Why do some of the bright stars (such as the one indicated by the arrow) in this photo have cross-shaped spikes over them?
A) The spikes are an artifact of photography through a telescope.
B) The spikes are flares ejected from the surfaces of bright stars.
C) Very bright stars tend to be slightly nonspherical in shape and therefore look like they have spikes in photos.
D) The stars with spikes are actually binary star systems.
A) The spikes are an artifact of photography through a telescope.
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What is the Big Bang theory?
A) the idea that the universe as we see it formed when two massive galaxies collided together B) the idea that all matter and energy in the universe began in an unimaginably dense state, and then space itself began expanding C) the idea that the galaxy formed from the supernova explosion of a massive star
PTFE has low _________energy. This results in other materials not sticking to it, and applications in cookware.
Fill in the blank(s) with the appropriate word(s).
A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp? A) 34 J B) 22 J C) 45 J D) 62 J E) This question cannot be answered without knowing the radius of the hoop.
A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than B. less than C. the same as