When an oscillator is driven in resonance,
a. there are no standing waves.
b. any driving frequency may be used.
c. all natural frequencies are present.
d. there is maximum energy transfer.
d
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A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen
Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?
What type of rocket engine is used by the Space Shuttle?
A) chemical rocket B) nuclear rocket C) matter-antimatter rocket D) ramjet E) beamed energy propulsion
What is oxidation?
A) the loss of electrons B) the reaction with oxygen C) the reduction of oxygen D) the gaining of electrons E) the addition of an electron to the valence shell
A converging lens with two convex surfaces has a front surface with radius of curvature of 13.1 cm; the back surface has radius of curvature of 16.5 cm, and it is made from material with an index of refraction of 2.10 . What is the focal length of the lens?
a. 6.64 cm b. 57.8 cm c. ?57.8 cm d. 3.48 cm e. 30.3 cm