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Question
As comets approach and move around the Sun, the coma and the tail ______________ in size.A) decrease
B) increase
C) remain the same
D) none of the above
Answer
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Related questions
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A change in motion requires a(n) ____________.
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B) torque.
C) linear momentum.
D) angular momentum.
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A) 0.0 N
B) 6.1 N
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Newton's law of universal gravitation is believed to be applicable
A) to the Milky Way only.
B) on Earth and the Moon only.
C) throughout the universe.
D) to the solar system only.
E) on Earth only.
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In the equation A = B/C, the A and B are said to be _______________ proportional.
A) directly
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Newton's third law of motion states that the force pair acting on different objects consists of two forces that
A) are under the influence of gravity.
B) are equal and in the same direction.
C) always produce an acceleration.
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Q:
______________ principle explains why objects float or sink in a fluid.
A) Newton's
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C) Bernoulli's
D) Archimedes'
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The buoyant force of an object is equal to the ______________ of the ______________ it displaces.
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B) weight; fluid
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If an object of mass 8 kg has an acceleration of 5 m/s2, what is the unbalanced force acting on it?
A) 40 N
B) 1.6 N
C) 0.63 N
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Q:
A spacecraft in space keeps going at the same velocity, even without firing its rockets, in accordance with the _______________ law of motion.
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C) second
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Q:
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A mass is accelerated when ______________ acts upon the mass.
A) a balanced force
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C) no force
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Q:
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If an object has a constant velocity, then its acceleration is ______________.
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A projectile's vertical velocity component
A) changes most rapidly near the top of its trajectory.
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Q:
The magnitude of the acceleration of an object moving in a circle at constant speed is
A) inversely proportional to the speed squared.
B) inversely proportional to the speed.
C) inversely proportional to the radius of the circle squared.
D) inversely proportional to the radius of the circle.
Q:
The direction of the acceleration of an object moving in a circle at constant speed is
A) changing, but pointing in a predictable direction.
B) constant and pointing in only one direction.
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B) Normal to the plane of the circle
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B) the object's speed increases by 9.8 m/s each second.
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If an object moves with constant velocity,
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E) all of these
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