A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker, what total work is done on the wheelbarrow?
a. 240 J
c. 144 J
b. 216 J
d. 96 J
C
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The Milky Way galaxy is part of
a. the Virgo cluster. b. the Large Magellanic Cloud. c. the Small Magellanic Cloud. d. the Local Group. e. a rich cluster.
The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 11.6 × 105 Pa B) 11.6 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa
In a thundercloud there may be an electric charge of +30 C near the top of the cloud and ?30 C near the bottom of the cloud. These charges are separated by about 4.00 km. What is the electric force between these two sets of charges? (ke = 8.99 × 10^9 N·m2/C2)
a. 5.1E+11 N b. 1.3E+20 N c. 5.1E+5 N d. 2.0E+9 N e. 3.2E+13 N
The rings of Saturn were discovered by ______________
Fill in the blank(s) with correct word