Answer:
D
Explanation:
Weight and force have same derived units
How is the density of water different from the densities of most other substances?
Please in your own words!!!!
Answer:
In practical terms, density is the weight of a substance for a specific volume. The density of water is roughly 1 gram per milliliter but, this changes with temperature of if there are substances dissolved in it. Ice is less dense than liquid water which is why your ice cubes float in your glass.
Explanation:
What is the cause of change in properties of matter
Answer:
Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
Explanation:
Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called reactants, and the end results are called products.
As a sound wave changes from one to another, it will often be refracted.A. frequency B. amplitude C. medium D. wavelength?
Answer: the answer is medium
Explanation:
1. who was john locke?
2. what were his 3 big ideas?
3. what does each of his 3 big ideas mean?
Question 10 Marks: 1 The valley or ravine landfill method utilizes "lifts" from the bottom up with depths usually ofChoose one answer. a. 6 to 8 feet b. 8 to 10 feet c. 10 to 12 feet d. 12 to 14 feet
The valley or ravine landfill method utilizes "lifts" from the bottom up with depths usually of 6 to 8 feet.
This means that the landfill is built up in layers or lifts, with each layer being 6 to 8 feet deep. The waste is then compacted and covered with a layer of soil before the next lift is added. This method is used in valleys or ravines because it allows for the natural contours of the land to be used, minimizing the need for excavation and land disturbance. It also helps to contain the waste in a specific area, making it easier to manage and monitor. Overall, the valley or ravine landfill method is an efficient and environmentally responsible way to dispose of waste.
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I NEED THIS ASAP
Give me 3 Facts about motion
Write them in complete sentences
Answer:
In physics, motion is the phenomenon in which an object changes its position over time.
There are 3 laws of motion also known as Newton's laws of motion.
The 3 laws are the law of inertia, law of momentum and 3rd law of motion.
A race car is traveling at a speed of 80. 0 m/s on a circular racetrack of radius 450 m. What is it's centripetal acceleration in m/s2?.
Answer:
14.2m/s^2
Explanation:
The centripetal acceleration of the race car is 14.22 m/s².
What is centripetal acceleration?Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.
In your daily existence, you must have encountered numerous instances of centripetal acceleration. A centripetal acceleration occurs when you drive in a circle, and a centripetal acceleration also occurs when a satellite orbits the earth. Centripetal refers to being in the center.
Given that: Speed of the race car: v = 80.0 meter/second.
Radius of the racetrack: r = 450 meter.
Hence, the centripetal acceleration of the car is = v²/r
= (80.0)²/450 m/s²
= 14.22 m/s².
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A simple gear train has 2 spur gears. The input gear has 20 teeth and the output gear has 100 teeth. The input rotates at 2000 rev/min clockwise. Calculate the gear ratio and the output speed. (5 and 400 rev/min anticlockwise). The input torque is 15 Nm and the efficiency is 65 %. Calculate the output power and the holding torque. (2042 W and 33.75 Nm clockwise)
The gear ratio in this simple gear train is 5, the output speed of the gear train is 400 rev/min anticlockwise, the output power of the gear train is approximately 2042 W and the holding torque of the gear train is 75 Nm clockwise.
What is torque?
Torque, denoted by the symbol τ (tau), is a measure of the force that can cause an object to rotate about an axis.
Given:
Number of teeth on the input gear (N1) = 20
Number of teeth on the output gear (N2) = 100
Gear Ratio = 100 / 20 = 5
Therefore, the gear ratio in this simple gear train is 5.
To calculate the output speed, we can use the formula:
Output Speed = (Input Speed / Gear Ratio)
Given:
Input Speed (ω1) = 2000 rev/min
Output Speed = (2000 rev/min) / 5 = 400 rev/min
Therefore, the output speed of the gear train is 400 rev/min anticlockwise.
To calculate the output power, we can use the formula:
Output Power = (Input Power * Efficiency)
Given:
Input Torque (T1) = 15 Nm
Efficiency = 65% = 0.65 (decimal value)
Input Power = (Input Torque * Input Speed)
Given:
Input Speed (ω1) = 2000 rev/min
Input Speed (ω1) in rad/s = (2000 rev/min) * (2π rad/rev) / (60 s/min)
Input Power = (15 Nm) * (2000 rev/min) * (2π rad/rev) / (60 s/min)
Output Power = (Input Power * Efficiency) = (15 Nm) * (2000 rev/min) * (2π rad/rev) / (60 s/min) * 0.65
Output Power ≈ 2042 W
Therefore, the output power of the gear train is 2042 W.
