A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?
a.
2.0 N
b.
1.4 N
c.
1.6 N
d.
2.8 N
e.
3.4 N
d
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Kinetic energy may be positive or negative
Indicate whether the statement is true or false
Two eggs of equal mass are thrown at a blanket with equal velocity. Egg B hits the blanket but egg A hits the wall instead. Compare the work done on the eggs in reducing their velocities to zero
a. More work was done on A than on B. b. More work was done on B than on A. c. The amount of work is the same for both. d. It is meaningless to compare the amount of work because the forces were so different. e. Work was done on B, but no work was done on A because the wall did not move.
Which book was authored by Copernicus that explained the Sun as the center of a planetary system?
a. Alfonsine Tables b. De Revolutionibus c. Stderreus Nunctus d. The Prutenie Tables e. The Forerunner of the Universe, Containing the Mystery of the Universe
Suppose it costs a utility $0.04/kWh to generate electricity at the generating facility, that long-distance energy transport from the generating facility to your local substation costs the utility $0.0002/kWh/km and that local transport costs $0.0016/kWh/km. a. If the plant is 250 km from the substation and the substation is 25 km from your home,what is the total cost of 1 kWh of electricity
in your home? b. How much of the cost is for local, as opposed to long distance, transmission? c. Can the utility sell it for $0.06/kWh and make a profit? for $0.10/kWh? Explain.