pH of an Alkaline Soil
What will be an ideal response?
Greater than 7
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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?
A candle is 49.0 cm in front of a concave spherical mirror of radius of curvature 70.0 cm. What are the image distance and the magnification, respectively?
a. -20.4 cm, +0.417 c. +20.4 cm, -0.417 b. +122.5 cm, -2.50 d. +122.5 cm, +2.50
Converging mirrors
A. Will reflect parallel light rays to the focal point of the mirror. B. Will cause parallel light rays to spread out. C. Will reflect parallel light rays back along their original path D. Will scatter parallel light rays in random directions.
As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged. B) the normal force becomes less. C) friction needed to keep it at rest increases. D) all of the above E) none of the above