Which of the following has virtually no effect on the structure of a planet?
A) its composition
B) its size
C) its magnetic field
D) its mass
C
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Conversion of Units: A plot of land contains 5.8 acres. How many square meters does it contain? (1.0 acre = 43,560 ft2 and 2.54 cm = 1.00 in.)
A. 2.3 × 104 m2 B. 7.1 × 103 m2 C. 7.0 × 104 m2 D. 5.0 × 104 m2
Alice is floating freely in her spacecraft, and you are accelerating away from her with an acceleration of 1g. Suppose you claim that you are feeling the effects of a gravitational field. How can you explain the fact that Alice is weightless?
A) She is weightless because she is moving at constant velocity. B) She is weightless because she is in a not moving. C) She is weightless because she is in free-fall. D) If you are in a gravitational field, then she cannot be weightless.
The difference in blood pressure between the head and the foot of a person who is 2.000 m tall and resting on an incline that is at an angle of 30.00 degrees to the horizontal is (density of blood is 1,060
A. 59.80 mmHg. B. 62.77 mmHg. C. 68.55 mmHg. D. 70.22 mmHg. E. 77.94 mmHg.
A motor drives a shaft at f 5 10 Hz and delivers P 5 35 kW of power. The allowable shear stress in the shaft is 45 MPa. The minimum diameter of the shaft is approximately:
(A) 35 mm
(B) 40 mm
(C) 47 mm
(D) 61 mm