For each 8-km segment of a satellite in close Earth orbit, the "drop" toward Earth is about
A) 5 m.
B) 10 m.
C) also 8 km.
Answer: A
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Work-Energy Theorem: The graph in the figure shows the magnitude of the net horizontal force Fx on a 25-kg package as a function of the position x of the package. Just before the force was applied, the package was originally sliding at 6.0 m/s in the +x direction on a smooth horizontal floor. Find the x component of the velocity of the package just after the force has stopped in each of the following cases.(a) The force is applied in the same direction as the original velocity of the box.(b) The force is applied in the opposite direction to the original velocity of the box.
What will be an ideal response?
Suppose you live at latitude 40°N. Which of the following describes the path of the celestial equator through your sky?
A) It extends from due east on your horizon, to an altitude of 50° in the south, to due west on your horizon. B) It extends from due south on your horizon, to your zenith, to due north on your horizon. C) It extends from due east on your horizon, to an altitude of 40° in the south, to due west on your horizon. D) It extends from due east on your horizon, to an altitude of 40° in the north, to due west on your horizon.
A 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod? Young's modulus for steel is 20 × 1010 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
The velocity of an airplane with respect to the ground is 
m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the airplane with respect to the air is 
m/s at an angle of 60.0 degrees NORTH of EAST. What is the velocity of the air with respect to the ground?
A. 112 m/s at 50.0 degrees NORTH of EAST B. 102 m/s at 17 degrees SOUTH of EAST C. 134 m/s at 49 degrees SOUTH of EAST D. 134 m/s at 17 degrees NORTH of EAST E. 102 m/s at 65 degrees NORTH of EAST