physics test 11/5/2021
A child sits on a carousel at a distance of 3.5 m from the center and rotates through an arc length of 6.5 m. What is the angular displacement of the child
1.9 radians
The gravitational force between two masses is 36N. What is the gravitational if one mass is doubled and the distance between is doubled
18N
A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the magnitude of the bicycle's centripetal acceleration?
2m/s^2
the gravitational force between two masses is 36 N. what is the gravitational force if the distance between them is tripled?
4N
one radian equals
57.3 degrees
A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What is the centripetal force on the pair?
86N
the gravitational force between two masses is 36 N. What is the gravitational force if both masses are cut in half
9N
which of the following equations expresses Newton's law of universal gravitation?
Fg=G(m1m2/r^2)
In this text, which of the following symbols represents the constant of universal gravitation?
G
which of the following is not one of Kepler's law of planetary motion
all above are true
Newton's Law of Universal Gravitation
can be used to derive Kepler's third law of planetary motion
one fighter jet makes the same radius turn as another but at twice the speed. Compared to the slower jet, the centripetal acceleration of the faster jet is
four times as much
one fighter jet makes the same radius turn as another, but at twice the speed. Compared to the slower jet, the centripetal force on the faster jet is
four times as much
A child rides a bicycle in a circular path with a radius of 2.0 m. The tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg. What kind of force provides the centripetal force on the bicycle.
friction
the degree to which an object attracts other objects is measured by the objects
gravitational mass
the mass that determines an object's attraction to another object is determined by its
gravitational mass
how did Newton show that gravity as a force is universal
he showed that the moon falls
in the figure above, according to Kepler's law of planetary motion
if change in t1= change in t2, then A1=A2
The centripetal force on an object in circular motion is
in the plane of the objects motion and perpendicular to the tangential speed.
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
inertia
An object's tendency to resist acceleration is measured by the object's
inertial mass
How would the speed of Earth's orbit around the sun change if Earth's distance from the sun increased by 4
it would decrease by a factor of 2
How would the speed of Earth's orbit around the sun change if Earth's mass increased by 4 times?
it would increase by a factor of 2
when an object is moving in uniform circular motion, the object's velocity and acceleration are
tangent and radially inward, respectively
what term describes a change in speed of an object in circular motion?
tangential acceleration
when an astronaut in orbit experiences apparent weightlessness
the net gravitational force on the astronaut is not balanced by a normal factor
when simulating gravity by rotating a space station, the effect of gravity is caused by
the wall of the space station pushing inward on the astronauts.
squeezing due to differences in the gravitational force of the moon at different points on Earth cause
tides
one fighter jet makes a turn. Later the same jet makes a turn with half the radius at the same speed. Compared to the first turn, the jet's centripetal acceleration round the 2nd turn is
twice as much
