Which of these is not accelerating?
A) a car starting up from rest
B) a car while it is moving at unchanging speed up a straight [or steady] incline
C) a car going over the crest of a rounded hill at a constant speed
D) a car while it is rounding a corner at constant [or steady] speed
E) actually all of these cars are accelerating
B
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Give an example of an object having a velocity but no acceleration
A book of mass m is projected with a speed v across a horizontal surface. The book slides until it stops due to the friction force between the book and the surface. The surface is now tilted 30°, and the book is projected up the surface with the same initial speed v. When the book has come to rest, how does the decrease in mechanical energy of the book-Earth system compare to that when the book
slid over the horizontal surface? 1.It's the same. 2.It’s larger on the tilted surface. 3.It’s smaller on the tilted surface. 4.More information is needed.
Two springs are hung from a ceiling and carry identical masses. The first spring has a spring constant twice as large as the second spring. The masses on each spring are pulled down from their equilibrium positions the same distance and are then released. The amplitude of the oscillation is
A. larger for the second spring. B. It is not possible to know which is larger without knowing the mass C. larger for the first spring. D. the same for both springs.
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?