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a solid, uniform sphere (r=20 cm, density= 850 kg/m cubed) is attached by a massless cable to the ceiling of a room, but it is also sitting at rest on a kitchen scale. using a free body diagram and newton's laws, find the apparent weight (the reading on the scale) when the cable tension is
a) 150 N and
b) 0 N
how much time passes before the police car overtakes the speeder after the speeder passes (assumed moving at constant speed).
A 1.5m -long barbell has a 22kg weight on its left end and a 35kg weight on its right end. If you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity
Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, For what value of q/Q>0.5 will the electrostatic force between the two parts have 1/2 of the maximum possible value
After the collision (assumed elastic), the second ball is moving along the positive y axis. Elucidate the final direction of the first ball, and what are their two speeds?
you need to store 25J of energy in the magnetic field of a solenoid. The solenoid hass 100 circular turns of diameter 5.0cm, What is the energy density inside the solenoid
A lightbulb has a resistance of 13? and consumes 9.4W of power; the rod is 1.33m long and moves to the left with a constant speed. what is the speed of the rod
a 56kg student runs at 5.0 m/s, grabs a hanging rope, and swings out over a lake (as shown). He releases the rope when his velocity is zero, draw the FBD of the student on the rope
A shotgun fires a large number of pellets upward, with some pellets traveling very nearly vertically and others as much as 1.0o from the vertical. suppose that the initial speed of the pellets is uniformly 150ms-1 and ignore air resistance.
A 100-kg halfback running north with a speed of 12 m/s is tackled by a 110-kg opponent running south with a speed of 4.0 m/s. If collision is completely inelastic and head-on, compute the speed of the players just after the tackle.
a plucked guitar string produces a sound wave of frequency 0.44 kHz on a day when the speed of sound is 340m/s. What is the wavelength of the sound wave
A lightweight electric car is powered by ten 12-V batteries, What must be the power of the electric motor if the car is to travel at a speed of 90 km/h
A golfer drives a 0.046kg golf ball from an elevated tee, giving the ball an initial horizontal velocity of 45 m/s. (a) what is the magnitude of the average force exerted by the club on the ball if the contact time for the golf club on the ball du..
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