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A piano tuner hears a beat frequency of 6.2 Hz when comparing the piano's A-string against a reference tuning fork vibrating at 440 Hz. Assuming the piano strong has too low a pitch, what percent increase in tension is needed to bring the string into tune? You answer should be given to the nearest tenth of a percent.
There are 2 spaceships, A and B, that approach the earth from opposite directions. Now according to an observer on spaceship A,she approaches the earth at 0.7c. According to an observer onspaceship B, he approaches the earth at 0.85c.
A simple pendulum is made from a 0.55-m-long string and a small ball attached to its free end. how much time elapses before it attains its greatest speed
a straight wire is aligned north-south in a region where earths magnetic field barrowbold is directed 52.0deg above the
As two trains move along a track, their conductors suddenlynotice that they are headed toward each other. The figure givestheir velocities v as a function oftime t as the conductors slow the trains.
A 2.0-kg object is at rest at the top of an inclined plane that makes an angle of 30° with the horizontal and which has a rise of 0.40 m. How much work is done by the object in sliding down the inclined plane
20 g of helium are placed in a cylinder with a movable piston. What is the maximum temperature reached during the compression
a solid aluminum ingot weighs 92 n in air.a what is its volume?b the ingot is suspended from a rope and totally
The net work done in accelerating a propeller from rest to an angular speed of 135 rad/s is 1998.5 J. What is the moment of inertia of the propeller
A semi-trailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway truck ramp that is inclined at an angle of 15.0° above the horizontal. What was the truck's initial speed
A 109-rad dose of radiation is administered to a cancer patient (mass = 73) kg). how much energy is absorbed
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m. Its total mass including the instruments it carries is 10.0 kg. Find the buoyant force acting on the balloon
A particle has an acceleration of 6.19 m/s^2 for 0.350 s. What was the particle's initial velocity
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