Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions.
Jim is displaying the style of listening known as "detached." This style of listening is characterized by a lack of attention, interest, or engagement in the conversation. Jim's distraction with social media on his phone shows that he is not actively participating or focusing on what his academic advisor is saying. Additionally, his belief that the conversation is pointless because he plans to change his major indicates a disinterest in the discussion and a lack of motivation to actively listen and engage with his advisor.
Detached listening can hinder effective communication and understanding between individuals. It is important for Jim to be actively involved and attentive during his meeting with his academic advisor to ensure he receives the necessary guidance and support for his academic decisions. By actively participating and listening, he can make more informed choices about his major and benefit from the advice and expertise of his advisor.
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Jim is displaying detached listening as he is being physically present in conversation with his academic advisor but his focus is elsewhere, particularly, his phone.
Explanation:The style of listening that Jim is displaying is detached. This is because he is not paying attention to his advisor and is instead distracted by his phone. Detached listening is when one is physically present in a conversation but not mentally or emotionally engaged. Examples include browsing on the phone or thinking about other things while someone is talking.
In contrast, active or involved listening would involve fully concentrating, understanding, responding, and then remembering what is being said. Considering that Jim is mainly focused on his phone, he is not displaying any signs of this type of engagement with his advisor, hence, detached is the appropriate choice to describe his listening style.
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Which one of the following statements concerning electromagnetic waves is false?a. One form of electromagnetic radiation is visible light.b. All electromagnetic waves travel through a vacuum region at the speed of light.c. All electromagnetic waves are transverse waves.d. All electromagnetic waves have the same frequency.e. Electromagnetic waves can travel through solids, liquids, gases, and vacuumregions
Answers
Answer:
.Answer: d. All electromagnetic waves have the same frequency.
A mother is helping her children, of unequal weight, to balance on a seesaw so that they will be able to make it tilt back and forth without the heavier child simply sinking to the ground. Given that her heavier child of weight W is sitting a distance L to the left of the pivot, at what distance L1 must she place her second child of weight w on the right side of the pivot to balance the seesaw?
Express your answer in terms of L, W, and w.
L1= ?
Now consider this problem as a more formal introduction to torque. The torque of each child about the pivot point is the product of the child's weight and the distance of the child (strictly speaking, the child's center of mass) from the pivot. The sign of the torque is positive if it would cause a counterclockwise rotation of the seesaw. The distance is measured perpendicular to the line of force and is called the moment arm.
The concept of torque requires both a force and a specification of the pivot point, emphasized by the first subscript on the torque.
Part B
Find ?p,w, the torque about the pivot due to the weight w of the smaller child on the seesaw.
Express your answer in terms of L1 and w.
Tp,w???
The children's mother wants the seesaw to balance, which means that there can be no angular acceleration about the pivot. The balanced seesaw will then be in equilibrium since it has neither linear acceleration nor rotational acceleration.
For the linear acceleration to be zero, the vector sum of forces acting on the seesaw and children must equal zero.
For the angular acceleration to be zero, the sum of the torques about the pivot must equal zero. This can be written
?i?p,i=0,
where ?p,i is the torque about the pivot due to the i th force.
Part C
Determine ?i?p,i, the sum of the torques on the seesaw. Consider only the torques exerted by the children.
Express your answer in terms of W, w, L, and L1.
The child with weight w has an identical twin also of weight w. The two twins now sit on the same side of the seesaw, with one twin a distance L2 from the pivot and the other a distance L3. (Figure 2)
Part D
Where should the mother position the child of weight W to balance the seesaw now?
Express your answer in terms of L2, L3, W, and w. L=????
Bad news! When the mother finds the distance L from the previous part it turns out to be greater than Lend, the distance from the pivot to the end of the seesaw. Hence, even with the child of weight W at the very end of the seesaw the twins exert more torque than the heavier child does. The mother now elects to balance the seesaw by pushing sideways on an ornament (shown in red) that is a height h above the pivot. (Figure 3)
Part E
With what force in the rightwards direction, Fx, should the mother push? Note that if you think the force exerted by the mother should be toward the left, your final answer Fx should be negative.
Express your answer in terms of W, Lend, w, L2, L3, and h.
Fx= ????
Answers
The distance L1 that the mother must place her second child of weight w on the right side of the pivot to balance the seesaw is (WL)/(W+w).
To balance the seesaw, the torques on both sides of the pivot must be equal. The torque due to the heavier child is W*L, and the torque due to the smaller child is w*L1. Therefore, to balance the seesaw, we need to have W*L = w*L1, which gives us L1 = (W*L)/(W+w).
For part B, the torque about the pivot due to the weight w of the smaller child is w*(Lend-L1), since the moment arm is the distance between the pivot and the child's position.
For part C, the sum of the torques on the seesaw is given by W*L - w*L1, since the torque due to the heavier child is positive and the torque due to the smaller child is negative.
For part D, the mother should position the child of weight W at a distance L from the pivot, where L = (w*L2 + w*L3)/(W+2w).
