Physics Final

What is the charge of an electron?

-1.6 x 10^-19

A basketball player jumped straight up to grab a rebound. If she was in the air for a total of 0.6 seconds, how high did she jump? (d=½at2)

0.44m

A moving electron is deflected by two oppositely charged parallel plates, as shown in the diagram below. The electric field between the plates is directed from

C to D

True or False. As the distance between two charged objects increases, the strength of the electrostatic force between them decreases, and thus shows a direct relationship between distance and force.

False

True or false. An object that is traveling eastward and slowing down, will have a momentum that is directed westward

False

True or false. Power is a form of mechanical energy.

False

When a rod is brought near a neutral electroscope, the leaves diverge. Which statement best describes the charge on the rod?

It may be positive or negative

The diagram below represents two concurrent forces acting on a point. Which vector best represents their resultant?

Pointing to the right corner

As the pendulum swings from position A to position B as shown in the diagram below, what is the relationship of kinetic energy to potential energy? [Neglect friction.]

The kinetic energy increase is equal to the potential energy decrease

As an object free-falls, its gravitational potential energy is decreased, its kinetic energy is increased, and its total mechanical energy remains unchanged.

True

True or False- In a parallel circuit, when one bulb burns out the other bulbs are not affected. Bulb two in the circuit still has the same current, the same volts, and the same resistance. Therefore, bulb two must also have the same brightness.

True

True or False. Charges can only occur in multiples of 1.6 x 10-19, the magnitude of charge of an electron.

True

True or False. Electrostatic force is the force of attraction between opposite charges.

True

True or false. Accelerating objects must either be changing their speed or changing their direction

True

True or false. In a parallel circuit, the potential difference (V) is the same in all parts of the circuit and also is the same as the total number of volts.

True

True or false. Inertia is the tendency of all objects to resist a change in motion.

True

A circuit has a source of potential difference, a resistance, and

a wire

A man standing on a scale in an elevator notices that the scale reads 30 newtons less than his normal weight. Which type of movement of the elevator could cause this less- than-normal reading?

accelerating downward

Spheres X, Y, and Z are metal conducting spheres in contact on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

all pos. X- all neg; Y- half neg half pos; Z- all pos

The diagram below shows a worker using a rope to pull a cart. The cart moves a given distance. The worker's pull on the handle of the cart can best be described as a force having

both magnitude and direction

According to the Physics reference table, Approximate Coefficients of Friction, which road surface would offer the greatest traction for rubber tires?

dry concrete

The number of electrons that pass a certain point in a conductor in a given amount of time is defined as

electric current

At what point in its fall does the kinetic energy of a freely falling object equal its potential energy?

halfway between the start and the end

If the time required for a student to swim 500 meters is doubled, the power developed by the student will be

halved

Potential energy is measured in units of

kg x m2/s2

The two factors that determine the amount of kinetic energy in an object are ____________________ and ____________________.

mass and velocity

Compared to the potential drop across the 8 ohm resistor, the potential drop across the 4 ohm resistor

one half as great

If the resistance of a circuit is doubled and the voltage remains unchanged, the current flowing in the circuit will be

one-half as much

In the figure, potential energy is being converted into kinetic energy from

point A to point B

In the figure, kinetic energy is being converted into potential energy from

point B to point C

Which one of the following shows correct electric field lines?

positives going into each other

Which diagram best illustrates the electric field around two unlike charges?

positives going into negatives

There is a statue at the top of a tower that is 45 m high. The statue weighs 200 N. What type and how much energy does the statue have?

potential and 9000 J

As the car moves from point A , to point B, and finally to point C, the total energy of the car

stays the same, but is converted between potential and kinetic energy

A mosquito flying over a highway strikes the windshield of a moving truck. Compared to the magnitude of the force of the truck on the mosquito during the collision, the magnitude of the force of the mosquito on the truck is

the same

The diagram below represents a 2.0-kilogram mass placed on a frictionless track at point A and released from rest. Assume the gravitational potential energy of the system to be zero at point E. Compared to the total mechanical energy of the system at point A, the total mechanical energy of the system at point F is

the same

Energy is measured in the same units as

work

A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The energy gained by the block is equal to the

work done on the block

The diagram below represents a 155-newton box on a ramp. Applied force F causes the box to slide from point A to point B. What is the total amount of gravitational potential energy gained by the box?

279.0 J

Two metal spheres having charges of +4.0 x 10-6 coulomb and +2.0 x 10-6 coulomb, respectively, are brought into contact and then separated. After separation, the charge on each sphere is

3.0 x 10^-6

The diagram below represents a circuit consisting of two resistors connected to a source of potential difference. What is the current through the 20 ohm resistor?

4.0 A

Two metal spheres having charges of +4.0 x 10-6 coulomb and +4.0 x 10-6 coulomb are brought into contact and then separated. After separation, the charge on each sphere is

4.0 x 10-6 C

At what constant speed can a 2,000-watt motor working at full capacity vertically lift a 400-newton weight?

5 m/s

If 20 joules of work is done in 4.0 seconds, the power developed is

5.0 watts

In raising an object vertically at a constant speed of 2.0 meters per second, 10 watts of power is developed. What is the weight of the object?

5.0,N

The magnitude of the force that a baseball bat exerts on a ball is 50 Newtons. According to Newton's Third Law, the magnitude of the force that the ball exerts on the bat is

50N

Gravitational force F exists between point objects A and B separated by distance R. What is the universal gravitational constant?

6.67 x 10^-11

How much work is done when a rock weighing 10 Newtons is lifted a vertical distance of 8 meters at 2 meters per second?

80J

If the speed of a car is tripled, the kinetic energy of the car is

9 times the original KE

What is the potential energy of a stone that weighs 60 newtons when it is sitting on top of a wall 15 meters high?

900J

A 10 kg box is resting on a horizontal countertop surface. Calculate the magnitude of the normal force acting upon the box.

98.1N directed upward

A pendulum swings as shown in the diagram. At which position is the kinetic energy of the pendulum bob least?

A

A weightlifter lifts a 2,000-newton weight a vertical distance of 0.5 meter in 0.1 second. What is the power output?

1 x 104 w

At point P in an electric field, the magnitude of the electrostatic force on a proton is 2.50 x 10 -10 newton. What is the magnitude of the electric field intensity at point P?

1.5 x 10^9 N/C

How much work is required to move a single electron through a potential difference of 1000 volts?

1.6 x 10^-16 J

The weight of an object on Earth is 1.0 x 10^3 what is the mass of this object?

100 kg

A football player kicks a ball with an initial velocity of 25 meters per second at an angle of 53° above the horizontal. What is the horizontal component of the initial velocity of the ball?

15 m/s

The resultant of two forces acting on the same point at the same time will be a minimum when the angle between the forces is

180

A student walks 6.0 kilometer due east and 3.0 kilometer due south. Then she runs 6.0 kilometers due west and 3 kilometers due north. The magnitude of the student's total distance is closest to

18km

What is the current through a wire if 240 coulombs of charge pass through the wire in 2.0 minutes?

2.0 A