A one-kilogram aluminum ingot is heated from 0°C to 100°C. By what amount does its mass change? The specific heat of aluminum is 900 J/(kg?K)
A) Its mass does not change.
B) Its mass increases by 0.50 × 10-12 kg.
C) Its mass decreases by 0.50 × 10-12 kg.
D) Its mass increases by 1.0 × 10-12 kg.
E) Its mass decreases by 1.0 × 10-12 kg.
D
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Nonmagnetic metals in municipal waste are separated with ___________.
Fill in the blank(s) with the appropriate word(s).
In some cases, a supernova in a binary system may lead to the eventual formation of an accretion disk around the remains of the star that exploded. All of the following statements about such accretion disks are true except
A) X-rays are emitted by the hot gas in the accretion disk. B) the accretion disk consists of material that spills off the companion star. C) the central object about which the accretion disk swirls may be either a neutron star or a black hole. D) several examples of flattened accretion disks being "fed" by a large companion star can be seen clearly in photos from the Hubble Space Telescope. E) the radiation from an accretion disk may vary rapidly in time.
Two long, parallel wires carry currents of 20.0 A and 10.0 A in opposite directions (Fig. OQ30.9). Which of the following statements is true? More than one statement may be correct
If a moving object hits a still object, what happens to the momentum of the moving object?
a. The momentum of the moving object is increased by the force of the collision. b. The momentum of the moving object goes to zero at the moment of collision. c. The two stick together and move at the same speed afterward. d. The momentum of the moving object is decreased by the amount of momentum the stationary object picks up at the time of the collision. e. The momentum of the moving object matches the momentum of the stationary object.