A uniform solid sphere has a moment of inertia I about an axis tangent to its surface. What is the moment of inertia of this sphere about an axis through its center?
A) 1/7 I
B) 2/7 I
C) 2/5 I
D) 3/5 I
E) 7/5 I
Answer: B
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A thermodynamic engine with an efficiency of 30% performs 2500 J of work. How much thermal energy is discharged to the lower temperature reservoir?
A) 5800 J B) 8300 J C) 750 J D) 1400 J E) 7100 J
How did Galileo know that the planets go around the sun rather than around Earth?
A) From telescopic observations of the phases of Venus as it moves around the sun. B) From telescopic measurements of the positions of the stars as Earth moved around the sun during the course of one year. C) From the writings of Aristarchus, the ancient Greek astronomer. D) By noting that Venus always lies near the sun, as seen from Earth, from which he concluded that Venus must be orbiting the sun. E) From measurements of the tides raised by the moon as compared with the tides raised by the sun.
Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there. b. The temperature is the hottest in the center. c. The density of material is very high in the center. d. The temperature is the hottest in the center and the density of material is very high in the center. e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
In braking an automobile, the friction between the brake drums and brake shoes converts the car's kinetic energy into heat. If a 1500-kg automobile traveling at 30 m/s brakes to a halt, how much does the temperature rise in each of the four 8.0-kg brake drums? (The specific heat of each iron brake drum is 448 J/kg?°C).
What will be an ideal response?