To calculate the holding torque, we need to consider the output torque (T2) and the gear ratio.
Output Torque (T2) = (Input Torque * Gear Ratio)
Given:
Gear Ratio = 5
Output Torque (T2) = (15 Nm) * 5 = 75 Nm
Therefore, the holding torque of the gear train is 75 Nm clockwise.
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What is the gravitational attraction between two objects of mass of five million kg (5.0 x 10^6) at a distance of 100 meters from each other? Estimate G as 6.67 x 10^-11 N (m/kg)
Answer:
G = 6.67
Explanation:
Global average temperature increases when energy absorbed by the surface ___?
Answer:
se elevator a maas eneergia mas alta
50 POINTS!!!!
A certain atom has 11 electrons, 8 neutrons, and a charge of -1. What is its atomic mass?
A. 19
B. 15
C. 11
D. 18
Answer:
19
Explanation:
To find the atomic mass, you have to add together the number of neutrons and protons. It gives you the number of neutrons and the number of electrons is the same amount as the protons
The force of _______ acts in the opposite direction of motion of an object.
A
gravity
B
spring
C
friction
D
magnet
The force of friction acts in the opposite direction of motion of an object. The statement given in the question is completed by friction. This is because the force of friction always acts in the opposite direction of the motion of object.
Let's learn more about friction: Friction is a force that opposes motion when two objects are in contact with each other. When two surfaces rub against each other, the frictional force opposes the motion of the objects and slows them down. The three main types of friction are static, sliding and rolling friction.
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The force that acts in the opposite direction of motion of an object is friction.
In physics, when an object is in motion, it experiences various forces that can either support or oppose its motion. One such force is called the opposing force, which acts in the opposite direction of the object's motion. The force of friction is a common example of an opposing force.
Friction is the force that opposes the relative motion between two surfaces in contact. It occurs when there is a resistance to the sliding or rolling motion of an object. Friction can be caused by the roughness of surfaces or the presence of fluids, such as air or water.
When an object moves through a fluid medium, it experiences a drag force that opposes its motion. Air resistance is a type of drag force that acts on objects moving through the air.
Therefore, the correct answer is C. friction.
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A block of wood is 10 cm long ,by 4cm broadby1.5 cm thik the block weighs 31g find the density of the wood in kg/m3
Answer:
/////////////////////////////////////////////////
Explanation:
Tech A says that when checking a voltage drop across an open switch, a measurement of 12 volts is normal. Tech B says that when checking voltage drop across an open switch, a measurement of 12 volts means there are 12 volts on each side of the switch. Who is correct
Answer:
Tech B is correct.
Explanation:
The voltage drop between the two terminals of a circuit is the measurement of the potential difference between the two terminals.
If \(v_1\) and \(v_2\) ( assuming \(v_1 > v_2\)) are potentials at terminal 1 and terminal 2 of the given open circuit.
According to A, the measurement of the potential drop is 12 volts, i.e
The measurement of potential difference \(=v_1 -v_2\)
= 12 volts which is correct.
But according to B, a measurement of 12 volts means there are 12 volts on each side of the switch (\(v_1= 12\) volts and \(v_2=12\) volts), i.e
According to the claim of B, the potential difference (or drop) across the terminals is
\(v_1-v_2= 12-12=0\) but the measured potential drop is 12 volts, so B is wrong.
Hence, Tech B is correct.
how much taller (in m) does the eiffel tower become at the end of a day when the temperature has increased by 18°c? its original height is 324 m and you can assume it is made of steel.
The height of the Eiffel Tower increases as the temperature increases due to thermal expansion. Thermal expansion is the increase in size or volume of a material due to an increase in temperature.
The equation for linear thermal expansion is:
ΔL = αL₀ΔT
Where:
- ΔL is the change in length
- α is the coefficient of thermal expansion
- L₀ is the original length
- ΔT is the change in temperature
For steel, the coefficient of thermal expansion is 11 x 10⁻⁶ /°C.
