The coefficient of linear expansion of copper is 17 × 10-6 K-1 and that of steel is 12 × 10-6 K-1. At 12°C a steel rod has a diameter of 2.540 cm and a copper pipe has a diameter of 2.536 cm
Which one of the following quantities is closest to the temperature to which the copper pipe must be heated in order for the unheated steel rod to fit snugly in the copper pipe?
A) 105°C B) 93°C C) 81°C D) 53°C E) 143°C
A
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Which of the following describes a star with a hydrogen-burning shell and an inert helium core?
A) It is a red giant that grows in luminosity until it dies in a planetary nebula. B) It is a subgiant that gradually grows dimmer as its hydrogen-burning shell expands and cools. C) It is a subgiant that grows in luminosity until helium fusion begins in the central core. D) It is what is known as a helium-burning star, which has both helium fusion in its core and hydrogen fusion in a shell.
You double your distance from a constant sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A) one-half its original value. B) one-fourth its original value. C) one-sixteenth its original value. D) one-eighth its original value. E) 1/ of its original value.
A gasoline engine absorbs 2500 J of heat and performs 1000 J of mechanical work in each cycle. The amount of heat expelled in each cycle is
a. 1000 J b. 1500 J c. 2000 J d. 500 J e. 3000 J
Uranus rotates on an axis that is inclined 98.0° from the perpendicular to its orbit
a. True b. False Indicate whether the statement is true or false