Jupiter emits about two times as much energy as it receives from the Sun because
a) nuclear fusion
b) its magnetosphere catches particles that collisional
c) volcanoes on the rocky core make the heat
d) it is still radiating heat from its collapse
e) nuclear fission
Ans: d) it is still radiating heat from its collapse
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Simple Pendulum: An astronaut has landed on an asteroid and conducts an experiment to determine the acceleration of gravity on that asteroid. He uses a simple pendulum that has a period of oscillation of 2.00 s on Earth and finds that on the asteroid the period is 11.3 s. What is the acceleration of gravity on that asteroid?
A. 0.307 m/s2 B. 1.66 m/s2 C. 1.74 m/s2 D. 5.51 m/s2 E. 0.0544 m/s2
Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. What are the two possible axis angle settings (less than 180°) of polarizer B?
A. 40° and 90° B. 40° and 130° C. 40° and 140° D. 90° and 130° E. 90° and 140°
A steel bolt (area 5 130 mm2, Es 5 210 GPa) is enclosed by a copper tube (length 5 0.5 m, area 5 400 mm2, Ec 5 110 GPa) and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:
(A) 56 MPa
(B) 62 MPa
(C) 74 MPa
(D) 81 MPa
The inflationary theory of the Universe may explain why the background radiation is so isotropic
a. True b. False Indicate whether the statement is true or false