To find:Final speed of the dingo, vUsing the formula of motion with uniform acceleration. The final speed of the dingo is 7.2 m/s.
The given parameters are:Initial speed of the dingo, u = 1.2 m/sDistance covered by the dingo, s = 34 mAcceleration of the dingo, a = 1.8 m/s²To find:Final speed of the dingo, vUsing the formula of motion with uniform acceleration,
The given values in the above equation:v² = (1.2 m/s)² + 2 × 1.8 m/s² × 34 mv² = 1.44 m²/s² + 122.4 m²/s²v² = 123.84 m²/s²Now, taking the square root on both sides, we get:v = sqrt(123.84) m/sv ≈ 11.13 m/sSo, the final speed of the dingo is 11.13 m/s.
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1. You released a pendulum of mass 1kg from a height of 0.05m
b. If the pendulum loses 18% of the initial energy by the time it reaches the bottom, how fast is it going when it reaches the bottom?
c. If the pendulum loses another 7% of its remaining energy by the time it reaches the other side, how high up does it go?
d. After a few minutes the pendulum is no longer swinging at all, explain why this happens in terms of energy?
a. The speed of the pendulum when it reaches the bottom is 0.9 m/s.
b. The height reached by the pendulum is 0.038 m.
c. When the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
Kinetic energy of the pendulum when it reaches bottomK.E = 100%P.E - 18%P.E
where;
P.E is potential; energyK.E(bottom) = 0.82P.E
K.E(bottom) = 0.82(mgh)
K.E(bottom) = 0.82(1 x 9.8 x 0.05) = 0.402 J
Speed of the pendulumK.E = ¹/₂mv²
2K.E = mv²
v² = (2K.E)/m
v² = (2 x 0.402)/1
v² = 0.804
v = √0.804
v = 0.9 m/s
Final potential energyP.E = 100%K.E - 7%K.E
P.E = 93%K.E
P.E = 0.93(0.402 J)
P.E = 0.374 J
Height reached by the pendulumP.E = mgh
h = P.E/mg
h = (0.374)/(1 x 9.8)
h = 0.038 m
when the pendulum stopsWhen the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
Thus, the speed of the pendulum when it reaches the bottom is 0.9 m/s.
The height reached by the pendulum is 0.038 m.
When the pendulum no longer swing at all, all the kinetic energy of the pendulum has been used to overcome frictional force.
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draw a burette filled with water to a volume of 28 cm cubic
A burette filled with water to a volume of 28 cm cubic is represented as a long cylindrical tube with a narrow neck, a stopcock, and a water level at 28 cm.
A burette is a laboratory equipment that is used to measure the volume of a liquid with a high degree of accuracy. It is usually made of glass and has a long, cylindrical shape with a narrow neck and a stopcock at the bottom.
The burette is commonly used in chemistry experiments, particularly in titrations, to measure the volume of a liquid that is being added to a solution.
To draw a burette filled with water to a volume of 28 cm cubic, first, you will need to set up the burette on a stand. The burette should be clamped securely to the stand, and the stopcock should be closed to prevent any liquid from flowing out.
Next, you will need to fill the burette with water. To do this, you can use a funnel and slowly pour the water into the burette through the funnel. Make sure that there are no air bubbles in the burette and that the water level is below the zero mark on the burette.
To fill the burette to the desired volume of 28 cm cubic, you will need to slowly open the stopcock and let the water flow out until the water level reaches 28 cm cubic on the burette scale. It is important to take your time when filling the burette to ensure that you do not overshoot the desired volume.
Once you have filled the burette to the desired volume, you can close the stopcock to stop the flow of water. You should now have a burette filled with water to a volume of 28 cm cubic. Remember to record the volume measurement accurately to ensure the accuracy of your experiment.
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What type of glass is heat resistant?
A.leaded glass
B.tinted glass
C.borosilicate glass
D.tempered glass
Answer:
D.
Explanation:
Tempered glass is the less expensive alternative, and is best for lower temperature applications. It can withstand constant temperatures of up to 470 degrees F. Tempered glass is regular glass that has been strengthened through a thermal or chemical treatment. Tempering not only strengthens the glass but also changes its breakage pattern, causing it to shatter into small pieces instead of large sharp angles, reducing the chance of injury. It is best used for applications where the fire will not be near the glass, as constant temperatures of 500 degrees or more will cause it to weaken and shatter.
which of the following is the safest use of a life jacket or pfd?
