A concave spherical mirror with a radius of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A) 50 cm B) 5.0 cm C) 20 cm D) 15 cm E) 7.5 cm
D
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An ideal transformer has an input voltage of 20,000 V and an output voltage of 260 V. If the input current is 26.0 A, what is the output current?
A. 1.70 A B. 10.0 A C. 100 A D. 200 A E. 2000 A
The mass of a visual binary pair of stars can be obtained from
a. the time in years for them to orbit one another. b. the size of their orbit. c. their apparent magnitudes. d. both the time in years for them to orbit one another and the size of their orbit.
A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed. The object falls with an acceleration of 4.00 m/s2 downward when it is falling downward at 70.0 m/s. What is its terminal speed?
A) 110 m/s B) 157 m/s C) 91.0 m/s D) 172 m/s E) 108 m/s
Why do the predicted consequences of the special theory of relativity seem so strange to most of us?
A) because they are self-contradictory, making it impossible to make any sense of them B) because they are obvious only at speeds that we never experience in our daily lives C) because they contradict the well-tested ideas of Newton's laws of motion D) because they affect only subatomic particles and not big things like people