A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
a. 15
b. 25
c. 50
d. 100
e. ?15
b
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This photo shows a carnival ride called a Rotor. If you had a second Rotor that spins at the same rate as the one pictured, but has a smaller diameter, the centripetal force on the people by the wall would be: (Hint: This is similar to the space station discussed at the bottom of page 168.)
a. larger than the centripetal force in the Rotor pictured. b. the same as the centripetal force in the Rotor pictured. c. smaller than the centripetal force in the Rotor pictured.
________ are remnants of low-mass stars.
A. White dwarfs B. Pulsars C. Black holes D. Neutron stars
A coil with a self-inductance of 6 H has a constant current of 2 A flowing through it for 2 seconds. What is the emf induced in this coil?
A) 6 V B) 12 V C) 0 V D) 4 V E) 8 V
What statement below best describes the behavior of light encountering the objective lens of a refracting telescope?
a. All light is absorbed as it travels through a dense, transparent material. b. White light from astronomical objects is emitted by the lens. c. Light rays are focused to form an image after they pass through the lens. d. Light rays are focused to form an image after they reflect off the lens.