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A husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 4.1L in the warm store at 72deg F. When he takes it outside, where the temperature is 54deg F, he finds it has shrunk. By how much has the volume decreased.
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
A skateboarder, starting from rest, rolls down a 12.5 m ramp. When she arrives at the bottom of the ramp her speed is 6.10 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. .m/s2 (b) If the ramp is inclined at 26.5° wit..
A box is at rest on a horizontal table. Is it because of the first law, second law, and or third law of motion that those two forces are equal
Solid cylindrical copper rod 0.2m long has one end maintained at temperature 20K, other end blackened and exposed to thermal radiation from surrounding walls at 500K. what is the temperature of the blackened end
The wheel in the figure below has eight equally spaced spokes and a radius of 30 cm. It is mounted on a fixed axle and is spinning at 2 rev/s. You want to shoot a 23 cm long arrow parallel to this axle and through the wheel without hitting any of the..
A student throws a baseball at a large gong 61 m away and hears the sound of the gong 1.5404 s later. The speed of sound in air is 330 m/s. What was the average speed of the baseball on its way to the gong
A car is traveling at 45.0 km/h on a flat highway. what is the minimum distance in which the car will stop
Suppose a muon produced as a result of a cosmic ray colliding with a nucleus in the upper atmosphere has a velocity v = 0.9500c. How far would it have traveled as observed on earth
A 54.00 kg pole vaulter running at 10 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
If we model the drag force of the atmosphere as proportional to the square of the speed of a falling object, Fdrag = ?bv^2, What is the person's terminal velocity
A potter's wheel of radius 0.26 m is turned on at t = 0 and accelerates uniformly. Find the angular acceleration and the total angular displacement of the wheel during this time
A 80 bike racer climbs a 1500 -long section of road that has a slope of 4.3 degrees. By how much does his gravitational potential energy change during this climb
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