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Q. By what percent must one increase the tension in a guitar string to change the speed of waves on the string from 327 m/s to 376 m/s?
Q. Calculate the gravitational potential energy of a 72 kg mass on the surface of the Earth.
Calculate the gravitational potential energy at an altitude of 16 km.
Take the difference between the results for parts (b) and (a), and then compare with mgh, where h = 16 km.
An archer pulls her bow string back 0.40m by exerting a force that increases uniformly from zero to 25 N. How much work does the archer do in pulling back the bow.
The magnitude of the acceleration due to gravity
An observer on the ground watches the boy throw the can and catch it. In this observer's ground frame of reference, explain the shape of can's path and determine the initial velocity of the can.
Janet jumps off a high diving platform with a horizontal velocity of 1.55 m/s and lands in the water 1s later. How high is the platform? The acceleration of gravity is 9.80 m/s2.
A flywheel in a motor is spinning at 560 when a power failure suddenly occurs. The flywheel has mass 40.0 and diameter 75.0. The power is off for 34.0, and during this time the flywheel slows down uniformly due to friction in its axle bearings. Durin..
Use the simulation in the cannon interactive in this section to answer the following questions. (a) Does cannonball's horizontal velocity change as it moves through the air? (b) Does its vertical velocity change? (c) If you enhance the cannonball's h..
Classically, the electron cannot pass through the barrier because E
An elastic cord is 66 cm long when a weight of 66 N hangs from it but is 86 cm long when a weight of 76 N hangs from it. What is the "spring" constant k of the elastic cord.
If the football has a mass of 0.47kg and the time of contact with the ball is 0.021s, what is the force exerted by the ball on the kicker's foot.
If you had a single polarizer, how might you determine whether or not light from a room light was polarized when emitted from the bulb.
What is the speed of the water leaving the nozzle
What is acceleration of the elevator
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