A horizontal force of 200 N is applied to a 55-kg cart across a 10 m level surface. If the cart accelerates at 3.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. -900 J
c. -350 J
b. -175 J
d. -700 J
C
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Fill in the blank(s) with correct word
The gas in a perfectly insulated but there is work done on the flexible container at a rate of - At what rate is the internal (thermal) energy of the gas changing?
A) -13 W B) 13 W C) 0 W D) 6.5 W
Suppose you have a time-keeping device that always reads precisely 12:00 when the Sun crosses your meridian. What kind of time is this clock keeping?
A) mean solar time B) standard time C) apparent solar time D) universal time
A water pipe with inner radius r1 is connected to a junction with two equal-diameter pipes. Water flows through each of the two pipes with a speed of v. If the diameter of each of the two pipes is ΒΌ the diameter of the single pipe, what is the flow rate in the single pipe?
a. v/8 b. v/4 c. 4v d. 8v