Round 1
The Earth and the moon are attracted to each other by gravitational force. The larger Earth attracts the smaller moon with a force whose magnitude is
The same as that of the force which the moon exerts on the Earth.
What do waves transfer
Energy not matter
What is meant by gravity?
The force by which a planet or other body draws objects toward its center.
What is a black hole?
An area of such immense gravity that nothing—not even light—can escape from it.
Light Energy
A type of kinetic energy in the form of moving waves of light that people can see, as well as invisible waves that cannot be seen.
What is the force of gravity on a 500-newton woman standing on the Earth's surface?
500N
Which are the probable significant sources of gravitational waves?
The probable significant sources of gravitational waves include black holes
The mass of an object can never be zero, but the weight of an object can be zero.
True
A sound wave is what type of wave
Mechanical wave
Chemical Energy
A form of potential energy that is stored in chemical bonds that hold molecules together
If the radius of the Earth somehow decreased with no change in mass, your weight would
Increase
A 400-N person stands on the surface of the Earth. If he were somehow able to stand on a ladder so that he was twice as far from the center of the Earth, he would weight
100N
Sound Energy
Energy caused by an object's vibrations
What is meant by acceleration due to gravity?
the acceleration of a freely falling body under the influence of gravity that is expressed as the rate of increase of velocity
A satellite doesn’t need any fuel to rotate around the earth.
True
What is a mechanical wave
A wave that requires a medium through which to travel
What is the difference between the concept of gravity in Newtonian mechanics and the General Theory of Relativity?
At the equator, what happens to the value of g if the earth stops rotating?
Increases
Mechanical Energy
The total of energy of motion
Type of wave produced when a coil is squeezed together and then released
Longitudinal wave
Why are gravitational waves not easily detectable?
Gravitational waves are not easily detectable. When they enter the Earth, they have a very small amplitude with strain around
Electric Energy
Energy of electrical charges that is created by electrons moving through an electrical conductor
What is a longitudinal waves
A wave in which the particles move back and forth to the path of the wave
The reason the moon does not crash into the Earth is that the
Moon has a sufficient tangential speed
Why do the astronauts experience weightlessness in the international space station?
Because they are falling towards the earth