# SAT Physics

**(20 questions; 25 minutes)**

**Directions:**Choose the best answer. If you are not sure about the concept, please select “(E) I don’t really know” in each question.

**Note:**To simplify calculations, you may use g 10 m/s

^{2}= in all problems.

**Press "Next" to start.**

**(20 questions; 25 minutes)**

**Directions:**Choose the best answer. If you are not sure about the concept, please select “(E) I don’t really know” in each question.

**Note:**To simplify calculations, you may use g 10 m/s

^{2}= in all problems.

**Press "Next" to start.**

1. The radius of the Earth is 6370 kilometers. What is the radius of the Earth in meters?

(A) 6.370 m

(B) 6.370 x 10

^{3}m(C) 6.370 x 10

^{6}m(D) 6.370 x 10

^{-3}m(E) I don’t really know.

2. A car is travelling with the speed of 36 kilometers per hour. What is the car’s speed in meters per second?

(A) 10 m/s

(B) 36 m/s

(C) 130 m/s

(D) 600 m/s

(E) I don’t really know.

(A)

(B)

(C)

(D)

(E)

4. A runner finishes a 100-meter race within 10 seconds. What is the average speed of the run?

(A) 0.1 m/s

(B) 10 m/s

(C) 100 m/s

(D) 1,000 m/s

(E) I don’t really know

5. A train accelerates uniformly from rest and reaches the speed of 20 m/s within 10 seconds. What is the acceleration of the train?

(A) 2 m/s

^{2}(B) 10 m/s

^{2}(C) 100 m/s

^{2}(D) 200 m/s

^{2}(E) I don’t really know

(A)

(B)

(C)

(D)

(E)

7. In the above figure, the box of mass 30 kg is in equilibrium. If the tension in the left string is 100 N, what is the tension in the right string?

(A) 100 N

(B) 200 N

(C) 300 N

(D) 400 N

(E) I don’t really know.

(A) 4

(B) 15

(C) 25

(D) 100

(E) I don’t really know.

9. Peter pushes a box horizontally to the right as shown. If the force exerted by Peter is 200 N and the box moves a distance of 5 m, how much work is done by Peter on the box?

(A) 0 J

(B) 40 J

(C) 205 J

(D) 1000 J

(E) I don’t really know.

(A)

(B)

(C)

(D)

(E)

11. Mass times velocity is called ________.

(A) Force

(B) Kinetic Energy

(C) Momentum

(D) Moment

(E) I don’t really know.

(A) 1 x 10

^{9}N(B) 2 x 10

^{9}N(C) 3 x 10

^{9}N(D) 6 x 10

^{9}N(E) I don’t really know.

13. A 9-volt battery is connected to a 3-ohm resistor, how much does the current flow in the circuit?

(A) 3 amperes

(B) 6 amperes

(C) 27 amperes

(D) 0.33 amperes

(E) I don’t really know.

14. The total resistance between A and B is _______.

(A) 60 Ω

(B) 30 Ω

(C) 20 Ω

(D) 10 Ω

(E) I don’t really know.

15. The wavelength of the above wave is _______.

(A) 5 cm

(B) 7.5 cm

(C) 10 cm

(D) 15 cm

(E) I don’t really know.

(A) 30 cm

(B) 15 cm

(C) 10 cm

(D) 5 cm

(E) I don’t really know.

17. 25 °C = _____°F

(A) 25

(B) 32

(C) 64

(D) 77

(E) I don’t really know.

(A) 400 cal

(B) 600 cal

(C) 800 cal

(D) 1000 cal

(E) I don’t really know.

(A) 2 protons, 2 neutrons

(B) 2 protons, 4 neutrons

(C) 2 protons, 2 electrons

(D) 2 protons, 4 electrons

(E) I don’t really know.

20. Iodine-131 is a radioactive isotope with the half-life of 8 days. If you have a sample of Iodine-131, how much of its content remains, in percent, after 24 days have passed?

(A) 75%

(B) 50%

(C) 25%

(D) 12.5%

(E) I don’t really know.

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