For what position of the object will a spherical concave mirror project on the screen an image smaller than the object? a. between focus and center
b. between the focus and the mirror
c. at the center of curvature
d. beyond the center of curvature

Which of the following represents an upside-down image?

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.