A uniform hollow spherical ball of mass 1.75 kg and radius 40.0 cm rolls without slipping up a ramp that rises at 30.0° above the horizontal. The speed of the ball at the base of the ramp is 2.63 m/s
While the ball is moving up the ramp, find (a) the acceleration (magnitude and direction) of its center of mass and (b) the friction force (magnitude and direction) acting on it due to the surface of the ramp.
(a) 2.94 m/s2 down the ramp (b) 3.43 N up the ramp
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Four equal negative point charges are located at the corners of a square, their positions in the xy-plane being (1,1), (?1,1), (?1,?1), (1,?1). The electric field on the x-axis at (1,0) points in the same direction as
A) i^ B) j^ C) -i^ D) -j^
Explain how we can estimate the geological age of a planetary surface from its number of impact craters
What will be an ideal response?
Three-dimensional viewing was popular in the past with slide projectors. If the slides for left and right positions in the stereo projector are duplicates of each other
A) depth can be seen. B) no depth can be seen. C) only parallax can be seen.
An ohm is equal to which of these?
A. A Coulomb per second B. A volt C. A volt per ampere D. An ampere per second