For part E, the mother should push with a force of Fx = (W+w)*g*h/(Lend - L1), where g is the acceleration due to gravity.
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Peyote contains a psychotropic drug called __________.
A.
guarana
B.
mescaline
C.
salvia
D.
dynorphins
Answers
Answer:
B. Mescaline
Explanation:
Answer:
Peyote contains a psychotropic drug called mescaline
or B
Explanation:
if energy of 10 watts is transferred into a chamber of helium, how long does it take to vaporize 1 kg of liquid helium
Answers
energy takes 25 atmospheres of pressure to evaporate 1 kilogrammes liquid helium, and that pressure must be applied at or below the freezing point of helium, which is 458 °F.
How is helium in liquid form transported?From manufacturing sources to stockpiling and transfill facilities, liquid helium is normally delivered. Tankers with a capacity of 5,000 and 11,000 gallons have an annular space that is vacuum-sealed, nitrogen-shielded, and has multiple layers of insulation.
How is liquid helium produced?You need to chill helium gas to just a few temperatures above absolute zero in order to produce the liquid & superfluid states. By compressing the air and then releasing it through a tiny nozzle, this is accomplished. If you've used any aerosol, you may have noticed that the gas rapidly cools as it expands.
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The atoms ,molecules,or compound present at the start of a chemical reaction that parcitipate in the reaction . which part of a chemical reaction does this define?
Answers
Answer:
The atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.
Explanation:
The chemical reaction is the way in which one substance reacts against another. So, a chemical reaction consists of the transformation of some substances into others, that is, the process of arranging atoms and bonds when chemical substances come into contact.
In a chemical reaction, the initial substances are called reactants, while the new substances obtained are called products.
So, the atoms ,molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction are the reactants.
the 2-lb brick slides down a smooth roof, such that when it is at a it has a velocity of 5 ft/s.
Answers
The unstretched length so that it does not allow the block to leave the surface until θ= 60° is L = 4.574 ft.
Given:
The weight of the block W = 2 lb
The initial velocity of the block v_i = 0
The stiffness of the spring k = 2 lb/ft
The radius of the cylindrical surface r = 2 ft
Compute the velocity of the block at θ= 60°. Use Newton's second equation of motion in direction normal to the surface.
= F_n = m X a_n
Where, a_n is the centripetal acceleration or normal component of acceleration as follows:
= a_n = v²_2 / r
Substitute:
= F_n = m*v²2 / r
Where, F_n normal force acting on block by the surface is:
= F_n = W X cos(θ)
Substitute:
W*cos(θ) = m*v^2_2 / r
v_2 = sqrt ( r*g*cos(θ) )
Plug in the values:
v²_2 = 2 X 32.2 X cos(60)
v²_2 = 32.2 (ft/s)²
Apply the conservation of energy between points A and B where θ= 60° :
T_A + V_A = T_B + V_B
Where,
T_A : Kinetic energy of the block at initial position = 0
V_A: potential energy of the block initial position
V_A = 0.5 X k X x_A²
x_A = 2 X π- L ( L is the original length )
V_A = 0.5X 2 X (2 X πi - L)² =
= (2 X pi - L)²
T_B = 0.5 X W/g X v_2² =
= 0.5 X 2 / 32.2 X 32.2 = 1
V_B = 0.5 X k X x_B² + W X 2 X cos(60)
and, x_B = 2 X 0.75 X π - L ( L is the original length )
V_B = 0.5 X 2 X (1.5 X π - L)² + 2 X 1
= 2 + ( 1.5 X π- L )²
Input the respective energies back in to the conservation expression:
= 0 + (2π - L)² = 1 + 2 + ( 1.5π - L )²
= 4π² - 4πL + L² = 3 + 2.25π² - 3πL + L²
= πL = 1.75π² - 3
= L = 4.574 ft
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The complete question;
the 2-lb brick slides down a smooth roof, such that when it is at a it has a velocity of 5 ft/s. The 2-lb block is released from rest at A and slides down along the smooth cylindrical surface. Of the attached spring has a stiffness k = 2 lb/ft. Determine its unstretched length so that it does not allow the block to leave the surface until θ= 60°.
Why do we use the hydrogen spectrum to identify if a star is red or blue
shifted? *
Answers
Answer:
But if you place a clear container filled with hydrogen gas between the flashlight and the prism, gaps appear in the smooth rainbow of colors, places where the light literally goes missing. The dark absorption lines of a star at rest (left) get shifted towards red if the star is moving away from Earth (right)
Explanation:
Una cuerda de longitud 9,8 metros se somete a una tensión de 500N. Si su masa es de 93 kilogramos. La densidad lineal es:
Answers
The linear density of the string is 9.49 kg/m.
What is the Linear density?Linear density is commonly used in physics and engineering to analyze the properties and behavior of strings, wires, and cables.
