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On a planet that has no atmosphere a rocket 15.4 meter tall is resting on its launch pad. The acceleration due to gravity on this planet is 5.45 m/s^2. A ball is dropped from the top of the rocket with zero initial velocity.
a) Find how long does it take the ball to reach the launch pad?
b) Find what is speed of the ball just before it reaches the ground?
The horizontal and vertical components of the initial velocity of a football are 20m/s and 30m/s respectively. What horizontal distance does the football travel during flight
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Galaxy mergers in a rich cluster could impede their use as standard candles over time as they tend to brighten. What is the mean number density of galaxies within the half mass radius
The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft. What is the refractive power of this lens? What focal length (mm) eyepiece would give a magnification of 1000x for this telescope?
Below are birds-eye views of six identical toy cars moving to the right at 2? Various forces act on the cars with magnitudes and directions indicated below. All forces act in the horizontal plane and are either equivalent or at 45 or 90 degrees to ca..
the sound from a church organ revertebrates for many seconds after the organ stops producing sound due to reflections
A cowboy at a dude ranch fills a horse trough that is 1.6 m long, 74 cm wide, and 42 cm deep. He uses a 2.2 cm diameter hose from which water emerges at 1.1 m/s . How long does it take him to fill the trough?
A submarine dives to a depth of 157 feet in the ocean. What is the force (in pounds) acting on a hatch
A 47.3-kg skater is standing at rest in front of a wall. Bypushing against the wall she propels herself backward with avelocity of -2.41 m/s. Her hands are in contact with the wall for1.19 s. Ignore friction and wind resistance.
Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. One end of a rope is attached to the bus, how much work does the tension force do on Magnus
Assume that, as lying on a beach near the equator of a far-off planet watching the sun set over a calm ocean, you start a stopwatch just as the top of the sun disappears.
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