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A roller coaster car goes over a hill at a constant speed of12.0m/s. (a) what radius should the hill have in order for the rider in the car to feel weightless at the top of the hill?. (b)How fast should the linear speed of the roller coaster car be in order for the rider to feel two times their weight at the bottom of a dip of radius, 30.0m?
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.0 V when it is delivering 22.0 W of power to an external load resistor R.
A car traveling at 30m/s overtakes another car only going 25m/s. When the faster car is still behind the slower car, it sounds a horn of frequency 1500Hz. What is the frequency heard by the driver in the slower car?
When a battery is connected to a 89.0-? resistor, the current is 3.91 A. When the same battery is connected to a 417.0-? resistor, the current is 0.848 A. Find the emf supplied by the battery
Two billiard balls have velocities of 1.50 m/s and -1.0 m/swhen they meet in an elastic head-on collision. What is the final velocity of the first ball after collision
A small, 10.0 g insect stand at one end of a thin uniform metal rod which is initially at rest on a frictionless horizontal table. What is the resulting angular speed of the rod
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 21.0 m/s. How long after being released does the stone strike the beach below the cliff
a -N block hangs from the second spring. A block of unknown weight hangs from the third spring. find the weight of the block hanging from the third spring
A 1408.0 g mass is on a horizontal surface with ?k = 0.39, and is in contact with a massless spring with a force constant of 526.0 N/m which is compressed. Calculate the distance the spring was compressed
Suppose molecules of an ideal gas are escaping by effusion through a small hole in a wall of an enclosure maintained at temp T. Calculate the mean kinetic energy of a molecule in the effusion beam Ue
A spherical shell has an outside radius of 2.45 cm and an inside radius of a. The shell wall has uniform thickness and is made of a material with density 4.74 g/cm3. What is this maximum mass
Three identical freight cars are sitting on the tracks, each separated by a small distance. A fourth car is coasting with velocity 4 m/s. How fast are the four cars moving
describe schematically the equipotential surfaces corresponding toa a constant electric field in the z-directionb a
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