Q: A star near the visible edge of a galaxy travels in a
A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 40 000 ly (light-years) from the galactic center and has a speed of 275 km/s. (a) Estimate the total mass of the ga...
See AnswerQ: A 2.0 kg block is released from rest and allowed
A 2.0 kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0...
See AnswerQ: An ideal engine has an efficiency of 0.725 and uses
An ideal engine has an efficiency of 0.725 and uses gas from a hot reservoir at a temperature of 622 K. What is the temperature of the cold reservoir to which it exhausts heat?
See AnswerQ: Neutron diffraction by a crystal can be used to make a velocity
Neutron diffraction by a crystal can be used to make a velocity selector for neutrons. Suppose the spacing between the relevant planes in the crystal is d = 0.20 nm. A beam of neutrons is incident mak...
See AnswerQ: A heat engine takes in 125 kJ of heat from a reservoir
A heat engine takes in 125 kJ of heat from a reservoir at 815 K and exhausts 82 kJ to a reservoir at 293 K. (a) What is the efficiency of the engine? (b) What is the efficiency of an ideal engine op...
See AnswerQ: About 5.0 × 104 m above Earth's surface, the
About 5.0 × 104 m above Earth's surface, the atmosphere is sufficiently ionized that it behaves as a conductor. Earth and the ionosphere form a giant spherical capacitor, with the lower atmosphere act...
See AnswerQ: Verify the units in Eq. (15-5)—that
Verify the units in Eq. (15-5)—that is, show that the SI unit of pressure times volume is equal to the SI unit of work.
See AnswerQ: How much does the internal energy change for 1.00 m3
How much does the internal energy change for 1.00 m3 of water after it has fallen from the top of a waterfall and landed in the river 11.0 m below? Assume no heat flow from the water to the air.
See AnswerQ: A pot containing 2.00 kg of water is sitting on
A pot containing 2.00 kg of water is sitting on a hot stove, and the water is stirred violently by a mixer that does 6.0 kJ of mechanical work on the water. The temperature of the water rises by 4.00°...
See AnswerQ: What is the change in entropy of 10 g of steam at
What is the change in entropy of 10 g of steam at 100°C as it condenses to liquid water at 100°C?
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