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A 400kg baby grand piano is raised to the roof of a 100m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics.
A child of mass 24 kg sits 2.10m to the left of the center of a seesaw. The mass of the seesaw is 35 kg. How far to the right of the central pivot must a second child of mass 40 kg sit if the seesaw is to be perfectly balanced.
An object is released from an aeroplane which is diving at an angle of 30 from the horizontal with a speed of 50m/s. If the plane is at a height of 4000m from the ground when the object is released, find the velocity of the object when it hits the gr..
q1. if 25grams of water at 100 degrees celsius are mixed with 15 grams of water at 40 degrees celsius what temperature
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal. How far does the jumper jump?
A spring with spring constant 12.5 hangs from the ceiling. A 400 ball is attached to the spring and allowed to come to rest. It is then pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57.0 ..
What is the minimal mass of helium (density 0.18) needed to lift a balloon carrying two people in a basket, if the total mass of people, basket, and balloon (but not gas) is 320.
A rocket fires two engines simultaneously. One produces a thrust of 615 directly forward while the other gives a thrust of 474 at an angle 39.6 above the forward direction.
Compute magnitude of the average emf
A toboggan approaches a snowy hill moving at 10.9 m/s. The coefficients of static and kinetic friction between the snow and the toboggan are 0.470 and 0.320, Find the acceleration of the toboggan as it is going up the hill
Because the mass would not make it around the loop if released from the height of the top of the loop (do you know why?) it should be released above the top of the loop-the-loop height.
A platform moves up and down in SHM, with amplitude 0.050 m. Resting on top of the platform is a block of wood. What is the shortest period of motion for the platform so that the block will remain in constant contact with it?
The electric field within the membrane separating the inside and outside of a biological cell is approximately 7.5 MV/m and is essentially uniform. what is the potential difference across the membrane
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