The safest use of a life jacket or PFD (personal flotation device) is to wear it at all times when in or near water, especially when boating or swimming.
It should be properly fitted and adjusted to ensure a snug and comfortable fit. It is also important to choose the appropriate type of life jacket or PFD for the activity and water conditions.
It is recommended to always check the manufacturer's instructions for proper use and maintenance of the device. Additionally, it is important to regularly inspect and replace a life jacket or PFD if it shows signs of wear and tear or damage.
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From a height of 20 meters, a stone is thrown downwards at 15 m/s. How long it take the stone to hit the ground?
PLEASE I NEED HELP
Best answer gets BRAINLIEST
A 3.23kg book falls off the top of a 3.01 m bookshelf. What is its kinetic energy right before it hits the ground? ( g= −9.81m/s2 )
Show work please
Answer:
K= 95.4 J
Explanation:
For this exercise we must use the conservation of mechanical energy.
We set a reference system on the floor.
Starting point. Higher
Em₀ = U = m g h
Final point. Just before taking the floor
Em_f = K = ½ m v²
energy is conserved because there is no friction
Em₀ = Em_f
mg h = K
The height is
h = y -y₀h = 0- y₀
let's calculate
K = 3.23 (-9.81) (-3.01)
K= 95.4 J
1. Work = ………………x……………………….
2. ……………….energy is obtained from loudspeakers, while ………….is obtained from solar cells.
3. The energy produced from burning of wood is …………energy, while energy stored in a stretched spring is
……………… energy.
4. The factors that affect potential energy are …………….. and …………….
5. Mass is determined by…………unit, while the weight is determined by …………..unit.
Answer:
1.
2sound,solar energy
3.heat energy
When you are sitting in a chair, your body exerts a _____
on the chair and the chair exerts the ____ force back.
it can either be:
force
friction
same
different
interacting objects
mass
or push
Research about how to find the volume of three-dimensional symmetrical shape by integration. 4:19 AM Design any three-dimensional symmetrical solid. ( with cavity in it) 4:19 AM take the flat side(R) of one of the 3-D symmetrical shape (that you designed) and place it against a coordinate plane. Determine this flat will be revolving around which axis. 4:19 AM Find the volume for the 3-D symmetrical shape (show your work) 4:19 AM
To find the volume of a three-dimensional symmetrical shape using integration, we can use the method of cylindrical shells. This method involves dividing the shape into thin cylindrical shells and then integrating their volumes.
Let's say we have designed a symmetrical solid in the shape of a sphere with a cylindrical cavity running through its center. We will place the flat side (R) of the sphere against the x-y plane. The sphere will be revolving around the z-axis since it is symmetrical about that axis.
To find the volume, we first need to determine the equations for the sphere and the cavity.
The equation for a sphere centered at the origin with radius R is:
x^2 + y^2 + z^2 = R^2
The equation for the cylindrical cavity with radius r and height h is:
x^2 + y^2 = r^2, -h/2 ≤ z ≤ h/2
The volume of the solid can be found by subtracting the volume of the cavity from the volume of the sphere. Using the method of cylindrical shells, the volume of each shell can be calculated as follows:
dV = 2πrh * dr
where r is the distance from the axis of rotation (the z-axis), and h is the height of the shell.
Integrating this expression over the appropriate range of r gives the total volume:
V = ∫[r1, r2] 2πrh * dr
where r1 and r2 are the radii of the cavity and the sphere, respectively.
Substituting the expressions for r and h, we get:
V = ∫[-h/2, h/2] 2π(R^2 - z^2) dz - ∫[-h/2, h/2] 2π(r^2 - z^2) dz
Simplifying and evaluating the integrals, we get:
V = π(R^2h - (1/3)h^3) - π(r^2h - (1/3)h^3)
V = πh( R^2 - r^2 ) - (1/3)πh^3
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Which of the following is a base?
A. Lemon Juice
B. Baking Soda
C. Vinegar
1. A 20 kg cart is sliding along a level, frictionless table at 4 m/s. A small box moving in the same
direction as the cart falls into the cart. What is the total momentum of the cart and box system?
A. 80 kg.m/s plus the momentum from the small box
B. 80 kg.m/s total
C. 80 kg.m/s minus the momentum from the small box
Answer:
B. 80 kg m/s total
40 time 20
How much time does a car with an acceleration of 2 m/s2 take to go from 10 m/s to 30 m/s?