Plugging in the given values into the equation:
ΔL = (11 x 10⁻⁶ /°C)(324 m)(18°C)
ΔL = 0.06408 m
Therefore, the Eiffel Tower becomes 0.06408 m taller at the end of a day when the temperature has increased by 18°C.
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an object moves by an observer at 0.500 c (1/2 the speed of light). the total energy of the object will be what factor times that of the rest energy?
The total energy of the object will be 1.1547 times the rest energy (\(m0c^2\)).
According to the theory of special relativity, the energy of an object in motion is given by the equation E = γm0c², where γ is the Lorentz factor, m0 is the rest mass of the object, and c is the speed of light. The Lorentz factor is given by the equation γ = 1/√(1-v²/c²), where v is the velocity of the object.
In this case, the object is moving at 0.500 c, so v/c = 0.500. Plugging this value into the Lorentz factor equation gives γ = 1/√(1-0.500²) = 1.1547.
The rest energy of the object is given by E0 = m0c². Since we don't know the mass of the object, we can't calculate its rest energy directly. However, we can calculate the factor by which its total energy exceeds its rest energy:
E/ E0 = (γm0c²) / (m0c²) = γ
Plugging in the Lorentz factor, we get E/E0 = 1.1547. So the total energy of the object is 1.1547 times its rest energy.
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What is the net force on a bathroom scale when a 110 pound person stands on it? How do you know?
) A cable car at a ski resort carries skiers a distance of 6. 8 km. The cable which moves the car is driven by a pulley with diameter 3. 0 m. Assuming no slippage, how fast must the pulley rotate for the cable car to make the trip in 12 minutes
The pulley must rotate at a speed of approximately 1.99 radians per second for the cable car to make the trip in 12 minutes.
To determine the rotational speed of the pulley, we need to calculate the angular velocity (ω) in radians per second.
Distance traveled by the cable car = 6.8 km
Time taken to make the trip = 12 minutes
First, let's convert the distance to meters:
Distance = 6.8 km = 6,800 meters
Next, let's convert the time to seconds:
Time = 12 minutes = 12 * 60 seconds = 720 seconds
The linear speed (v) of the cable car can be calculated using the formula:
v = distance / time
v = 6,800 meters / 720 seconds
v ≈ 9.44 m/s
The linear speed of the cable car is equal to the circumference of the pulley multiplied by its angular velocity:
v = 2πrω
where r is the radius of the pulley (half of its diameter).
Given the diameter of the pulley is 3.0 m, the radius is:
r = 3.0 m / 2 = 1.5 m
Substituting the values into the equation:
9.44 m/s = 2π(1.5 m)ω
To solve for ω, divide both sides by 2π(1.5 m):
ω = 9.44 m/s / (2π(1.5 m))
ω ≈ 1.99 rad/s
Therefore, the pulley must rotate at a speed of approximately 1.99 radians per second for the cable car to make the trip in 12 minutes.
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what type of government did south africa have
Answer:
A parliamentary republic with a 3 tier system
Explanation:
The judiciary is independent, with everything operating in a parliementary republic. Legislative authority is held by the Parliament of South Africa.
How does the Coriolis effect impact the Gulf Stream and the Brazil Current?
Answer: The Coriolis effect results in bending the direction of surface currents to the right in the Northern Hemisphere and left in the Southern Hemisphere. The Coriolis effect causes winds and currents to form the circular patterns. The direction in which they spin depends upon the hemisphere in which they are present.Coriolis Effect is named after the French mathematician and physicist Gaspard-Gustave de Coriolis. It affects the weather patterns of an area, it affects the ocean currents, and it also affects air quality.
Write whether true or false...
a The forces on a floating object are balanced.
b The forces on a rocket taking off are balanced.
c The forces on a leaf accelerating to the ground are unbalanced.
d All objects that accelerate have balanced forces acting on them
Corrected versions of false statements:
E
Answer:
a --> true, b --> false, c --> true, d -->false
Explanation:
a) since it stays floating the gravity force and the upqards push is the same
b) if it's balanced the rocket won't move from the ground, the force of the rocket, has to exceed the force of gravity
c) since it's going in a diretion the force of gravity is exceeding the force pushing it up
d) since that are speeding up at a rate, meaning growing, the force is unbalanced.
suppose a box with a mass of 10 kg compresses a horizontal spring a distance x . the spring then launches the box horizontally outward from a cliff of height 10 m , and the box hits the ground with a speed of 20 m/s . assuming the spring constant is 500 n/m , what was the spring's initial compression x ?
