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A Ball of mass 4kg starting from rest rolls down from a height of 5m to the ground level. HInt: PE = mgh, KE = 1/2 mv^2 Use the law of conservation. Please show the work.
a. What is the speed of the ball at the ground level?
b. An the friction between the ball and the surface is negligible.
A car crashes into a wall at 25 m/s and its contents are brought to rest in 0.1s. display that the average force exerted on a 75-kg test dummy by the seat belt is more than 18,000 N.
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A rocket is fired at a speed of 82.0 m/s from ground level, at an angle of 31.0 ° above the horizontal. find By how much does the rocket clear the top of the wall
The intensity level produced by a jet airplane at a certain location is 163 dB. Calculate the intensity of the sound wave generated by the jet at the given location.
A 2.00 m brass rod with a 1.00 mm diameter is used as a spring by stretching the rod. If the tensile modulus of brass is 9.10 1010 N/m2, then the spring constant of the rod is
A car of mass 1490 kg rests on a hydraulic lift with a piston of radius 0.26 m that is connected to a second piston of radius 0.031 m. what is the force at the second piston
A glass optical fiber (n= 1.50) is submerged inwater(n=1.33). What is the critical angle for light to stay inside the fiber
A dipole is centered at the origin and has charges q and -q located at z=l/2 and z=-l/2, respectively. Find the electric field at position r along the z axis and also at position r along the x-axis
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. Estimate the net rate at which your body loses energy by radiation to the night sky under these conditions
A person does 100 joules of work of pulling back the string of the bow. What will be the original speed of a 0.5 killogram arrow when it's fired from the bow.
The world record for a high jump from a standing position is 1.90 m. With what speed must a jumper leave the ground to the attain this height
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