Which statement expresses Newton's first law of motion?
a. An object with no force on acting on it continues at rest or moves in uniform motion in a straight line with constant velocity.
b. An object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force.
c. For every action, there is an
equal and opposite reaction.
d. The force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared.
e. The force between two objects is inversely proportional to the product of their masses and directly proportional to the distance between them squared.
a
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The average distance from Venus to the Sun is _____
A) 0.7 AU B) 1 AU C) 1.4 AU D) 2 AU
Equilibrium: If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero.
A. True B. False
The Oort Cloud is thought to be
A) the cloud of gas and dust from which our solar system formed. B) a cloud of debris that occasionally encounters the Earth, causing a meteor shower. C) the spherical cloud of comets and some larger icy bodies surrounding the outer solar system. D) a cloud of asteroids moving between the orbits of Mars and Jupiter. E) the material in the ecliptic plane that creates the zodiacal light.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians