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ch 4 study guide
| Question | Answer |
|---|---|
| work is defined as force times | parallel distance |
| a joule/meter (J/m) is a unit of | force |
| which of the following is not a unit of work | watt |
| work requires | motion |
| The __________ distance is used in calculating work | parallel |
| which of the following is a vector quanity | none of these |
| the quantity mv^2 / 2 is known as | kinetic energy |
| the energy of motion is called | kinetic energy |
| an object of mass 6 kg has a speed of 4 m/s and moves a distance of 8m. What is its kinetic energy in Joules? | 48 |
| An object has kinetic energy of 36 J. If its speed is 3 m/s, what is its mass | 8 |
| a 6 kg object moves vertically a distance of 5 m. Its potential energy has changed by approximately how much | it has increased by 300 J |
| When an 8kg object increases its potential energy by 560 J approximately how has its position changed? | It has risen vertically 7 m |
| an 100 kg car traveling at 50 m/s takes 2 m to stop under dull braking. The same car under similar road conditions, traveling at 100 m/s, takes _______ m to stop under full braking | 8 |
| a student weighing 100 N climbed a flight of stairs 3.0 high in 6 s. How much work was done by the student. | 300 J |
| a student weighing 300 N climbs a flight of stairs 7.0 , high in 2 s. What power is required to perform this task? | 150 W |
| The kinetic energy of a pendulum is greatest | at the bottom of its swing |
| the potential energy of a pendulum is least | at the bottom of its swing |
| the kinetic energy of a pendulum is least | at the top of its swing |
| the potential energy of a pendulum is greatest | at the top of its swing |
| which of the following four objects has the greatest kinetic energy? | an object of mass 2m moving with speed 3v |
| which of the following four objects has the least kinetic energy | an object of mass 4m moving with speed v |
| the energy of position is called | potential energy |
| potential energy values may be | all of these |
| if you lift a 30 n weight vertically 45 m above the guard you are | doing work against gravity |
| we define the total mechanical energy of an object | potential energy plus kinetic energy |
| the energy of a system | decreases when work is done by the system |
| mechanical energy | is the sum of the energies of motion and position |
| mechanical energy | is the sum of kinetic energy and potential energy |
| a system may | all of these |
| power is | work divided by time |
| power is | the time rate of doing work |
| one watt is equal ____ per second | one joule |
| one ______ is equal to one joule per second | watt |
| one watt is equal to one joule per | second |
| which of the following is not a unit of power | N x m |
| which of the following is not a unit of power | kW x h |
| what is bought from an electric company | electrical energy |
| a killowatt- hour is a unit of power | joules per second |
| which of te following is not a scalar quantity | none of these |
| the average adult radiates heat energy at the same rate as | a 100 W light bulb |
| the largest reserve of energy in the united States is in what form | coal |
| currently, int he united states which of the fuel has the largest consumption | oil |
| currently in the united states which fuel is utilized to produce the majority of electrical power | coal |
| currently in the unites states which sector of the economy uses the most energy | industry |
| although the united states has less than 5% of the worlds population, it accounts for approximately _______ of the worlds annual consumption of fossil fuels. | 25% |
| Ice that burs is better known as | methane hydrate |
| which of the following are drawbacks to t eh use of methane hydrate as a fuel? | all of these are drawbacks associated with methane hydrate |
| one positive aspect of the potential use of methane hydrate as a fuel is that | there is more of it than there is coal, oil, and natural gas |
| is is estiated that the global reserve of methane hydrate _____ the global reserves of coal, oil and natural gas | twice |
| some food costs may rise in the future as a consequence of the increased use of which food- based fuel? | ethanol |
| a mixture of ethanol and gasoline is called | gasohol |
| for which of the following reasons is production of ethanol unwise | all of the above |
| which of the following sources of energy presents the fewest pollution problems? | hyrdoelectric power |
| energy provided directly from earths interior is called | geothermal energy |
| the process by which electricity can be gernerated by using running or falling water is known as | hydroelectric generation |
| a force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m, How much work is being done | 18 J |
| a stone is dropped from a bridge 15 m above a river. With what speed does the stone hit the water | 17 m/s |
| a student weighing 700 N climbs a flight of stairs 5.0 m high. Calculate the work done | 3500 J |
| A ball is dropped from an upper story dorm window. neglecting air resitsance, what is the speed of the ball when it has fallen 2.5 m | 7 m/s |
| a student with a 5.0 kg book bag on her way to class climbs two flights of stairs 9 a 10 m vertical distance) in 15 s. At what rate did the student do work in carrying the book bag up the stairs | 33 w |
| a force of 12 N act on a 2.0 -kg object through a parallel distance of 1.5 m. How much work is done on the object | 18 j |
| a 5.00 kg object is lifted from the floor to a shelf. The object new gravitational potential energy relative to the floor is 102 J What is he height of the shelf | 2.08 m |
| Car B is traveling twice as fast as car A, but car A has twice the mass of car B. Which car has the greater kinetic energy and by what factor is is greater | car b by a factor of 2 |
Created by:
helen16