The interior of Jupiter is mostly liquid helium
a. True
b. False
Indicate whether the statement is true or false
False
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How is the lifetime of a star related to its mass?
A) More massive stars live slightly shorter lives than less massive stars. B) More massive stars live much longer lives than less massive stars. C) More massive stars live much shorter lives than less massive stars. D) More massive stars live slightly longer lives than less massive stars.
In an isolated system of two bodies that exert gravitational forces on one another, the quantity (quantities) that remain(s) constant is(are)
a. the total energy of the system. b. the total angular momentum of the system. c. the angular positions of the two bodies. d. all of the above. e. only (a) and (b) above.
Two slits are illuminated with green light (l = 540 nm). The slits are 0.05 mm apart and the distance to the screen is 1.5 m. At what distance (in mm) from the central maximum on the screen is the average intensity 50% of the intensity of the central maximum?
a. 1 b. 3 c. 2 d. 4 e. 0.4
Projectile Motion: A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high. The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence?
A. 0.73 m B. 1.6 m C. 2.7 m D. 3.8 m E. 7.5 m