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Two astronauts of equal mass 70 kg are holding on to opposite ends of a straight rope in space. The length of the rope between them is 20 meters. They are rotating about an axis that passes through the center of mass midway between the two astronauts with angular velocity 1 radian/sec. One of the astronauts pulls on the rope, decreasing the distance separating them to 20/2 meters. (In the following, take the rope to be massless.)
a) What is the new angular velocity of the two astronauts?
b) How much work did the astronaut who pulled on the rope do?
Slamming on the brakes, a driver decelerates her car from 25.0 m/s to 15 m/s in 3.5 s. Find her average speed assuming the acceleration was unifrom.
Two blocks are connected by a very light string passing over a massless and frictionless pulley, Find the total work done on 20.0-N block if ?s=0.500 and ?k=0.325 between the table and the 20.0-N block
a 520 N physics student stands on a bathroom scale in an 850 kg(including student) elevator that is supported by a cable. find the acclereration of the elevator
A sinusoidal wave traveling on a string has a period of 0.21s, a wavelength of 32cm, and an amplitude of 5.0cm. compute the speed of this wave
A metal container, which has a mass of 8.8 kg contains 15.1 kg of water. A 2.4-kg piece of the same metal, initially at a temperature of 180.0°C, Calculate the specific heat of the metal
When a nerve impulse propagates along a nerve cell, find the magnitude of the change in charge density on the walls on the cell membrane
A rifle with a barrel length of 59 cm fires a 8 g bullet with a horizontal speed of 350 m/s, What resistive force (assumed to be constant) does the wood exert on the bullet
An inductor with an inductance of 3.00H and a resistance of 7.10? is connected to the terminals of a battery with an emf of 6.10V, Find the final steady-state current
A person whose mass is 72 kg sits on a piston of a hydraulic lift. The radius of this piston is 0.18 m, What is the mass of a puppy
An electron is then fired directly toward the center of the shell, from point P at distance r from the center of the shell (r >> R). What initial speed v0 is needed for the electron to just reach the shell before reversing direction.
Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2. find the magnitude of the contact force between the two blocks
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. How many grams of gold are deposited by this process
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