66 Questions
| Total Attempts: 39

Review for physics 1210

Questions and Answers

- 1.A distance of 1*10^-9 km is equivalent to a distance of
- A.
1 nm

- B.
1 um

- C.
1 mm

- D.
.1 mm

- E.
None

- 2.What are the 3 basic units in the scientific system of units (SI system) we have used in class?
- A.
Miles, kilograms, seconds

- B.
Meters, kelvins, seconds

- C.
Miles, pounds, seconds

- D.
Meters, kilograms, seconds

- E.
Meters, kilograms, mi/hour

- 3.The speed of light is about 3.00x10^8 m/s. Whats the speed of light in miles/hour? (1 mile = 1609 meters)
- A.
6.71 x 18^8 miles/hr

- B.
1.34 x 10^8 miles/hr

- C.
3.00 x 10^8 miles/hr

- D.
186,000 miles/hr

- E.
None

- 4.All except one of the following require the application of a net force. Which ones the expection?
- A.
To change an object from a state of rest to a state of motion

- B.
To maintain an object in motion at a constant velocity

- C.
To change an objects speed w/out changing its direction of motion

- D.
To maintain an object in uniform circular motion

- E.
To accelerate an object

- 5.Consider a 50 kg person held up by a rope in the diagram shown. The tension in the rope is __________________________\\\\\\\\\\\\\\\\\ 0 /////////////////////
- A.
Equal to the persons weight

- B.
Half the persons weight

- C.
Between 250 and 500 N

- D.
Greater than 500 N

- E.
50 Kg

- 6.A rocket flies at constant velocity straight up. whats the direction of the net force on the rocket?
- A.
Up

- B.
Down

- C.
Can not be determined w/out knowing rocket mass

- D.
Cant be determined w/out knowing the wind resistance

- E.
None of the previous

- 7.A hot rod starting at rest and uniformly accelerating covers a distance of 400 meters in 15 seconds. What is the acceleration to two significant figures?
- A.
3.6 m/s^2

- B.
4.4 m/s^2

- C.
2.2 m/s^2

- D.
27 m/s^2

- E.
None

- 8.A ball is thrown up at 15 m/s, whats the velocity after 3.0 seconds?
- A.
14 m/s up

- B.
14 m/s down

- C.
44 m/s up

- D.
44 m/s down

- E.
None

- 9.A 20.0 kg block on a smooth horizontal surface is acted upon by two horizontal forces: a force of 20 N acting to the left and a force of 60 N to the right? The acceleration fo the block will be
- A.
3.0 m/s^2 to the right

- B.
4.0 m/s^2 to the right

- C.
40 m/s^2 to the right

- D.
2.0 m/s^2 to the left

- E.
None

- 10.Which of the following units would be approriate to describe force?
- A.
Kg*m/s^2

- B.
M/s^2

- C.
Kg/s

- D.
Kg*m/s

- E.
None

- 11.What is the magnitude of the accleration produced by a net force of 4500 N acting on a 900 kg automobile?
- A.
.20 m/s^2

- B.
3.8 m/s^2

- C.
5.0 m/s^2

- D.
9.8 m/s^2

- E.
None

- 12.A 150 lb student races up stairs with a vertical height of 3.0 m in 4.0 seconds to get to class on the second floor. how much power in watts does the student expend in doing work against gravity? (Hint: The equivalent weight of 1 kg mass = 2.2 lbs, so the students mass in kilograms 68 kg)
- A.
51 W

- B.
167 W

- C.
5.0 * 10^2 W

- D.
890 W

- E.
None

- 13.A 0.15 kg ball traveling with a speed of 50 m/s is brought to rest in a catcher's mitt with an average force of 75 N. What is the maginutde of the impulse exerted by the mitt on the ball?
- A.
75 Ns

- B.
11.3 Ns

- C.
3750 Ns

- D.
7.5 Ns

- E.
None

- 14.A 5.0-kg cat travels to the left at 10 m/s and a 10-kg dog travels to the right at 5.0 m/s. The total momentum is
- A.
125 kg m/s to the left

- B.
0

- C.
50 kg m/s to the right

- D.
100 kg m/s to the right

- E.
None

- 15.Money (US paper bill) was used in class to illustrate
- A.
How to convert between different units or denominations

- B.
Decimal, or powers of 10, notation

- C.
Using algebraic equations to describe word (finance) problems

- D.
Free fall

- E.
None

- 16.A child plays on a see-saw with her father. The child has a weight of 250 N and is seated 2.5 m from the axis of rotation. Her father balances her when he is seated 0.80 m from the axis. The fathers weight is
- A.
250 N

- B.
500 N

- C.
667 N

- D.
725 N

- E.
750 N

- 17.A book weighing 10 N is held at rest in the palm of the hand. The reaction to the force of the hand on the book is a force of
- A.
10 N exerted by the Earth on the book

- B.
10 N exerted by the book on the Earth

- C.
10 N exerted by the book on the hand

- D.
0 N

- E.
9/8 m/s^2 in the downward direction arising from the force of the eart

- 18.A ball is projected upward with an initial velocity of 5 m/s. It will reach its maximum height in approximately
- A.
0.5 s

- B.
1.0 s

- C.
49 s

- D.
2.0 s

- E.
0.0 s

- 19.The tablecloth pull demo (where objects remain on the table when the tablecloth is pulled out from under theM) was used in class to demonstrate
- A.
Conservation of momentum

- B.
Action and reaction

- C.
Conservation of energy

- D.
Newton's 2nd Law

- E.
Newton's 1st Law

- 20.A force of 40 N is applied at the end of a wrench that is 0.2 meters from the axis of the bolt. The direction of the force points along the legnth of the wrench. The magnitude of the torque created is
- A.
40 Nm

- B.
0.2 Nm

- C.
0.0 Nm

- D.
8 Nm

- E.
Angel of force on wrench must be given

- 21.A student, sitting on a stool rotating at a rate of 12 RPM, holds masses in each hand. When her arms are pulled in, the total rotational inertia of the system is 2.0 kg m^2. She then extends her arms form her body, increasing the total rotational inertia to 5.0 kg m^2. If there are no external torques, what is the new rotational velocity of the system?
- A.
30 RPM

- B.
60 RPM

- C.
4.8 RPM

- D.
12 RPM

- E.
None

- 22.If an astronaut landed on a planet that was three times the diameter and three times the mass of earth, how would his weight there compare with that on earth?
- A.
Same

- B.
Three times as much

- C.
One ninth as much

- D.
One third as much

- E.
None

- 23.The nucleus of an atom is made of
- A.
Protons

- B.
Neutrons

- C.
Electrons

- D.
Protons & electrons

- E.
Protons & neutrons

- 24.Consider a small 3-d model of uniform denisty but arbitrary shape with a mass of 2.0 kg. Now scale all dimensions of the mdoel up by a factor of 5. What would be the new model's mass?
- A.
2.0 kg

- B.
10 kg

- C.
50 kg

- D.
500 kg

- E.
250 kg

- 25.A hydraulic jack is used to lift a load of weight 2.0 x 10^3 N. The load-bearing cylinder has a radius of 4.0 cm, and the other piston has a radius of 1.0 cm. What force must be exerted on the smaller piston to support the load (2 sig figs)?
- A.
1.6 x 10^4 N

- B.
6.2 x 10 N

- C.
1.3 x 10^2 N

- D.
1.0 x 10^3 N

- E.
None