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A rock is dropped off a 200m cliff. What is the velocity of the rock at a height of 30m?( we are currently studying the conservation of energy)
A baby elephant is fixed in a mud hole. To help pull it out game keepers use a rope to apply a force A as part a. By itself, though, force A is insufficient.
A ping pong ball of mass 100 grams travelling at 10 m/s hits a stationary bowling ball of mass 3 kg, head on. determine the final velocities of both balls
You're an optometrist, mounting a projector at the back of your 4.2m -long exam room, 2.6m above the floor. At what height should you center the pattern on the wall
A 0.42 kg ball is dropped from rest at a point 1.30m above the floor. The ball rebounds straight upward to a height of 0.580 m. What are the magnitude and direction of impulse of the net force applied to the ball during the collision with the floo..
The tangential speed of a particle on a rotating wheel is 3.5m/s. how long will the particle take to make one revolution
A steel section of the Alaskan pipeline had a length of 55.5 m and a temperature of 19.0 deg C when it was installed. What is its change in length
Two large metal plates are parallel to each other and separated by 2 cm. they are connected to a 120 V battery. What is the speed of the electron just before it hits the positive plate
describe how an electric current is generated and transported. assess the current state of our national grid in the
Transformer 1 has a primary voltage and a secondary voltage . Transformer 2 has twice the number of turns on both its primary, If the primary voltage on transformer 2 is , what is its secondary voltage
A hot-air balloonist, rising vertically with a constant velocity of magnitude = 5.00m/s , releases a sandbag at an instant when the balloon is a height = 40.0m above the ground, With what magnitude of velocity does it strike
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.41 cm. If the spring constant is 264 N/m, Determine the maximum speed of the mass
You sing into a well and find that the well resonates at frequencies of 231 Hz and 273 Hz with no resonances between these two frequencies. What is the frequency of the fundamental mode
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