Q&A Hero

Physic

Q: A thermostat can work because of a bimetallic strip.
Q: One "food calorie" equals 1000 calories.
Q: A barometer can work because of a bimetallic strip.
Q: Heat is transferred from a substance if it is exposed to something that has a lower temperature.
Q: The hydraulic system in modern aircraft is an example of:a. Bernoulli's principle b. Pascal's principle c. Archimedes' principled. Galileo's principle
Q: The absolute pressure is: a. the gauge pressure plus 1 atmosphere b. the gauge pressure plus the atmospheric pressure c. the gauge pressure minus the atmospheric pressure d. the atmospheric pressure plus 14.7 psi
Q: The cabin pressure of a passenger jet cruising at high altitude (30,000 ft) is about 1 atm. and the pressure outside is about 0.3 atm. What is the outward force on a window measuring 1 foot by 1 foot.a. 10.3 lb b. 100.3 lb c. 1,000.3 lbd. 1,481.8 lbe. 2,116.8 lb
Q: 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 pr2a. 24 lbb. 288 lbc. 904.8 lbd. 1,300.6 lbe. 13,300.6 lb
Q: NARRBEGIN: Two pistons push downTwo pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown.NARRENDThe force F2 in pounds needed to keep piston 2 in place isa. 0.25b. 0.4c. 4d. 10e. 40
Q: NARRBEGIN: Two pistons push downTwo pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown.NARRENDThe pressure on A2 in psi isa. 0.25b. 0.4c. 4d. 10e. 40
Q: NARRBEGIN: Two pistons push downTwo pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown.NARRENDThe pressure on A1 in psi isa. 0.25b. 0.4c. 4d. 10e. 40
Q: 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 isa. 60 lbsb. 120 lbsc. 180 lbsd. 240 lbse. none of the above
Q: A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire isa. 28 lbsb. 32 lbsc. 60 lbsd. 88 lbse. none of these
Q: A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow isa. 0.25 psib. 0.5 psic. 2 psid. 4 psie. none of the above
Q: 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
Q: 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
Q: When people get into a small boat it settles lower in the water anda. the buoyant force increases as a result of more water being displacedb. the net force on the boat again becomes zeroc. the pressure on the bottom of the boat becomes greater because it is deeper in the waterd. all of the above
Q: 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
Q: 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
Q: 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 thand. unrelated to
Q: If the outside air pressure decreases, the reading on a tire gauge connected to a tire a. stays the same b. increases c. decreases d. can not be determined
Q: A solid object labeled A weighs more than another solid object labeled B. Which of the following are true?a. A occupies more volume than B.b. A has a greater weight density than B.c. A has a greater specific gravity than B.d. A has greater volume but lesser weight density than B.e. none of the above
Q: The ratio of the density of a material to the density of water is thea. mass densityb. weight densityc. specific gravityd. buoyant forcee. none of the above
Q: When you suck through a straw, the force that makes the liquid go up the straw is a. a suction force b. due to surface tension c. due to the pressure of the atmosphere d. antigravity
Q: Two inflated balloons are of identical size and shape, but one is filled with hydrogen, the other helium. Which has the larger buoyant force on it? a. neitherthe buoyant forces must be equal b. the helium balloon c. the hydrogen balloon d. It can"t be determined.
