Graphical Analysis: The graph in the figure shows the velocity of a particle as it travels along the x-axis. (a) In what direction (+x or -x) is the acceleration at t = 0.5 s?(b) In what direction (+x or -x) is the acceleration at t = 3.0 s?(c) What is the average acceleration of the particle between t = 2.0 s and t = 4.0 s?(d) At what value of t is the instantaneous acceleration equal to 0 m/s2?
What will be an ideal response?
(a) -x (b) +x (c) 1.5 m/s2 (d) 1.0 s
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A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?
A) 34°C B) 36°C C) 40°C D) 38°C
Which of these are English units?
a. seconds b. feet c. kilometers d. slugs
A split highway has a number of lanes for traffic. For traffic going in one direction, the radius for the inside of the curve is half the radius for the outside. One car, car A, travels on the inside while another car of equal mass, car B, travels at equal speed on the outside of the curve. Which statement about resultant forces on the cars is correct?
a. The force on A is half the force on B. b. The force on B is half the force on A. c. The force on A is four times the force on B. d. The force on B is four times the force on A. e. There is no net resultant force on either as long as they stay on the road while turning.
Four different compact fluorescent bulbs and their comparison to incandescent bulbs are advertised as follows: a 42-W cfl produces the light of a 150-W incandescent, a 9-W cfl produces the light of a 40-W incandescent, a 23-W cfl produces the light of a 100-W incandescent,and a 13-W cfl produces the light of a 60-W incandescent. Which cfl produces the most light per watt, and which one produces
the least? Assume true advertising! a. the 13 W, the 42 W c. the 23 W, the 42 W b. the 9 W, the 23 W d. the 42 W, the 13 W