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Questions:
TimeLeft: Posted: 
Physics
Consider two uniform solid spheres where one has twice the mass and twice the diameter of the other. The ratio of the larger moment of inertia to that more... 
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Oct 22nd 
A bicycle is moving 4.0 m/s. What is the angular speed of a wheel if its radius is 30.0 cm?
(a) 4.8 rad/s
(b) 7.6 rad/s
more... 
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Oct 22nd 
A wheel of diameter 0.70 m rolls without slipping. A point at the top of the wheel moves with a tangential speed of 2.0 m/s. (a) At what speed is the more... 
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Oct 22nd 
Europa, a moon of Jupiter, has an orbital diameter of 1.34 x 10^9 m, and a period of 3.55 days. What is the mass of Jupiter? more... 
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Oct 22nd 
In space a 4.0 kg metal ball moving 30.0 m/s has a headon collision with a stationary 1.0 kg ball. After their perfectly elastic collision, what are more... 
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Oct 22nd 
A girl hits a stationary 200.0 gram ball and it leaves the racket at 40.0 m/s. If time lapse photography shows that the ball was in contact with the r more... 
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Oct 22nd 
Water flows over a waterfall 20.0 m high, at the rate of 4.0 x 10 ^4 kg/s. If the water powers an electric generator with a 40% efficiency, how many w more... 
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Oct 22nd 
In space there is nothing for a rocket to "push against," so how does it accelerate (answer first in terms of momentum and then in terms of more... 
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Oct 22nd 
If the net force on an object is zero, does the net torque on the object have to be zero? Why? more... 
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Oct 22nd 
Neglecting friction, find the acceleration (direction too) of the system for m1 = 0.25 kg, m2 = 0.50 kg, and m3 = 0.25 kg. more... 
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Oct 21st 
Water flows over a section of Niagara Falls at the rate of 1.0 106 kg/s and falls 48.0 m. How much power is generated by the falling water in Watts? more... 
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Oct 20th 
When an automobile moves with constant velocity, the power developed is used to overcome the frictional forces exerted by air and road. If the power d more... 
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Oct 20th 
A 95.0 N grocery cart is pushed 14.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are negl more... 
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Oct 20th 
An 80.0 N box of clothes is pulled 17.0 m up a 30.0° ramp by a force of 115 N that points along the ramp. If the coefficient of kinetic friction b more... 
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Oct 20th 
A 0.200 kg block on a vertical spring with a spring constant of 5.00 103 N/m is pushed downward, compressing the spring 0.100 m. When released, the b more... 
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Oct 20th 

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