What did radar astronomers find in the polar regions of Mercury?
A) rift valleys
B) large mare basins, such as near our Moon's south pole
C) water ice that never melts in the deep craters
D) polar caps of dry ice that vary seasonally, much like Mars
E) auroral displays much like Earth's
C
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What is the period (in hours) of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg, its radius is 3.40 × 106 m, and G = 6.67 × 10-11 N • m2/kg2
A) 1.75 h B) 1.25 h C) 1.15 h D) 1.00 h E) 1.45 h
What types of mirrors always produce upright images?
A. Converging and plane B. Diverging and plane C. Converging and diverging D. The image from all types of mirrors is always upright.
Both transverse and longitudinal waves are produced when an earthquake occurs
Indicate whether the statement is true or false
Projectile Motion: A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high. The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence?
A. 0.73 m B. 1.6 m C. 2.7 m D. 3.8 m E. 7.5 m