Answer: 10 seconds for the car to go from a velocity of 10 m/s to 30 m/s with an acceleration of 2 m/s^2.
Explanation:
To calculate the time it takes for a car with an acceleration of 2 m/s^2 to go from a velocity of 10 m/s to a velocity of 30 m/s, we can use the equation:
time = (final velocity - initial velocity) / acceleration
In this case:
time = (30 m/s - 10 m/s) / 2 m/s^2
time = 20 m/s / 2 m/s^2
time = 10 s
Therefore, it takes 10 seconds for the car to go from a velocity of 10 m/s to 30 m/s with an acceleration of 2 m/s^2.
Discuss the magnitude of relative internal resistances of an ammeter and a voltmeter. Which meter is connected in series? in parallel? Explain.
The internal resistance of ammeter is zero and voltmeter is infinite and, ammeter is connected in series and the voltmeter is in parallel.
To find the answer, we have to study about the internal resistance.
What is the internal resistance of an ammeter and voltmeter?A circuit has a parallel connection for the voltmeter and a series connection for the ammeter. An ammeter is used to calculate the amount of current flowing through a circuit. The value of the potential difference or voltage across the load is measured using a voltmeter (resistor). The voltage reading on the voltmeter represents the amount of energy that each unit of charge has transmitted to the component. An ideal ammeter should have zero internal resistance since it should permit current to flow through it. To measure the current flowing through a circuit, an ammeter is connected in series with the circuit. Since the internal resistance of the ideal voltmeter should prevent any current from passing through it, it is infinite. Voltmeter measures the potential difference, it is connected in parallel.Thus, we can conclude that, the internal resistance of ammeter is zero and voltmeter is infinite and, ammeter is connected in series and the voltmeter is in parallel.
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Which of the following is a good example of a contact force? A. Earth revolving around the Sun B. a bridge suspended by cables C. a ball falling downward a few seconds after being thrown upward D. electrically charged hairs on your head repelling each other and standing up
Answer: a bridge suspended by cables
An electron, starting from rest and moving with a constant acceleration, travels 1.0 cm in 20 ms. What is the magnitude of this acceleration?
Answer:
s = 1/2 a t^2 distance vs acceleration
a = 2 * s / (2E-2)^2 = 2 * 1E-2 / 4E-4 = .5E2 = 50 m/s
5. Extend: On the SPACE tab, drag the axis to 0° (straight up and down). How does this affect
seasons on the EARTH tab?
Dragging the axis to 0° on the SPACE tab will result in no transitional seasons, and the entire Northern Hemisphere will experience either continuous daylight (summer) or continuous darkness (winter), depending on the time of year.
When you drag the axis on the SPACE tab to 0°, it aligns the Earth's rotational axis perpendicular to the plane of its orbit around the sun. This means that the Earth's North Pole is pointing directly towards the sun, and the South Pole is pointing away from it.
On the EARTH tab, this change in the orientation of the Earth's axis will affect the seasons in the following ways
The summer solstice occurs around June 21st in the Northern Hemisphere when the North Pole is tilted towards the sun. However, when you drag the axis to 0°, the North Pole is pointing directly towards the sun, so the entire Northern Hemisphere experiences continuous daylight, and it is summer everywhere in the Northern Hemisphere.
The winter solstice occurs around December 21st in the Northern Hemisphere when the North Pole is tilted away from the sun. However, when you drag the axis to 0°, the North Pole is pointing directly away from the sun, so the entire Northern Hemisphere experiences continuous darkness, and it is winter everywhere in the Northern Hemisphere.
The equinoxes occur around March 21st and September 21st in the Northern Hemisphere when the axis is neither tilted towards nor away from the sun. However, when you drag the axis to 0°, the equinoxes do not occur, and there are no transitional seasons. It is either summer or winter everywhere on the Earth.
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9. How are ecological footprints useful?
Answer:
This is what the Ecological Footprint does: It measures the biologically productive area needed to provide for everything that people demand from nature: fruits and vegetables, meat, fish, wood, cotton and other fibres, as well as absorption of carbon dioxide from fossil fuel burning and space for buildings and roads.
