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A geostationary communications satellite orbits the earth directly above the equator at an altitude of 34800. Calculate the time it takes for a signal to travel from a point on the equator to the satellite and back to the ground at another point on the equator exactly halfway around the earth.
Star formation appears to be promoted by sending shock waves through a dark cloud of the interstellar medium. Give two sources that can produce these shock waves.
A glass window 0.45cm thick measures 80cm by 37cm. To compare the relative efficiency of air and glass as insulators, calculate the heat flows through this window
radiation from the head is a major source of heat loss from the human body. model a head as a 20-cm-diameter 20-cm-tall
A meterstick moving at 0.931c relative to Earth approaches an observer at rest with respect to Earth. What is the meterstick's length, according to the observer
A baseball leaves the batter's bat at 30° above horizontal. With what speed does the ball leave the bat, What is the acceleration of the ball when it reaches maximum height
An object, 0.75 cm tall, is placed 12.0 cm to the left of a diverging lens (f = -8.00 cm). determine the focal length of the converging lens
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
On a frictionless horizontal air table, puck A (with mass 0.253kg ) is moving toward puck B (with mass 0.372kg ), What was the speed vAi of puck A before the collision
A 270 ball and a 520 ball are linked by a 50.0-cm-long massless, rigid rod. The structure rotates about its center of mass at 120 rpm. What is its rotational kinetic energy.
A ball traveling with an initial momentum of 3.5 kg·m/s bounces off a wall and comes back in the opposite direction with a momentum of -3.5 kg·m/s. What is the change in momentum of the ball
A mercury barometer reads 735.0 mm on the roof of a building and 764.5 mm on the ground. determine the height of the building
An alpha particle (the nucleus of a helium atom formed by 2 protons and 2 neutrons with charge q = +2(1.6 x 10-19 C), Calculate the acceleration of the alpha particle
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