When objects stick together after colliding, the collision is completely elastic
Indicate whether the statement is true or false
FALSE
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If we use the Doppler method to measure the period with which a star alternately moves toward and away from us due to an orbiting planet, then we also know the
A) orbital period of the planet. B) mass of the planet. C) distance to the star. D) radius of the planet.
Aristotle's hypothesis was that:
A) lunar eclipses were created by our shadow. B) only a spherical Earth would always cast a circular shadow on the Moon. C) lunar eclipses would have to happen every full moon. D) the Sun lay at the center of the planet orbits. E) the Moon orbited the Earth.
What causes the radio pulses of a pulsar?
A) The star vibrates. B) As the star spins, beams of radio radiation sweep through space. If one of the beams crosses Earth, we observe a pulse. C) The star undergoes periodic explosions of nuclear fusion that generate radio emission. D) The star's orbiting companion periodically eclipses the radio waves emitted by the main pulsar. E) A black hole near the star absorbs energy and re-emits it as radio waves.
A hornet circles around a pop can at increasing speed while flying in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down. b. down and inwards. c. down and outwards. d. down and backwards. e. down, backwards and outwards.