Q: A helium balloon rises because ofa. Archimedes' principleb. Pascal's principlec. Bernoulli's principled. Torricelli's principlee. none of these principles
Q: An atomizer works because ofa. Archimedes' principleb. Pascal's principlec. Bernoulli's principled. Torricelli's principlee. none of these principles
Q: The brakes in a car work because ofa. Archimedes' principleb. Pascal's principlec. Bernoulli's principled. Torricelli's principlee. none of these principles
Q: The buoyant force that keeps a ship afloat is an example ofa. Archimedes' principleb. Pascal's principlec. Bernoulli's principled. Torricelli's principlee. none of these principles
Q: How many elements have been identified?a. 92b. 104c. 114d. over 200e. none of the above
Q: What elements do the symbols Fe, Na, Au, and Hg stand for?a. aluminum, nitrogen, silver, tungstenb. iron, sulfur, silver, ytterbiumc. iron, sodium, silver, mercuryd. iron, sodium, gold, mercurye. none of the above
Q: What elements do the symbols H, O, C, and N stand for?a. hydrogen, ozone, carbon, nitrogenb. hydrogen, oxygen, chlorine, nitrogenc. hydrogen, oxygen, carbon, natriumd. hydrogen, oxygen, carbon, nitrogene. none of the above
Q: In the chemical formula for water, H2O, what does the "2" mean?a. There are two oxygen (O) atoms in a molecule of water.b. There are two hydrogen (H) atoms in a molecule of water.c. The hydrogen in water is actually deuterium.d. none of the above
Q: DNA is a complex a. atom b. molecule c. life form d. mystery e. acronym
Q: The molecule is the basic unit of alla. elements b. compounds c. mixturesd. solutions
Q: About how big is an atom?a. too small to measureb. about a millionth of a meter acrossc. about a billionth of a meter acrossd. about a trillionth of a meter acrosse. none of the above
Q: The particle that orbits the central core inside an atom is thea. electronb. protonc. neutrond. nucleuse. none of the above
Q: The central core inside an atom is thea. electronb. protonc. neutrond. nucleuse. none of the above
Q: The uncharged particle inside an atom is thea. electronb. protonc. neutrond. nucleuse. none of the above
Q: The positively charged particle inside an atom is thea. electronb. protonc. neutrond. nucleuse. none of the above
Q: When an object floats in a liquid, the buoyant force is ____________ the weight of the object. a. equal to b. larger than c. smaller than d. not related to
Q: The upward force exerted by a fluid on an object immersed in it is calleda. gravitational forceb. atmospheric forcec. buoyant forced. weighte. none of the above
Q: A plasma state of matter isa. a conducting solidb. a part of the bloodc. an ionized gasd. a conducting liquide. none of the above
Q: If the same-sized force is made to act over a smaller area, the pressure is a. decreased b. increased c. unchanged d. dependent upon the shape of the area
Q: Which of the following is not a unit of pressure?a. atmosphereb. psic. N/m2d. mm of mercurye. pascalf. none of the above
Q: The difference between the pressures inside and outside a tire is calleda. absolute pressureb. gauge pressurec. atmospheric pressured. psie. none of the above
Q: A device that measures absolute air pressure is called aa. manometerb. barometerc. thermometerd. tire gaugee. none of the above
Q: The pressure exerted by a gas is the result ofa. the Bernoulli effectb. molecular collisionsc. Pascal's principled. the ideal gas lawe. none of the above
Q: Most modern aircraft use hydraulics systems to move the control surfaces on the aircraft. This is an example of using Bernoulli's principle.
Q: Carburetors in NASCAR race cars make use of Bernoulli's principle.
Q: You measure the pressure of a tire in Atlanta, GA and find it to be 35 psi. If the tire is taken to Denver, CO (with no other changes made) the pressure will read lower in Denver than in Atlanta.
Q: The altimeter in an aircraft is an aneroid barometer.
Q: The force F2 needed to keep piston 2 in place is 40 pounds.
Q: The pressure on A2 is 40 psi.
Q: The pressure on A1 is 4 psi.
Q: 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 60 pounds.
Q: 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 60 lbs.
Q: A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is 0.25 psi.
Q: The pressure on your left palm is one half the pressure on your right palm.
Q: The force on your left palm is twice than the force on your right palm.
Q: Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m.
Q: The gauge pressure of the water in a swimming pool at 10 ft is twice the gauge pressure of the water at 5 ft.
Q: In a flowing fluid, the pressure where the fluid is moving slower is higher than the pressure where the fluid is moving faster.
Q: 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 lower than the reading on a pressure gauge connected to the pipe at point B.
Q: Gravity causes the pressure in the ocean to vary with depth.
Q: If the outside air pressure decreases, the reading on a tire gauge connected to a tire decreases.
Q: The ratio of the density of a material to the density of water is the weight density.
Q: The air we breathe is mostly oxygen.
Q: If the volume of a container is decreased while the mass and temperature of the gas inside it stay constant, the pressure will increase.
Q: Air can be compressed easily because there is a great deal of empty space between air molecules.
Q: A helium balloon rises because of Archimedes' principle.
Q: An atomizer works because of Bernoulli's principle.
Q: The brakes in a car work because of Pascal's principle.
Q: The buoyant force that keeps a ship afloat is an example of Pascal's principle.
Q: The element symbol C stands for cobalt.
Q: An atom having a single proton in its nucleus is a hydrogen atom.
Q: The number of protons in the nucleus of an atom tells which element it is.
Q: The particle that orbits the central core inside an atom is the electron.
Q: The central core inside an atom is the neutron.
Q: The uncharged particle inside an atom is a neutron.
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