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Questions:
TimeLeft: Posted: 
Physics
A hypothetical planet has a radius 2.3 times that of earth, but has the same mass. What is the acceleration due to gravity near its surface? more... 
expired 
Oct 25th 
Tarzan plans to cross a gorge by swimming in an arc from a hanging vine(shown in the figure). If his arms are capable of exerting a force of 1800 N o more... 
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Oct 25th 
Estimate the force a person must exert on a string attached to a .11 kg ball to make the ball revolve in a horizontal circle of radius .6 m. The ball more... 
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Oct 25th 
On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. This satellite was injected into an orbit 705k more... 
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Oct 24th 
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 23rd 
A heavy man and a lightweight girl are balanced on a massless seesaw. If they both move forward so that they are onehalf their original distance from more... 
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Oct 22nd 
A potter's wheel with a moment of inertia of 8.0 kg m^2 has 5.0 N m applied to it. It starts from rest. 10.0 seconds later it has gained what k more... 
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Oct 22nd 
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... 
expired 
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... 
expired 
Oct 22nd 

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