A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A) 16 cm
B) 17 cm
C) 18 cm
D) 19 cm
C
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Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground. b. has a wavelength that is longer than the visible light emitted by the star. c. has a wavelength that is shorter than the x-rays emitted by the star. d. a and b e. b and c
Two capacitors with capacitances of 1.5 mC and 0.25 mF, respectively, are connected in parallel. The system is connected to a 40-V battery. What charge accumulates on the 1.5-mF capacitor?
a. 100 mC c. 60 mC b. 75 mC d. 33 mC
The motion of a piston in an auto engine is simple harmonic. If the piston travels back and forth over a distance of 10 cm, and the piston has a mass of 1.5 kg, what is the maximum speed of the piston and the maximum force acting on the piston when the engine is running at 4 200 rpm?
Simple harmonic oscillations can be modeled by the projection of circular motion at constant angular velocity onto a diameter of the circle. When this is done, the analog along the diameter of the acceleration of the particle executing simple harmonic motion is
a. the displacement from the center of the diameter of the projection of the position of the particle on the circle. b. the projection along the diameter of the velocity of the particle on the circle. c. the projection along the diameter of tangential acceleration of the particle on the circle. d. the projection along the diameter of centripetal acceleration of the particle on the circle. e. meaningful only when the particle moving in the circle also has a non-zero tangential acceleration.