A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on Earth?
A) 4.40 y B) 5.15 y C) 5.38 y D) 3.23 y
D
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In the text is a photograph that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster C) a large galaxy with four central masses that glow brightly D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots
Why are combustion reactions generally exothermic?
A) Hydrogen easily pulls electrons from the oxygen in water molecules and are reduced. B) During combustion oxygen is oxidized, which gives off lots of energy. C) Combustion involves the transfer of electrons to oxygen, which has an extremely high tendency for gaining electrons. D) It is highly exothermic because combustion involves an oxidation-reduction reaction between a metallic material and oxygen.
Rotational Kinetic Energy: A ball in the shape of a uniform spherical shell (like a soccer ball) of mass 1.5 kg and radius 15 cm rolls down a 35° incline that is 6.0 m high, measured vertically. The ball starts from rest, and there is enough friction on the incline to prevent slipping of the ball.(a) How fast is the ball moving forward when it reaches the bottom of the incline, and what is its angular speed at that instant?(b) If there were no friction on the incline, how fast would the ball be moving forward and what would be its angular speed at the bottom?
What will be an ideal response?
Before it was found that when a substance burns, it is combining with oxygen, it was hypothesized that the burning material released a substance called ______________
Fill in the blank(s) with correct word