The process of melting lead is an example of
a. a physical change.
b. a chemical change.
c. a physical property.
d. a chemical property.
a
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Energy Conservation With Conservative Forces: A heavy stone and a light stone are released from rest in such away that they both have the same amount of gravitational potential energy just as they are released. Air resistance is negligibly small. Which of the following statements about these stones are correct? (There could be more than one correct choice.)
A. The initial height of the light stone is greater than the initial height of the heavy stone. B. The stones must have been released from the same height. C. The stones both have the same speed just as they reach the ground. D. Just as it reaches the ground, the light stone is traveling faster than the heavy stone. E. The stones both have the same kinetic energy just as they reach the ground.
A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction grating with a slit spacing of 1.70 × 10-4 cm. What is the angle for the first order maximum?
A) 10.5° B) 12.1° C) 16.4° D) 18.2° E) 20.7°
Thermodynamic Processes: When a gas expands adiabatically,
A. the internal (thermal) energy of the gas decreases. B. the internal (thermal) energy of the gas increases. C. it does no work. D. work is done on the gas. E. the temperature of the gas remains constant.
Which of these does Mars NOT have to help its case of past or present life?
A) occasional water flows, and past records of much larger ones B) a protective ozone layer C) carbon dioxide to provide some greenhouse warming D) a favorable distance from the Sun E) rover discoveries of sedimentary rocks and carbonates on the surface of Mars