Physic

Q: A gold brick measuring 0.25 ft by 0.33 ft by 1 ft is submerged in water. The weight density of gold is 1,200 pounds per cubic foot and the weight density of water is 62.4 pounds per cubic foot. (a) What is the weight of the gold brick? (b) What is the buoyant force on the gold brick? (c) What is the net force on the gold brick?

Q: The body of a swimmer occupies a volume of 2 cubic feet. What is the buoyant force when the swimmer is immersed in water? (The weight density of water is 62.4 pounds per cubic foot.)

Q: A submarine dives to a depth of 50 meters in the ocean. (a) What is the gauge pressure at this depth? (b) What is the force acting on a hatch that has an area of 2.5 square meters?

Q: A rectangular stack of lead bricks measures 2 m by 3 m by 4 m. The mass density of lead is 11,340 kilograms per cubic meter. What is the total mass of the stack of lead?

Q: A rock brought back from the moon weighs 4 pounds and has a volume of 0.02 cubic feet. What is the rock's weight density?

Q: The gauge pressure inside a pressure cooker is 13 psi. What is the net force on the lid of the pressure cooker if the lid's area is 110 square inches?

Q: A person weighing 180 pounds stands on snowshoes. If the total area of the 2 snowshoes is 900 square inches, what is the pressure on the snow?

Q: Match each item with the correct statement below.a. absolute pressure i. liquidb. atom j. mixturec. atmosphere k. moleculed. barometer l. neutrone. buoyant force m. plasmaf. electron n. protong. gas o. specific gravityh. gauge pressure1/ a device that measures air pressure2/ an ionized gas3/ each is composed of two or more atoms4/ the relative pressure between two places5/ a combination of different elements or compounds6/ the upward force exerted by a fluid on anything immersed in it7/ the smallest unit of a chemical element8/ the mass density of a substance divided by the mass density of water9/ particle that orbits the nucleus in an atom10/ a unit of measure for pressure11/ a constituent part of the nucleus of an atom

Q: As a pressurized aircraft gains altitude, the force acting on the boarding door due to the difference between the outside air pressure and the pressure inside the aircraft _____________ with height

Q: As a pressurized aircraft gains altitude, the difference between the outside air pressure and the pressure inside the aricraft _____________ with height

Q: As an aircraft gains altitude, the outside air pressure __________ with height.

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 needed to keep piston 2 in place is __________.

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 __________.

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 __________.

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 __________ psi.

Q: The pressure on your left palm is __________ the pressure on your right palm.

Q: NARRBEGIN: Press a stickYou 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.NARRENDThe force on your left palm is __________ the force on your right palm.

Q: The gauge pressure of the water in a swimming pool at 10 ft is __________ the gauge pressure of the water at 5 ft.

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.

Q: If the outside air pressure decreases, the reading on a tire gauge connected to a tire __________.

Q: Normal atmospheric pressure is about __________.

Q: The pressure exerted by a gas is the result of __________.

Q: The ratio of the density of a material to the density of water is the __________.

Q: The mass density of an object equals its _____ divided by its ________.

Q: A helium balloon rises because of __________ principle.

Q: An atomizer works because of __________ principle.

Q: The brakes in a car work because of __________ principle.

Q: The buoyant force that keeps a ship afloat is an example of __________ principle.

Q: When an object floats in a liquid, the buoyant force is __________ the weight of the liquid displaced by the object.

Q: When an object floats in a liquid, the buoyant force is __________ the weight of the object.

Q: The upward force exerted by a fluid on an object immersed in it is called __________.

Q: Graphite, diamond and buckminsterfullerene are different forms of the element _______.

Q: When a liquid boils and changes to a gas, it is said to have undergone a change of ________.

Q: The three common phases of matter on earth are ________, ___________, and _______.

Q: An ionized gas is a state of matter called a __________.

Q: The four states of matter are __________, __________, __________, and __________.

Q: The SI unit of pressure is __________.

Q: The difference between the pressures inside and outside a tire is called __________.

Q: A device that measures absolute air pressure is called a __________.

Q: The absolute pressure depends ona. the weight of the fluid b. the atmospheric pressure c. the cross sectional aread. the gauge pressure

Q: The nucleus of an atom containsa. protonsb. neutrons c. electronsd. all of the above

Q: Normal atmospheric pressure isa. 14.7 psib. 1 N/m2c. zerod. 760 mm of mercurye. 101,000 pascalsf. none of the above

Q: A 15,000 watt motor is used to lift a 18,000 kg aircraft to a height of 10 m. How much time does it take to lift the aircraft with the motor?

Q: A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, what is the person's power output?

Q: A ball is thrown straight upward with an initial speed of 30 m/s. Assuming there is no air resistance, how high does the ball go before falling back down?

Q: A bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling. Assuming there is no friction and the bottom of the hill is 20 meters below the top, what is the bicyclist's speed at the bottom of the hill?

Q: What is the kinetic energy of a 5,000 kg truck traveling at 25 m/s?

Q: A person with a mass of 60 kg climbs up to a diving board 4 meters above a swimming pool. (a) How much work does the person do? (b) What is the diver's kinetic energy upon entering the water after diving off?

Q: A mover slides a refrigerator 5 meters across a floor. If a force of 200 N was used, how much work was done?

Q: A railroad car with a mass of 20,000 kg rolls into a second stationary car with a mass of 40,000 kg. The cars latch together and move off with a speed of 1.2 m/s. How fast was the first car moving before the collision?

Q: A 50 kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision.

Q: Match each item with the correct statement below.a. angular momentum h. kinetic energyb. elastic collision i. leverc. elastic potential energy j. linear momentumd. energy k. powere. gravitational potential energy l. workf. heat m. internal energyg. inelastic collision1/ type of collision in which kinetic energy is conserved2/ the rate of doing work3/ associated with circular motion4/ can be stored in a spring5/ energy due to motion6/ type of collision in which kinetic energy is not conserved7/ the mass of an object times its velocity8/ the measure of a system's capacity to do work9/ the energy source for a hydroelectric power station10/ the force that acts times the distance moved in the direction of the force11/ The type of energy contained in a compound bow when drawn to its maximum extension.

Q: A light aircraft that weighs 1,600 N is accelerated at 8 m/s/s for 15 seconds. The work done on the aircraft is _________.

Q: A hunter notches a 0.05 kg arrow in a compound bow and draws the arrow back to set the bow. The hunter does 50 J of work in the process setting the bow/arrow combination and then releases the arrow. The speed of the arrow is ___________.

Q: A worker on top of a radar tower 80 m high drops a wrench off the tower. The speed of the wrench when it hits the ground is ____________

Q: In a collision that is inelastic, the total _________ after the collision is not the same as before the collision.

Q: A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is __________.

Q: A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is __________ m/s pointing __________.

Q: After the dropped box hits the floor, its kinetic energy is converted into ____________.

Q: After you drop the box and it has fallen half way, its potential energy is __________ and its kinetic energy is __________.

Q: You drop the box. As it falls to its original level, its kinetic energy is __________.

Q: The increase of potential energy of the box is __________.

Q: The work you do is __________.

Q: You carry a 20 N box 5 m horizontally across a room. The work you do is __________.

Q: The power you supply to the crate is __________.

Q: The work you do on the crate is __________.

Q: The linear momentum of the crate is __________.

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