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A puck (mass m1 = 2.50 kg) slides on a frictionless table. The puck is tied to a string that runs through a hole in the table and is attached to a mass m2 = 7.5 kg. The mass m2 is initially at a height of h = 7.5 m above the floor with the puck traveling in a circle of radius r = 2.00 m with a speed of 7.5 m/s. The force of gravity then causes mass m2 to move downward a distance 0.75 m. What is the new speed of the puck? What is the change in the kinetic energy of the puck?
After falling from rest from a height of 29 m, a 0.49-kg ball rebounds upward, reaching a height of 19 m. find average force was exerted on the ball
Many communications satellites orbit the earth in geostationary orbits. (They appear to remain in the same positions in the sky for observers on the earth's surface.) If such a satellite orbits at a height of 40,000 km, estimation the time delay in a..
A battery has an internal resistance of 0.75 ohm and an emf of 9 V. It is placed a cross a 5 ohm resistor and a 10 uF capacitor hooked up in parallel. a) after the capacitor has charged, what is the current through the resistor? b) what is the charge..
The owner of a van installs a rear-window lens that has a focal length of -0.300 m. How far from the van is the object actually located
The elementary particle called a muon is unstable and decays after 2.20 ?s, as observed in its rest frame, What lifetime do you observe for the muon
A fictional spaceship accelerates at a constant rate of 0.108 m/s^2. How long would it take to reach the moon, 3.48 x 10^8 m away
High-speed stroboscopic photographs show that the head of a 190-g golf club is traveling at 58 m/s just before it strikes a 46-g golf ball at rest on a tee, Find the speed of the golf ball just after impact
Imagine that we drop a block of mass m from a height h above the comparatively lightweight plate supported by a vertical spring with relaxed length L and spring constant k. From what value of h would we have to drop the block to compress spring to..
A hydrogen atom, initially at rest, emits an ultraviolet photon with a wavelength of = 121 What is the recoil speed of the atom after emitting the photon
Gas in a cylinder similar to the one shown in the figure moves a piston with area 0.223 m2 as energy is slowly added to the system. find the displacement of the piston
A high-performance sports car can go from 0 to 100 mph in 7.8 s. (Assume the car travels in the positive direction. What is the car's average acceleration
The strength of the magnetic field within a solenoid is B = 3.4 × 10-2 T, single loop is placed in the solenoid parallel to the plane of each loop in the solenoid, What is the total number of turns of the solenoid
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