An Earth satellite is orbiting at a distance from the Earth's surface equal to one Earth radius (4 000 miles). At this location, the acceleration due to gravity is what factor times the value of g at the Earth's surface?
a. There is no acceleration since the satellite is in orbit.
b. 2
c. 1/2
d. 1/4
d
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Gravitational Force: A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?
Approximately what mass ratio is required for a rocket to leave the Earth's gravity?
A) 60 B) 99 C) 25 D) 39
An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^-6 (°C)-1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g×°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
Which of these is a consequence of atmospheric refraction?
a. The Sun and Moon appear to set sooner than they actually set. b. The Sun appears smaller when it is directly overhead. c. The Moon appears larger when it is directly overhead. d. Planetary bodies directly overhead appear displaced from that location. e. The Sun and Moon appear to rise sooner than they actually rise.