In the past, Earth has been hit by many asteroids, some very large. Suppose one such asteroid approached Earth so that when it was very far away it was traveling at 6500 m/s along a line that would miss the center of Earth by 8,500,000 m
Because of the gravitational attraction of Earth, it departed from this straight line and curved towards Earth, colliding with it. What was the speed of this asteroid when it hit Earth if we ignore the effect of the sun? The mass of Earth is 5.97 × 1024 kg, its radius is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2.
A) 11400 m/s
B) 12900 m/s
C) 13700 m/s
D) 15800 m/s
E) 16400 m/s
B
You might also like to view...
The specific heat capacity of water is about twice the specific heat capacity of ice. The amount of heat required to raise the temperature of 1 kg of water 10°C is __________ times the amount of heat required to raise the temperature of 1 kg of ice 10°C
Fill in the blank(s) with correct word
An AC power generator produces 27 A (rms) at 4730 V. The energy is transmitted through a long-distance power line, which has a total resistance of 173 ?. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 1% b. 20% c. 31% d. 99% e. 98%
A bank vault is opened by applying a force of 140 N perpendicular to the plane of the door, 1.20 m from the hinges. Find the torque due to this force about an axis through the hinges
a. 117 N·m b. 308 N·m c. 140 N·m d. 168 N·m e. 154 N·m
The figure shows a cross section of three parallel wires each carrying a current of 5.0 A out of the paper. If the distance R = 6.0 mm, what is the magnitude of the magnetic force on a 2.0-m length of any one of the wires?
a.
2.5 mN
b.
3.3 mN
c.
2.2 mN
d.
2.9 mN
e.
1.7 mN