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A perfectly circular hoop of mass m = 6 kg and radius r = 0.4m rotate on a horizontal plane on a vertical axis passing through its center. At t = 0 the hoop rotates at a rate of 400 rpm but 12 s later it stops because of frictional torque. Assuming constant acceleration calculate.
a) The angular acceleration
b) The number of revolution the hoop did during this time
c) Total linear acceleration (only magnitude) of a bug seating at the edge of the hoop at t = 10s.
d) Frictional torque
In 4 to 5 billion years, the Sun is expected to enter a red giant phase, in which its outer layers will gradually expand out beyond Earth's present orbit. If the Sun's angular momentum is conserved as it expands, and its mass doesn't change, will its..
A boy pulls a 5.0 Kg sled 10.0 m along a horizontal surface at a constant speed. what work does he do pulling the sled
A tank having a volume of 0.100 m3 contains helium gas at 135 atm. How various balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.50 atm.
A bar of length 1.5 meters moves to the left at 4.6 m/s along a set of conducting rails. The rails and bar have a net resistance of 10 Ohms. Determine the induced electromotive force
The electric output of a power plant is 790MW. Cooling water flows through the power plant at the rate 0.600*10^8 L/hr. What is the power plant's thermal efficiency
There is strong evidence that the center of the Milky Way galaxy contains a giant black hole with a mass of perhaps one million Suns. find the maximum radius of a million-solar-mass black hole
a jogger travels a route that has two parts. the first is a displacement of 2.40 km due south and the second involves a
How much work does the electric field do in moving a proton from a point with a potential of +135V to a point where it is -70V? Express your answer in joules.
Two resistors, 42.0 ohm and 72.0 ohm are connected in parallel. The current through the second resistor is 4.30 Amp. Find what is the current in the first resistor
To develop muscle tone, a woman lifts a 4.50 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. How much work does she do
A very light rigid rod with a length of 1.32 m extends straight out from one end of a meter stick. The other end of the rod serves as a pivot and the system is set into oscillation
Express how unmet basic physiological needs of oxygen, nutrition, temperature, and humidity threaten clients' safety.
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