Why it's useful:
Ecological footprint (EF), measure of the demands made by a person or group of people on global natural resources. It has become one of the most widely used measures of humanity’s effect upon the environment and has been used to highlight both the apparent unsustainability of current practices and the inequalities in resource consumption between and within countries.
A military aircraft accelerates from rest for 4.24 seconds to take off of an aircraft carrier along a 77.7-m runway. Determine the take-off speed of the plane.
The take-off speed of the plane as it accelerate from rest is 36.65 m/s.
What is speed?Speed can be defined as the ratio of distance to time.
To calculate the the take-off speed of the plane, we use the formula below.
Formula:
S = (u+v)t/2........ Equation 1Make v the subject of the equation
v = (2S/t)-u......... Equation 2Where:
S = Distancev = take-off Speedt = timeu = Initial speedFrom the question,
Given:
S = 77.7 mt = 4.24 secondsu = 0 m/s (From rest)Substitute these values into equation 1
v = (2×77.7)/(4.24)v = 36.65 m/sHence the take off speed of the plane is 36.65 m/s.
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The plot of displacement versus time is a straight line that starts at (0,0) and ends at (6,4). What is the velocity for this time interval if time is measured in seconds and displacement in meters?
0.67 m/s is the velocity for this time interval if time is measured in seconds and displacement in meters.
A vector number called velocity is used to characterise an object's speed in a certain direction. A magnitude and a direction serve as its representation. The pace at which an object's position changes over time is measured by velocity. Velocity is measured in metres per second (m/s), the SI unit. By dividing the distance travelled by the time needed to traverse that distance, the average velocity of an object is determined. Velocity can be zero, negative, or positive. An object is travelling in the right direction when its velocity is positive.
velocity = rise / run
= (4 - 0) / (6 - 0)
= 0.67 m/s
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Describe the difference between the terms rotation and revolution:
include day/night, year and
seasons in your explanation.
Rotation refers to the spinning motion of an object around its own axis, while revolution refers to the orbiting motion of an object around another object.
In the case of the Earth, rotation causes day and night. As the Earth rotates on its axis, different parts of it face the sun at different times, causing the alternating cycle of day and night. One complete rotation of the Earth on its axis takes 24 hours or one day. On the other hand, revolution is responsible for the length of the year. As the Earth revolves around the sun in an elliptical orbit, it takes one complete revolution to complete a year. This takes approximately 365.25 days, which is why we have a leap year every four years. The seasons are also a result of the Earth's revolution around the sun. The tilt of the Earth's axis causes the different hemispheres to receive different amounts of sunlight during different parts of the year, leading to the four seasons. For example, when the northern hemisphere is tilted towards the sun, it receives more direct sunlight, leading to summer. When the northern hemisphere is tilted away from the sun, it receives less direct sunlight, leading to winter. In conclusion, while rotation and revolution may seem similar, they have distinct differences that impact our daily lives and the workings of the universe. Rotation causes day and night, while revolution determines the length of the year and the seasons.
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A horse gallops a distance of 60 m and 15 seconds. Then, he stops to eat some grass for 20 seconds. Next, he trots for 25 seconds over 60 m. The horse trots in the same direction he galloped. Finally the horse races back home (back to it starting position) traveling 120 m in 20 seconds.
Calculate the horses average speed for the entire journey.
Please do a Step By Step!
Explanation:
120+ 120 = 240 miles divided 1 hours 20 seconds
1. Calculate the momentum of each car before the collision: SHOW YOUR WORK!
Pred p = mxv> (1 kg) x (+5) = +5 kg m/s
Pblue: P = mxv
(1 kg) x (0) = 0 kg m/s
Answer:
Momentum of red car = 5kgm/s
Momentum of blue car = 0kgm/s
Explanation:
Momentum = mass × velocity
For the red car
Mass = 1kg
Velocity = 5m/s
Momentum of the red car = 1kg × 5m/s
Momentum of the red car = 5kgm/s
For the blue car.
Mass = 1kg
Velocity = 0m/s(shows that the blue car is stationery)
Momentum = 1kg ×0m/s
Momentum of the blue car = 0kgm/s
How much work is done when a force of 33 N pulls a wagon 13 meters?
*Round your answer to the nearest whole number.
Answer:
Work = (force) x (distance)
Work = (33N) x (13m) = 429 N-m = 429 joules
IF the force is in exactly the same direction as the motion of the wagon.
