Physics FINAL

1.

1 point

During a dart throwing experiment, 5 out of 6 darts land at the bottom of the target. Which of the following statements best describes the situation?

The board is a little higher than regulation, causing a systematic error.

I am bumped as I release some of the darts, causing random error.

My Results lack precision.

More information is needed to make a claim.

2.

1 point

Which of the following is NOT a significant figures rule?

During a conversion, express your answer to the same number of significant figures as the number you start with.

When adding two numbers, keep the total number of significant figures as the number with least significant figures.

When multiplying two numbers, keep the total number of significant figures as the number with least significant figures.

When expressing a number in scientific notation, keep the same number of significant figures as the original number.

3.

1 point

Given: 1 furlong = 660 ft and 1 mile = 5208 ft, Convert 1 furlong/day to miles/hour

1.20 x 10^-8 miles/hour

3 miles/hour

.005 miles/hour

.333 miles/hour

4.

1 point

Which of the following statements is true?

Some scalars can be depicted by an arrow with velocity and direction

All vectors can be depicted by an arrow with velocity and direction

Scalars can be depicted graphically with magnitude and direction

Vectors can be depicted graphically with magnitude and direction

5.

1 point

A train travels southeast from the station. If the train passes the 30.1 mile marker and the 175.5 mile marker in a time span from 21.7 minutes to 105.2 minutes, what was the average velocity of the train?

.574 mi/hr @ 225 degrees

.574 km/hr @ 315 degrees

105 km/hr @ 225 degrees

105 mi/hr @ 315 degrees

6.

1 point

Punxsutawney Phil (a famous groundhog) walks 6.25 feet north from his hole, turns around, walks 13.45 feet south, and backpedals north 8.35 feet. The total time is 7 minutes. What is his distance traveled?

15.56 feet

28.05 feet

1.15 feet

11.35 feet

7.

1 point

Punxsutawney Phil (a famous groundhog) walks 6.25 feet north from his hole, turns around, walks 13.45 feet south, and backpedals north 8.35 feet. The total time is 7 minutes. What is the displacement?

15.56 feet @ 90 degrees

28.05 feet @ 180 degrees

1.15 feet @ 90 degrees

11.35 feet @ 180 degrees

8.

1 point

A firework is launched from the Henley Street Bridge straight up at 53.6 m/s. It does not explode and returns to the bridge.

10.92 seconds

5.46 seconds

43.79 seconds

9.81 seconds

9.

1 point

Vector A has a direction of 237 degrees. Which of the following best describes vector A?

It has a positive x-component and positive y-component

It has a positive x-component and negative y-component

It has a negative x-component and negative y-component

It has a negative x-component and positive y-component

10.

1 point

A boy on a ladder aims his "Nerf" dart gun straight at the chest of a second boy hanging from a tree branch 5 meters away. At the instant the boy on the ladder fires is dart, the boy on the branch drops. With no air resistance, what happens?

Dart goes over dropping boy's head

Dart hits the dropping boy's chest

dart goes under dropping boy's feet.

dart hits the dropping boy's head

11.

1 point

Vector A= 20m @ 90 degrees and Vector B= 15m @ 90 degrees. What is the resultant of Vector B - Vector A?

5 m @ 270 degrees

35 m @ 270 degrees

5 m @ 90 degrees

35 m @ 90 degrees

12.

1 point

A guy throws a baseball horizontally into a canyon with initial velocity of 37 m/s. How long will it take for the ball to hit the canyon floor 1609 m below?

36.22 seconds

15.3 seconds

18.11 seconds

9.81 seconds

13.

1 point

A human cannon ball launches with initial velocity of 27.6 m/s at 43.5 degrees and lands in a net on the same level as the cannon. What is the range of the human cannon ball (how far away is the net from the cannon?)

38.8 m

56.8 m

100 m

77.6 m

14.

1 point

A net force (F) accelerates a mass (m) with an acceleration (a). If the same net force is applied to a mass (m/2) the acceleration would be?

4(a)

2(a)

(a)/2

(a)/4

15.

1 point

A box is sliding on a frictionless surface and is stopped by a brick wall. If the box hits the brick wall with a force of 6512 N, what is the force applied on the box as it hits the brick wall?

slightly less than 6512 N

3.00(m)(a)

2.00(F)(v)

Exactly 6512 N

16.

1 point

A 92.0 kg block is pushed across a frictionless table with force of 97.6 N at 0 degrees. What is the acceleration of the block?

8979.2m/s^2

1.06 m/s^2

.943 m/s^2

-9.81 m/s^2

17.

1 point

A traffic light hangs from wires that form 37 degree angles with the top of the light. If the traffic light weighs 100N, what is the magnitude of the tension in each rope?

100 N

30.09 N

50 N

83.08 N

18.

1 point

The Moon revolves around the Earth. What keeps it in motion around Earth?

The centripetal force of Earth is slightly off-center

The gravitational force of Earth is greater than that of the Moon

The centripetal acceleration of the two masses is the same

The tangential velocity of the Moon and the Gravitational Field strength of Earth

19.

