Mrs. Daneshmand

When Alice’s car engine is started, gasoline is mixed with air and burned. Heat, sound, and chemical products are released. As the engine operates, which of these remains constant? A. the masses of compounds found in the engine B. the amount of heat in the engine C. the total mass of gasoline D. the total amount of energy Answer is : D

A. 10 km/h in the direction of bus A B. 20 km/h in the direction of bus B C. 15 km/h in the direction of bus A D. 10 km/h in the direction of bus B Answer is: A

Observer’s Descriptions 1Train is moving to the right at 100mph 2Train is moving to the left at 100mph 3Train is moving away from him at 100mph 4Train is moving towards him at 100mph What reason best explains the differences in observers’ descriptions? A. they are each observing a different train B. they are observing from different locations C. some observers have seats that are closer to the trains. D. some observers are moving while others are standing still. Answer is: B

What is the westward rate of motion of student 1 relative to the ground? A. 8km/h B. 12 km/h C. 20 km/h D. 32 km/h Answer is: A

A. 300 J B J C J D. 30,000 J Answer is: C

A. Double each charge and double the distance between the charges B. Double each charge and half the distance between the charges. C. Halve each charge and double the distance between the charges. D. Halve each charge and have the distance between the charges. Answer is: B

A. the Doppler effect B. the Compton effect C. a change in medium D. a change in speed Answer is: A

A. momentum B. power C. pressure D. work Answer is: D

A. Material A is an excellent insulator and Material B is an excellent conductor. B. Material A is an excellent conductor and Material B is an excellent insulator. C. Material B is a poor conductor and Material B is an excellent insulator. D. Material A is an excellent conductor and Material B is a poor insulator. Answer is: B

A. a strong gravitational field that is constant B. a strong magnetic field that is constant C. a weak gravitational field that is increasing in strength D. a weak magnetic field that is increasing in strength Answer is: D

What is the velocity of the two connected objects after the collision? A. 0 m/s B m/s C. 25 m/s D. 50 m/s Answer is: B

A. increased friction B. greater momentum C. greater acceleration D. more constant velocity Answer is: B

Which statement best describes how this inclined plane helps the driver of the vehicle? A. it changes the direction of the force needed to slow the vehicle B. it changes the size of the force needed to move the vehicle C. it increases the distance required to move the vehicle D. it increases the force required to slow the vehicle Answer is: A

A. thermal B. chemical C. electrical D. mechanical Answer is: D

A. kinetic B. potential C. chemical D. electrical Answer is: A

The observations indicate which general rule about series circuits? A. the sum of resistance and current is a constant B. resistance consumes more energy than current D. current generates more electrons than resistance D. resistance and current are inversely proportional Answer is D Circuit Investigation Resistance (in ohms) Current (in amperes)

What is the current in this circuit? A A B. 4.0 A C. 6.0 A D. 16 A Answer is: B

When measured from the same reference point, which point in the circuit is at the highest voltage? A. Point A B. Point B C. Point C D. Point D Answer is: B

A. the wavelength of a wave is measured from crest to crest B. waves travel uniformly outward from the wave source C. the frequency of waves varies in different mediums D. waves most at the same speed in different materials Answer is: B

Which statement correctly describes the motion of the road sign as seen from Andy’s frame of reference: A. the road sign appears to accelerate 2 m/s² toward the east B. the road sign appears to accelerate 2 m/s² toward the west C. the road sign appears to move at a constant 2 m/s to the east D. the road sign appears to move at a constant 2 m/s to the west Answer is: D

From whose perspective would the car have the greatest velocity? A. driver of the truck B. driver of the motorcycle C. pedestrian on the sidewalk D. person sitting on the bench Answer is: B

A. 1.2 joules B. 20 joules C. 120 joules D. 220 joules Answer is: B

Immediately after the insulated rod is removed, Object 1 and Object 2 repel. What causes the two objects to repel? A. object 2 is charged by induction and objects 1 and 2 are repelled by conduction B. object 2 is charged by conduction and objects 1 and 2 are repelled by conduction C. object 2 is charged by induction and objects 1 and 2 are repelled by induction D. object 2 is charged by conduction and object 1 and 2 are repelled by induction Answer is: D

Answer is: B

When the motor is connected to a battery, the loop rotates. When the motor is disconnected, the loop stops rotating. Which of these statements best explain why the loop only turns when the motor is connected to a battery? a.The battery moves electrons in the permanent magnets to build an electric field b.B. the battery causes the loop to conduct electricity through the magnets c.C. the battery moves electrical charges through the loop creating a magnetic field d.D. the battery pushes protons through the commutator, causing magnetism e.Answer is: C

What is their speed after colliding? A m/s B m/s C m/s D m/s Answer is 2.75 m/s

What is the velocity of sphere 2 after the collision? A. 1 m/s to the left B. 2 m/s to the right C. 4 m/s to the right D. 8 m/s to the left Answer is: C

If the books are removed from each box to reduce the mass to one-half the original mass, how far apart must the foxes be placed to keep the gravitational force between the two boxes constant? A. 1 meter B. 2 meters C. 8 meters D. 16 meters Answer is: B