When an acrobat hangs motionless from a pair of rings
a. she has no measurable weight.
b. her weight depends on the angles the ropes make with the ceiling.
c. her weight is reduced by the upward force the rings exert on her.
d. her weight is increased by the upward force the rings exert on her.
e. she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.
e
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If you stand closer to a concave mirror than a distance of one focal length, the image you see is
a. real and inverted. b. real and upright. c. virtual and inverted. d. virtual and upright. e. none of the above because you do not get an image.
The twinkling of the stars is a result of atmospheric
A) reflection. B) refraction. C) scattering. D) dispersion. E) aberrations.
Gaps in the asteroid belt (often called Kirkwood gaps) are caused by ________
A) tidal forces from Jupiter B) tidal forces from the Sun C) the competing gravitational tugs of Mars and Jupiter D) orbital resonances with Jupiter
A frictionless pendulum clock on the surface of the earth has a period of 1.00 s. On a distant planet, the length of the pendulum must be shortened slightly to have a period of 1.00 s
What is true about the acceleration due to gravity on the distant planet? A) The gravitational acceleration on the planet is slightly greater than g. B) The gravitational acceleration on the planet is slightly less than g. C) The gravitational acceleration on the planet is equal to g. D) We cannot tell because we do not know the mass of the pendulum.