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An apparatus that liquefies helium is in a room maintained at 306 K. If the helium in the apparatus is at 4.0 K, what is the minimum ratio Qto/Qfrom, where Qto is the energy delivered as heat to the room and Qfrom is the energy removed as heat from the helium?
the center of a 1.50km diameter spherical pocket of oil is 1.50km beneath the earths surface. estimate by what
The bucket is released from rest at the top of a well and falls a distance 10.3 to the water. You can ignore the weight of the rope.
Two objects of the same mass, m = 1.00 kg, are projected towards each other. The first object initially has velocity (20.0m/s)i^. What is the change in kinetic energy in the collision
A rock is kicked off the edge of a cliff 45.0m high with an initial velocity of 10.0m/s in the horizontal direction. How far from the bottom edge of the cliff does it land
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1360 Hz. The bird-watcher, however, hears a frequency of 1430 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
what force would be needed to pull the same wooden.
A high-speed drill reaches 2300rpm in 0.51s. What is the drill's angular acceleration
During a 75-ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 6.3-mA current in a nearby secondary coil. What is the change in the primary current
A student is standing on a ladder as shown in the figure to the right. Each leg of the ladder is 2.7 m long and is hidged at point C. What is the tension in the tierod
A ball is thrown straight up from a height of 1.56m above the ground and reaches a maximum height of 8.35m before falling to the ground. What the calls total time in the air
A student has built a 20-cm-long pinhole camera for a science fair project. How far should she stand from the Washington Monument
A passenger in a train that moves horizontally looksoutside and sees a child hitting a ball straight up to a height of30 m. Find the speed of the train relative to the ground
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