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A 20 kg piece of ice at 0oC is placed outside to melt. After 4 hours, the ice is gone and no water remains. How much heat was absorbed by the ice as it evaporated and melted?
Stress on a Mountaineer's Rope. A nylon rope used by mountaineers elongates 1.60 m under the weight of a 65.0-kg climber. If the rope is 55.0 m in length and 7.0 mm in diameter,
An optometrist prescribes contact lenses that have a focal length of 50.0cm. Are the lenses converging or diverging? Is the person who wears them near-sighted or far-sighted?
In a freight yard a train is being made up. An empty freight car, coasting at 10 m/s, With what speed does the combined mass start to move
A basketball player is 15 {\rm ft} horizontally from the center of the basket, which is 10 {\rm ft} off the ground. At what angle should the player aim the ball
A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
Uranium 238 has a half life of 1.41 x 10^17 sec if the earth is 5.5 billion years old what fraction of the original uranium 238 that was on earth when it formed is left. hydrogen emits red light at a wavelength of 656 nm if M = 2 what value of n do..
An object is to the left of a thin lens. The lens forms an image on a screen that is 2.60 m to the right of the object. Is the image upright or inverted
oppositely charged parallel plates are separated by 5.31 mm. a potential difference of 600 v exists between the
Assume a satellite is in a circular orbit 3.0 Earth radii above the surface of the Earth (4.0 Earth radii from the center of the Earth). Determine by how much does it have to increase its speed
A simple pendulum is 4.00 m long. What is the period of small oscillations for this pendulum if it is located in an elevator accelerating upward at 2.00 m/s2
object a which has been charged to 24.4 nc is at the origin. object b which has been charged to -18.3nc is at xy0 cm
If hot air is used instead of helium, what is the required volume of the balloon if the air inside can be maintained at 37.0 oC
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