Linear density (ρ) is defined as the mass per unit length of a string or wire. To find the linear density, we can divide the mass of the string by its length. Given that the string has a length (L) of 9.8 meters and a mass (m) of 93 kilograms, we can use the formula:
ρ = m / L
Plugging in the values, we have:
ρ = 93 kg / 9.8 m
Calculating this, we find:
ρ ≈ 9.49 kg/m
the linear density of the string is approximately 9.49 kg/m.
Therefore, that for every meter of the string, there is an average mass of 9.49 kg.
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A hiker travels 12 km in a direction of 50 degrees west of north. What are the north and west components of this displacement?
Answers
The north and west components of this displacement are 9.19 km and -7.71 km respectively.
North component of the displacement
The north component of the displacement is calculated as follows;
Dy = D sinθ
Dy = 12 km x sin50
Dy = 9.19 km
West component of the displacementDx = D x cosθ
Dx = - 12 km x cos(50)
Dx = -7.71 km
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What are the chances that radio transmissions from Earth or messages sent on distant space probes will ever be received by living beings
Answers
Answer:
Very low
Explanation:
It is fair to say to a reasonable extent that there are very low chances that radio transmissions from Earth or messages sent on distant space probes will ever be received by living beings .
Bear in mind that for years some scientists have believed without any substantial evidence that there are other living beings in distant space.
if the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? use energy methods.
Answers
The ski will travel a distance of (2μL/3) + (2/3)h along the level at the foot of the incline.
Assuming that the ski starts from rest at the top of the incline and slides down the incline without any loss of energy due to friction or air resistance, the potential energy of the ski at the top of the incline is converted entirely into kinetic energy as it slides down the incline. When the ski reaches the bottom of the incline, all of the kinetic energy is transferred into potential energy and frictional work done by the coefficient of friction, bringing the ski to a stop.
Let's denote the height of the incline by h, the length of the incline by L, and the coefficient of friction between the ski and the snow by μ.
The potential energy of the ski at the top of the incline is given by:
PE = mgh
where m is the mass of the ski and g is the acceleration due to gravity. At the bottom of the incline, the potential energy is zero, and the kinetic energy of the ski is given by:
KE = (1/2)m\(v^2\)
where v is the speed of the ski at the bottom of the incline.
Since there is no net work done on the ski by external forces, the total energy of the ski is conserved, i.e.,
PE(top of incline) = KE(bottom of incline) + Work(friction)
mgh = (1/2)m\(v^2\) + μmgd
where d is the distance traveled by the ski along the level at the foot of the incline. Since the ski starts from rest at the top of the incline, we can also use the equation:
\(v^2\) = 2gh
To eliminate v from the above equation, giving:
d = (2μL/3) + (2/3)h
Therefore, the ski will travel a distance of (2μL/3) + (2/3)h along the level at the foot of the incline.
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Name the following ionic compounds: BeCl2
Answers
Answer:
Beryllium chloride
Explanation:
I hope this helps!
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What is the momentum of a 950 kg car moving at 10.0 m/s?
9.5 kgm/s
95 kgm/s
9500 kgm/s
95000 kgm/s
Answers
Answer:
The answer is 9500 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 950 kg
velocity = 10.0 m/s
We have
momentum = 950 × 10
We have the final answer as
9500 kgm/sHope this helps you
Two planets, alice and bob, have the same radius. Alice has a greater density than bob. Which has the higher escape velocity?
Answers
Answer:
Since Alice has a greater density it will also have a greater mass
Density = mass / volume
The potential energy at the surface of Alice will be greater and a higher kinetic energy will be required to escape the planet's gravitational pull.
PE = K M / R potential at surface is greater because mass is greater
KE = 1/2 M v^2 greater velocity required to overcome PE
What is the science behind Infrared thermometer ?
Answers
Answer:
Infrared thermometers employ a lens to focus the infrared light emitting from the object onto a detector known as a thermopile. The thermopile is nothing but thermocouples connected in series or parallel. When the infrared radiation falls on the thermopile surface, it gets absorbed and converts into heat.
What is conflict resolution?
A.) committing to fair play
B.) settling a dispute or disagreement
C.) working toward a common goal
D.)trying your best to win
Answers
Answer:
B) Settling a dispute or disagreement
Explanation:
A conflict is a disagreement or argument between opposing parties.
A resolution is a solution to a problem.
Knowing both these definitions, the answer choice that makes the most sense would be B) Settling a dispute or disagreement.
Hope this helps!!
what is point A ?
kinetic Energy
Gravitational potential energy
Spring potential Energy
heat
or none of this
what is point B ?
kinetic Energy
Gravitational potential energy
Spring potential Energy
heat
or none of this
what is point C?
kinetic Energy
Gravitational potential energy
Spring potential Energy
heat
or none of this
what is point D ?
kinetic Energy
Gravitational potential energy
Spring potential Energy
heat
or none of this
Answers
Answer:
A Gravitational potential energy
Bkinetic Energy
CGravitational potential energy
Dnone of this