When strong solar winds are displaced poleward by our magnetic fields, we get:
A) the Van Allen radiation belts.
B) intense auroral displays.
C) sunspots.
D) hurricanes in the tropics.
E) droughts and dust bowls in the American West.
B
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Young's Modulus: A vertical 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod caused by this mass? Young's modulus for steel is 2.0 × 1011 N/m2.
A. 5.6 × 10-5 m B. 6.5 × 10-5 m C. 5.6 × 10-6 m D. 6.5 × 10-6 m E. 6.5 × 10-4 m
To calculate the masses of stars in a binary system, we must measure their ________
A) luminosities and distance from Earth B) orbital period and average orbital distance C) absolute magnitudes and luminosities D) spectral types and distance from Earth
An object is acted on by a drag force with a magnitude that is proportional to the speed. The object accelerates downward at 3.00 m/s2 when it is falling with a speed 20.0 m/s. What is the terminal speed of the object as it is falling?
A) 38.1 m/s B) 55.9 m/s C) 28.8 m/s D) 65.4 m/s E) 43.2 m/s
A segment of a drive shaft (d2 5 200 mm, d1 5 160 mm) is subjected to a torque T 5 30 kN?m. The allowable shear stress in the shaft is 45 MPa. The maximum permissible compressive load P is approximately:
(A) 200 kN
(B) 286 kN
(C) 328 kN
(D) 442 kN
