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Question
A star of magnitude 1 appears _______________ times brighter than a star of magnitude 2.A) 5.21
B) 3.14
C) 10
D) 2.51
Answer
This answer is hidden. It contains 1 characters.
Related questions
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A change in motion requires a(n) ____________.
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The quantity mvr is an object's
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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.
Q:
In the equation A = B/C, the A and B are said to be _______________ proportional.
A) directly
B) inversely
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D) exactly
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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
B) Pascal's
C) Bernoulli's
D) Archimedes'
Q:
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.
A) fourth
B) first
C) second
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A constant net force acting on an object that is free to move will produce a constant
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B) velocity.
C) displacement.
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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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The straight-line distance and direction between two points are, together, called ______________.
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A projectile's vertical velocity component
A) changes most rapidly near the top of its trajectory.
B) changes at a constant rate.
C) changes most rapidly near the bottom 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.
C) constant and pointing in two directions.
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An object travels in a circle of radius 10.0 m with a constant speed of 3.0 m/s. What is the direction of its acceleration?
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B) Normal to the plane of the circle
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A) the object's displacement changes by 9.8 m every second squared.
B) the object's speed increases by 9.8 m/s each second.
C) the object's acceleration increases by 9.8 m/s2each second.
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A freely falling object
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B) is unaffected by gravity.
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If an object moves with constant velocity,
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C) its average speed is constant.
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E) all of these
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A car travels at a constant speed of 100.0 km/h around a circular track with a diameter of 1.00 km. What is the magnitude of the car's centripetal acceleration, and what supplies this?