Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
A) the one thrown upward
B) the one thrown downward
C) neither, both hit with the same speed
Answer: C
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Graphical Analysis: The motion of a particle is described in the velocity vs. time graph shown in the figure. 
Over the nine-second interval shown, we can say that the speed of the particle
A. only increases. B. only decreases. C. increases and then decreases. D. decreases and then increases. E. remains constant.
Which of the following statements correctly describe the relationship between stars and constellations?
What will be an ideal response?
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5.0 km if we neglect the earth's rotational effects? (The mean radius of the Earth is 6.38 × 106 m, G = 6.67 × 10-11 N ? m2/kg2.)
A) -0.60 N B) -1.5 N C) -2.6 N D) -3.6 N E) -5.2 N
A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side
You want to fill the screen as completely as possible without any of the image falling beyond the screen. Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?