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A 0.250 kg ball attached to a string s being swung in a vertical circle, like a roller coaster doing a loop-de-loop, with a radius of 1.15 m.
(a) What is the minimum speed at the top of the circle to keep the string from going slack? (At this speed, the tension in the spring is zero).
(b) If the speed of the ball increases by a factor of sqrt(5) in swinging to the bottom of the circle (v_bottom = sqrt(5) * v_top), what will be the tension in the spring at the bottom of the circle?
A small box of mass m1 is sitting on a board of mass m2 and length L . The board rests on a frictionless horizontal surface
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Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u03A9m. What is the electrical resistance of a copper wire with a radius of 1.0 mm and a length of 25 m
two point charges each have a value of 30.0 mC, compute the electric field midway between the two charges
A high-speed photograph of a club hitting a golf ball is shown in the figure below. find the average force exerted on the ball by the club
You wish to boil 1.1 kg of water, which has a specific heat capacity of 4186 J/kg-K. The water is initially at room temperature (293 K). Water boils at 373 K. How much energy must be added to the water by heating it in order for it to start boiling
The current in a 100 watt lightbulb is 0.720A. The filament inside the bulb is 0.240mm in diameter. What is the electron current in the filament
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What focal length objective lens is required for a 3 meter length telescope which uses a 4 Power eyepiece? Is the final image real
A woman on a bridge 104 m high sees a raft floating at a constant speed on the river below, She drops a stone from rest in an attempt to hit the raft, Find the speed of the raft
Take two containers, each with volume 0.1 m3, containing ideal gases of monatomic He at T= 104 K and diatomic N2 at T = 236 K, What is the change of dimensionless entropy solely due to the fact that the gases have more volume accessible
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