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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science