Physics Midterm
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Question 1
- Estimate the average power output of the Sun, given that about 1350 W/m2 reaches the upper atmosphere of the Earth. The distance from the Sun to the Earth is 1.5 × 1011 m.
A. | 1 × 1026 W | |
B. | 4 × 1026 W | |
C. | 3 × 1026 W | |
D. | 2 × 1026 W |
Question 2
- A flux of 4.0 × 10-5 Wb is maintained through a coil for 0.50 s. What emf is induced in this coil by this flux?
A. | 4.0 x 10-5 V | |
B. | No emf is induced in this coil. | |
C. | 2.0 x 10-5 V | |
D. | 8.0 x 10-5 V |
Question 3
- A beam of light traveling in air is incident on a transparent plastic at an angle of incidence of 50o. The angle of refraction is 35o. What is the index of refraction of the plastic?
A. | 1.56 | |
B. | 1.43 | |
C. | 1.34 | |
D. | 1.67 |
Question 4
- A concave mirror with a radius of 30 cm creates a real image 40 cm from the mirror. What is the object distance?
A. | 70 cm | |
B. | 10 cm | |
C. | 5.0 cm | |
D. | 24 cm |
Question 5
- A long, straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from the wire.
Question 6
- If the force between two charges increases by a factor of 16 because the charges are moved closer together, how much closer are they moved?
A. | 8 | |
B. | 4 | |
C. | 2 | |
D. | 16 |
Question 7
- See the figure. The net force on the 1 nC charge is zero. What is q?
A. | 8.0 nC | |
B. | zero | |
C. | 0.68 nC | |
D. | 16 nC |
Question 8
- If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds?
A. | 2.3 x 1020 e | |
B. | 9.2 x 1020 e | |
C. | 1.5 x 1020 e | |
D. | 1.9 x 1020 e |
Question 9
- Starting from rest, a proton falls through a potential difference of 2700 V. What speed does it acquire?
A. | 7.2 × 105 m/s | |
B. | 2.4 × 105 m/s | |
C. | 3.6 × 105 m/s | |
D. | 4.8 × 105 m/s |
Question 10
- Which of the equations here is valid for the circuit shown?
A. | 2 - 2I1 - 2I2 - 4I3 = 0 | |
B. | 4 - I1 + 4I3 = 0 | |
C. | 6 - I1 - 2I2 = 0 | |
D. | -2 - I1 + 4 - 2I2 = 0 |
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