Explanation:
pa mark ng brainliest
Write out the correct chemical formula for magnesium phosphide.
Answer: Magnesium is mgp32
Explanation:
Answer: Mg3P2 is the correct chemical formula.
Find the angle between v and w. Round your answer to one decimal place, if necessary. v=4i+2j,w=8i−6j A. 73.4 ∘
B. 63.4 ∘
C. 21.7 ∘
D. 31.7 ∘
The given vectors are v = 4i + 2j and w = 8i - 6j. Let's find the angle between them. We know that the dot product of two vectors is equal to the product of their magnitudes and the cosine of the angle between them. The formula for the dot product is: v . w = |v| |w| cos θ
Here, |v| and |w| are the magnitudes of v and w, respectively, and θ is the angle between them. Let's calculate the dot product:
v . w = (4i + 2j) . (8i - 6j)
= 32i^2 - 12j^2
= 32 - 12
= 20
The magnitudes of v and w are:
|v| = sqrt(4^2 + 2^2) = sqrt(20)
|w| = sqrt(8^2 + (-6)^2) = sqrt(100) = 10
Substituting these values in the dot product formula, we get:
20 = sqrt(20) x 10 x cos θ
Dividing both sides by sqrt(20) x 10, we have:
cos θ = 20 / (sqrt(20) x 10)
cos θ = 1 / (sqrt(20) / 10)
cos θ = 1 / sqrt(2)
cos θ = sqrt(2) / 2
Now, we know that cos 45° = sqrt(2) / 2
Therefore, the angle between v and w is 45°.
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If there are 20 volts across a 4 ohms resistor, what is the current?
a) 10 A b) 80 A
c) 20 A d) 5 A
If there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.
What is the significance of Ohm's law?It is significant for the understanding of the current and related fields, it can be used to predict the behavior of electrical circuits, it is helpful to design circuits, it gives knowledge of energy efficiency in electrical systems, and it helps in understanding the relationship between voltage, current, and resistance in a circuit.
Hence, if there are 20 volts across a 4 ohm resistor, then the current is 5A (20/4), which is present in option D, as the current can be measured by Ohm's law and more current means less resistance and less current means there is more resistance.
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what is net netforce?
how much force does an 80 kg astronaut exert on his chair while sitting at rest on the launch pad? b. how much force does the astronaut exert on his chair while accelerating straight up at 10 m/s 2
The force exerted by the astronaut accelerating straight up with an acceleration of 10 m/s² is m/5 Newton.
A force equal to the product of the mass and the acceleration is required to move a body of mass "m" with acceleration "a."
7. 84.8 newtons, which implies that an astronaut sitting on a chair will exert force equal to the norm. The law will frequently be equivalent to 7. 84.8 newtons, so we can write and is equal to MTG 18 to 9.81.
We are informed that a cosmonaut is ascending vertically at an acceleration of 10 m/s2. Since the astronaut is moving upward, the resulting energy is also moving upward. Let's now suppose that the astronaut is pushing on the chair with a force of F[A]. Typically, the response force on the astronaut will also be same.
F[N] = F[A]
Now, we can write the resultant normal reaction force as:
ma - mg = F[N]
F[N] = m(a - g)
F[N] = m(10 - 9.8)
F[N] = m(0.2)
F[N] = m/5
F[A] = F[N] = m/5, where m is the mass of astronaut.
Therefore, the force exerted by the astronaut accelerating straight up with an acceleration of 10 m/s² is m/5 Newton.
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What must occur for neutral chargers to occur
A balloon is partially inflated and sealed. A number of weights are attached to the balloon such that it is neutrally buoyant when submerged at a certain depth in a beaker of water. Describe the motion of the balloon, if you push the balloon down to a greater depth and release it. Explain.
This motion of the balloon is an example of buoyancy, which is the upward force exerted by a fluid on an object immersed in it.
Example of buoyancy motionWhen the balloon is neutrally buoyant, it means that the weight of the balloon and the weights attached to it is equal to the weight of the water displaced by the balloon.
If you push the balloon down to a greater depth and then release it, the balloon will rise back up to its original position.
This is because the balloon is still partially inflated and contains air, which is less dense than water. When you push the balloon down, the water pressure compresses the air in the balloon, causing it to become smaller in size.
When you release the balloon, the compressed air expands and pushes the balloon upwards towards the surface of the water.
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