According to the given statement The spring had a 28.3 cm initial compression.
What is the spring constant K?The "spring constant," denoted by the symbol "k," is a figure that effectively indicates how "stiff" a spring is. A significant value of k indicates that more power is needed to extend it a given distance than would be necessary to stretch a less stiff spring the same distance.
When a spring is squeezed by a distance x, its potential energy is given by:
PE = (1/2)kx²
the spring constant being k.
Hence, the box's current potential energy is:
PE = mgh
As the box strikes the ground, it has the following kinetic energy:
KE = (1/2)mv²
where v denotes the box's speed.
As all mechanical energy is conserved, the following results:
PE = KE
(1/2)kx² = mgh + (1/2)mv²
Substituting the given values, we get:
(1/2)(500 N/m)x²
x²= (10 kg)(9.8 m/²)(10 m) + (1/2)(10 kg)(20 m/s)²
x² = [2(10 kg)(9.8 m/s²)(10 m) + 10 kg(20 m/s)²] / 500 N/m
x² = 804
x = 28.3 cm.
Hence, the spring had a 28.3 cm initial compression.
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he first right-hand rule relates which two quantities?
A.
current (thumb) to magnetic field (fingers)
B.
magnetic field (thumb) to current (fingers)
C.
current (thumb) to force (fingers)
D.
force (thumb) to current (fingers)
Reset Next
Answer: A.
current (thumb) to magnetic field (fingers)
Answer:
A. current (thumb) to magnetic field (fingers)
Explanation:
According to the Right-Hand Thumb rule, if we are holding a current- carrying straight conductor in our right hand such that the thumb points toward the direction of current, then the fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
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A ladder (ℓL = 7.80 m) of weight WL = 350 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose weight is 885 N, stands 6.40 m up from the bottom of the ladder (this distance goes along the ladder, it is not the vertical height). Assume that the ladder's weight acts at the ladder's center, and neglect the hose's weight. What is the minimum value for the coefficient of static friction between the ladder and the ground, so that the ladder (with the fireman on it) does not slip? (Assume = 54.0°.)
Answer: In order for the ladder (with the firefighter on it) to not slip against the ground, the friction between the ladder and the ground must provide enough horizontal force to prevent the ladder from sliding horizontally. The minimum value of the coefficient of static friction between the ladder and the ground can be calculated using the following steps:
Step 1: Identify the forces acting on the ladder.
The forces acting on the ladder are the weight of the ladder (WL) acting downward at the center of the ladder, the weight of the firefighter (Wf) acting downward at a distance of 6.40 m up from the bottom of the ladder, the normal force (N) exerted by the ground acting perpendicular to the ground, and the frictional force (f) acting horizontally in the direction opposite to the potential sliding motion of the ladder.
Step 2: Write down the equations for force equilibrium.
In the vertical direction, the sum of the vertical forces must be zero:
N + Wf - WL = 0
In the horizontal direction, the sum of the horizontal forces must be zero:
f = 0 (since there is no horizontal acceleration)
Step 3: Express the forces in terms of known quantities.
WL = 350 N (given)
Wf = 885 N (given)
The angle of inclination of the ladder with respect to the ground is given as 54.0°.
Step 4: Calculate the normal force N.
Using the vertical force equilibrium equation, we can solve for N:
N = WL - Wf = 350 N - 885 N = -535 N (negative sign indicates that N acts in the opposite direction of WL and Wf)
Step 5: Calculate the frictional force f.
Since the ladder is on the verge of slipping, the frictional force f will be at its maximum value, which is given by:
f = μN, where μ is the coefficient of static friction.
Step 6: Calculate the coefficient of static friction μ.
Using the calculated value of N, we can now calculate μ:
μ = f / N = (-535 N) / N = -535
Step 7: Determine the minimum value of μ.
