A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)
A) 4.0 × 10-19 kg ? m/s
B) 4.4 × 10-19 kg ? m/s
C) 5.0 × 10-19 kg ? m/s
D) 5.8 × 10-19 kg ? m/s
E) 6.7 × 10-19 kg ? m/s
E
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We are among the products of nuclear fusion and gravitational contraction
a. True b. False Indicate whether the statement is true or false
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A) It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. B) You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. E) When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2.
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding?
a) all galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going b) all galaxies outside the Local Group are moving away from us, and all are moving away nearly the same speed c) all galaxies contain billions of star and all galaxies have spiral shapes
What is absolutely necessary for living organisms to survive?
A) energy B) sunlight C) oxygen D) food in the form of other organisms E) all of the above