If pressure inside a cylinder with a circular hatch is 2 atm and the radius of the entrance hatch is 12 inches, what force does the air exert on the hatch? Recall that the area of a circle is r2
a. 24 lb b. 288 lb
c. 904.8 lb d. 1,300.6 lb
e. 13,300.6 lb
[Ques. 2] When a 4-cubic-ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is
a. 60 lbs.
b. 120 lbs.
c. 180 lbs.
d. 240 lbs.
e. none of the above.
[Ques. 3] A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire is
a. 28 lbs.
b. 32 lbs.
c. 60 lbs.
d. 88 lbs.
e. none of these.
[Ques. 4] A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is
a. 0.25 psi.
b. 0.5 psi.
c. 2 psi.
d. 4 psi.
e. none of the above.
[Ques. 5] You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm.The pressure on your left palm is ____________ the pressure on your right palm.
a. 1/4
b. 1/2
c. equal to
d. 2 times
e. 4 times
[Ques. 6] You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm.The force on your left palm is __________ the force on your right palm.
a. 1/4
b. 1/2
c. equal to
d. 2 times
e. 4 times
[Ques. 7] When people get into a small boat it settles lower in the water and
a. the buoyant force increases as a result of more water being displaced.
b. the net force on the boat again becomes zero.
c. the pressure on the bottom of the boat becomes greater because it is deeper in the water.
d. all of the above.
[Ques. 8] The pressure at the bottom of aquarium A is greater than that at the bottom of aquarium B. Why might this be?
a. A is filled with fresh water, B has the same amount of salt water.
b. A is filled to a greater depth than B.
c. A has greater volume than B.
d. The bottom of aquarium A has smaller area than that of B.
e. none of the above
[Ques. 9] The gauge pressure of the water in a swimming pool at 10 ft is ____________ the gauge pressure of the water at 5 ft.
a. 1/4
b. 1/2
c. equal to
d. 2 times
e. 4 times
[Ques. 10] Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be _____________ the reading on a pressure gauge connected to the pipe at point B.
a. the same as b. higher than
c. lower than d. unrelated to
Quick Reply