The coefficient of static friction cannot be negative, as it is always non-negative in reality. Therefore, the minimum value of the coefficient of static friction between the ladder and the ground is 0, which means that the ladder must have sufficient friction with the ground to prevent slipping.
In conclusion, the minimum value for the coefficient of static friction between the ladder and the ground, so that the ladder (with the firefighter on it) does not slip, is 0.
suppose you measure the recession velocity (the speed at which any object is moving away from us) of galaxy a to be 1000 km/s and the recession velocity of galaxy b to be 6000 km/s. what can you conclude about the relative distances of these two galaxies?
We can conclude that Galaxy B is farther away from us than Galaxy A. Galaxy B is about 6 times farther away than Galaxy A.
The recession velocity of a galaxy is proportional to its distance from us, according to Hubble's Law. Specifically, the recession velocity v is given by:
v = H*d
where,
H = Hubble constant, which represents the rate of expansion of the universe
d = distance of the galaxy.
Assuming a value of H = 70 km/s/Mpc (which is a commonly used value), we can use the recession velocities of galaxies A and B to compare their distances from us.
If galaxy A has a recession velocity of 1000 km/s, its distance from us can be calculated as:
dA = vA / H = 1000 km/s / 70 km/s/Mpc ≈ 14.3 Mpc
Similarly, if galaxy B has a recession velocity of 6000 km/s, its distance from us can be calculated as:
dB = vB / H = 6000 km/s / 70 km/s/Mpc ≈ 85.7 Mpc
Therefore, we can conclude that Galaxy B is farther away from us than Galaxy A. In fact, galaxy B is about 6 times farther away than galaxy A.
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what are the two components of an electromagnetic wave?
The two components of an electromagnetic wave are the electric field and the magnetic field.
These two fields are perpendicular to each other and to the direction of the wave's propagation. The electric field is responsible for the wave's ability to carry energy, while the magnetic field is responsible for the wave's ability to interact with other magnetic fields.
In mathematical terms, the electric field is represented by the symbol E and the magnetic field is represented by the symbol B. Both fields oscillate in a sinusoidal manner, with the electric field oscillating in one plane and the magnetic field oscillating in a plane that is perpendicular to the electric field. These oscillations produce the characteristic waveform of an electromagnetic wave.
In summary, the two components of an electromagnetic wave are:
- The electric field (E)
- The magnetic field (B)
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if a quasar has a red shift of 0.98, then it is receding from earth at 98 percent the speed of light.
T/F
If a quasar has a red shift of 0.98, then it is receding from earth at 98 percent the speed of light. The statement is true.
The redshift of a celestial object, such as a quasar, provides information about its motion relative to an observer (in this case, Earth) and the expansion of the universe. The redshift is defined as the shift of light towards longer wavelengths, and it can be quantified using the parameter "z." The relationship between the redshift and the recessional velocity of an object is given by Hubble's law. According to Hubble's law, the recessional velocity is directly proportional to the redshift and the speed of light. Mathematically, it can be expressed as v = cz, where v is the recessional velocity, c is the speed of light, and z is the redshift.
Given a redshift of 0.98, we can calculate the recessional velocity using Hubble's law. Since the redshift represents the fractional increase in wavelength, a redshift of 0.98 corresponds to the light being stretched by 98 percent. Consequently, the recessional velocity is calculated to be approximately 98 percent of the speed of light. Therefore, if a quasar has a redshift of 0.98, it indicates that it is receding from Earth at a velocity equal to 98 percent of the speed of light, as determined by Hubble's law and the relationship between redshift and recessional velocity in an expanding universe.
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What 2 factors impact gravitational pull?
mass and distance
matter and energy
size and shape
speed and direction
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them
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Acceleration Due to Gravity - Free Fall
V=V;+gt
vir initial velocity (m/s)
=final velocity (m/s)
g=gravity (10 m/s2)
t = time (s)
1. What is the velocity of a dropped object after it has fallen
downward for 3.0s?
V=V;+gt
Vi = 0
8 = 10
t = 3
2. A brick is thrown down off a bridge with a velocity of 5 m/s. What
is its velocity after it has fallen for 2 seconds?
I
3. An arrow is launched straight up from the ground. It reaches its
highest point in 6 s. What velocity was it released at?
a b c d
A V=V+gt
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what is relative density?