1 point

Which of the following correctly describes the interaction between the Earth and Moon according to Newton's Law of Universal Gravitation?

The moon attracts the Earth with the same force that Earth attracts the Moon

The force between the moon and the earth is different for each object

The moon attracts the earth with less force than the Earth attracts the Moon.

The Moon attracts the Earth with more force than the Earth attracts the Moon

20.

1 point

Two stars in space are 1.2 x 10^7 m apart and have masses of 2.5 x 10^24 kg and 3.5 x 10^26 kg. What is the gravitational force between them?

4.87 x 10^33 N

4.05 x 10^26 N

5 N

4.85 x 10^50 N

21.

1 point

Increasing the area (width) of a current carrying wire, causes the resistance to ____

remain the same

increase

decrease

unable to predict unless length of wire is known

22.

1 point

Light bulbs A and B have wattages of 60W and 100W. If both bulbs have same operating voltage, which is true about their resistances?

Bulb A has greater resistance than Bulb B

Bulb A has lower resistance than Bulb B

Resistance of a light bulb is not related to wattage

Both bulbs have same resistance.

23.

1 point

a PROTON is traveling eastward close to the surface of Earth. Assuming that earth's magnetic field is pointing North, the direction of the magnetic force on the proton is____

Upward

Downward

East

South-East

24.

1 point

A PROTON moves straight upward (away from ground) through a magnetic field that points west with a magnitude of 2.5 T. If proton moves with speed of 1.5 x 10^7 m/s and has a charge of 1.60 x 10^-19 C. What is the magnitude and direction of the Force?

6.0 x 10^-12 N North

3.8 x 10^ 5 N East

6.0 x 10^-12 N South

3.8 x 10^ 5 N West

25.

1 point

A container with mass 5 kg is lifted 8 m above the ground. What is the work done by gravity?

400 J

-400 J

zero

50 J

-50 J

26.

1 point

A container with mass 5 kg is lifted 8 m above the ground. What is the work done by applied force?

400 J

-400 J

zero

50 J

-50 J

27.

1 point

A container with mass 5 kg is lifted 8 m above the ground and then returned back to the ground. What is the net work done by gravity?

400 J

-400 J

zero

50 J

-50 J

28.

1 point

A truck driver is trying his best to push a truck. After 50 minutes, and over 500 N of force later, the truck hasn't moved. How much work has been done?

500 J

-500 J

10 J

-10 J

zero

29.

1 point

In science, work is defined by:

the mass of an object multiplied by its acceleration.

the mass of an object multiplied by the force required to move it

force multiplied by the distance moved in a direction perpendicular to the force.

force multiplied by the distance moved in a direction parallel to the force.

none of the above

30.

1 point

How much power is necessary to do 50 J of work in 5 seconds?

5 W

10 W

50 W

250 W

none of the above

31.

1 point

An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object’s gravitational potential energy is approximately

.310 J

.32 J

3.3 J

.34 J

32.

1 point

As an object from some initial height falls freely, its kinetic energy

increases

decreases

remains constant

not enough info

33.

1 point

A skateboarder is standing at the top of the half pipe (point A), he drops down and skates up to the other side (equally as high) (Point B). Which of the following most accurately describes energy at Point B? Assume no friction.

Potential Energy is slightly lower than starting, Kinetic Energy is zero

Potential Energy is zero, Kinetic Energy is Max

Potential Energy is at a Max, Kinetic Energy is at zero.

not enough info

34.

1 point

A skateboarder is standing at the top of the half pipe (point A), he drops down and skates up to the other side (equally as high) (Point B). When the skateboarder is at the bottom of the ramp, before going back up, (Point C) Which of the following most accurately describes energy at Point C? Assume no friction.

Potential Energy is slightly lower than starting, Kinetic Energy is zero

Potential Energy is zero, Kinetic Energy is Max

Potential Energy is at a Max, Kinetic Energy is at zero.

not enough info

35.

1 point

If a 10 kg object on a 5 m ladder falls straight down, what will be the KE as it hits the ground?

245.25 J

98.1 J

50 J

490.5 J

36.

1 point

If a 10 kg object on a 5 m ladder falls straight down, what will be the velocity as it hits the ground?

98.1 m/s

9.9 m/s

4.95 m/s

15 m/s

37.

1 point

Determine the Total Resistance of the given circuit

10 ohms

3.333 ohms

.968 ohms

4 Amps

38.

1 point

Which of the following is the correct voltage and current reading over Resistor B?

12 V and 4 A

12 V and 6 A

3.6 V and 12.4 A

3.6 V and 1.2 A

39.

1 point

Determine the resistance of the given circuit

.968 ohms

10 ohms

3.333 ohms

6 Amps

40.

1 point

Which of the following is the correct voltage and current over Resistor C?

4 V and 1.2 A

9 V and 3 A

9 V and 4.5 A

9 V and 1.80 A