A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
a. 43 m/s
b. 47 m/s
c. 39 m/s
d. 36 m/s
e. 14 m/s
b
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About what percentage of the original hydrogen and helium of the universe had been converted into heavier elements by the time our solar system was born?
A) 20% B) 10% C) 50% D) 2%
Grass appears green because
A) it emits green light and absorbs other colors. B) it absorbs green light and emits other colors. C) it transmits green light and emits other colors. D) it reflects green light and absorbs other colors.
Kirchhoff's Rules: A multiloop circuit is shown in the figure. Find the emf ?1 if the batteries are ideal. (It is not necessary to solve the entire circuit.)
A. -4 V B. 4 V C. 44 V D. 52 V E. -52 V
An astronaut weighs 900 N when measured on the surface of Earth. How large would the force of gravity on him be if he were in an Earth satellite at an altitude equal to Earth's radius?
A. 225 N B. 450 N C. 900 N D. 3600 N