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A 54-kg skater initially at rest throws a 3.0-kg medicine ball horizontally to the left. Suppose the ball is accelerated through a distance of 2.0 m before leaving the skater's hand at a speed of 7.0m/s . Assume the skater and the ball to be point-like, the surface to be frictionless, and ignore air resistance. Use a vertical y-axis with the positive direction pointing up, and a horizontal x-axis with the positive direction pointing to the right. Determine the acceleration of the ball during the throw. Determine the acceleration of the skater during the throw.
illustrate what force should the second crewman pull so that the net force of the two crewman is in the forward direction?
Two waves traveling on a string in the same direction both have a frequency of 125 Hz, What is the amplitude of the resultant wave if the original waves differ in phase by each of the following values
A horse canters away from its trainer in a straight line, moving 150m away in 14 sec. It then turns abruptly and gallops halfway back in 4.5 sec.
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
A drinking fountain shoots water about 14 cm up in the air from a nozzle of diameter 0.60 cm. What gauge pressure does the pump have to provide
A neutron star is the remnant left after certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 in diameter and have around the same mass as our sun. What is a typical neutron star density in g/cm^3?
During 0.27 s, a wheel rotates through an angle of 2.20 rad as a point on the periphery of the wheel moves with a constant speed of 2.69 m/s
The turbines in a hydroelectric plant are fed by water falling from a 50-m height, what is the mass flowrate of water required to power a 200-watt light bulb
While you are sitting on a chair at the edge of a 1.8 m deep swimming pool, your eyes are 1.7 m above the surface of the water. What is the horizontal distance between you and the acorn?
An ideal monatomic gas initially has temperature Ti and pressure pi. It is to expand from volume Vi to volume Vf. If the expansion is isothermal, what are the final pressure and the work done by the gas
In general, for a concave mirror with a focal length +f, how far should an object be placed from the mirror to form a real image which is neither enlarged nor reduced(enter your answer as a multiple of f)?
When the centrifuge reaches an angular speed of 2.5 rad/s, the trainee experiences a total acceleration equal to 4.8 times the acceleration due to gravity. Explain how long is the arm of the centrifuge?
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