A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center
What magnitude forces do the sawhorses exert on the board?
16 N at the end, 24 N at the midpoint
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A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
a.
W/L
b.
L/W
c.
d.
e.
In order for a satellite to be geosynchronous, its orbit must:
a. go over the North and South Poles. c. be over a single longitude. b. be over the equator. d. emit television signals.
Which of the following best distinguishes the Kuiper belt from the Oort cloud?
A) Both are made up of many comets, but Kuiper belt comets orbit within a donut-shaped region just beyond the orbit of Neptune, while Oort cloud comets orbit much farther from the Sun and can have orbits of all inclinations. B) The Kuiper belt is made up of rocky asteroids, while the Oort cloud is made up of icy comets. C) The Kuiper belt is located between the orbits of Mars and Jupiter, while the Oort cloud lies far beyond Neptune. D) The Kuiper belt consists of only of very large comets (similar in size to Pluto), while the Oort cloud consists only of very small comets.
What is a mutation?
A) a change in a living cell's DNA B) a change in an organism that turns it into a different species C) a change in the type of food an organism consumes D) a change in the physical appearance of a living organism