Newton concluded that some force must act on the Moon because ____
a. a force is needed to pull the Moon away from straight-line motion
b. a force is needed to pull the Moon outward
c. a force is needed to keep the Moon in motion
d. the Moon has at a constant velocity
e. the Moon has a constant acceleration
a
You might also like to view...
Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5°. What is the separation between the double slits?
A) 5.0 ?m B) 10 ?m C) 15 ?m D) 20 ?m E) 25 ?m
A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, the ball reaches at its highest point in its trajectory. What is the initial velocity of the ball?
A) 9.8 m/s B) 20 m/s C) 57 m/s D) 4.9 m/s E) 29 m/s
Mort is on Earth, and Velma passes him at a high speed. Mort and Velma each carry a standard kilogram. Concerning the kilograms, Velma observes that
A) Velma's is less massive than 1 kilogram and Mort's has a mass of 1 kilogram. B) Velma's has a mass of 1 kilogram, but Mort's is less massive than 1 kilogram. C) both have a mass of 1 kilogram. D) Velma's has a mass of 1 kilogram, but Mort's is more massive than 1 kilogram. E) Velma's is more massive than 1 kilogram and Mort's has a mass of 1 kilogram.
What is the importance of the carbon dioxide (CO2) cycle?
A) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. B) It makes the growth of continents possible. C) It allows for an ultraviolet-absorbing stratosphere. D) It will prevent us from suffering any consequences from global warming.