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A rock is thrown vertically upward with an initial speed of 100 ft/s. At the same instant another rock is thrown vertically downward from the top of a 280 ft cliff with an initial speed of 40 ft/s. Neglecting air friction,
a. Express the height above the around for each rock as a function of time.
b. Find the time when the rocks pass each other.
c. Find the height above the ground at which the rocks pass each other.d. When are the speeds of the rocks the same?
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is5.00 106 m. What is the orbital speed of the second satellite
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As astronauts travel between the Earth and the moon, their mass remains constant, but their weight diminishes. Determine the minimum weight an astronaut would have
A 3.7-m-tall, 60-cm-diameter concrete column supports a 2.0×10^5 load. By how much is the column compressed
Determine the angular acceleration of the pulleys and the tension T in the cord supporting the 612 Kg mass when it is released from rest.
A bat emits a sound whose frequency is 91.20 kHz. The speed of sound in air at 20 degrees Celcius is 343m/s. However the air temperature is 38.8 degrees Celcius, so the speed of sound is not 343m/s. imagine that air behaves like an ideal gas, and ..
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 11.42 m to a store. At what angle is the escalator inclined above the horizontal
On a banked race track, the smallest circular path on which cars can move has a radius of 106 m, compute the largest speed at which cars can move on this track without relying on friction
How many half-lives are required for the number of radioactive nuclei to decrease to 1/1010 of the initial number
An important news announcement is trans- mitted by radio waves to people who are 122 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 1.2 m from the newscaster. Take the speed of sound in air to be 345 ..
A charged line extends from y = 2.50 cm to y = -2.50 cm. The total charge distributed uniformly along the line is -8.50 nC. Find the magnitude of the electric field on the x-axis at x = 10.0 cm
Determine out the magnitude of the average force that the water exerts on the diver. This force is neoconservative.
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