The work done by static friction can be:
a. positive.
b. negative.
c. zero.
d. Any of the above.
D
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A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at at 15° north of east just after the collision, how fast was the car initially traveling?
A) 14 m/s B) 7 m/s C) 28 m/s D) 11 m/s
Thin Lenses: How far from a converging lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
Fill in the blank(s) with the appropriate word(s).
Cart A with momentum p (in magnitude) and speed 2v collides with cart B at rest. After the collision, cart A has speed v and cart B has speed 3v, as shown. What can you say about the momentum of cart B after the collision?
In a star, the balance between the inward force of gravity and the outward force of thermal and radiation pressure is called
a. the neutrino bonding point. b. hydrostatic equilibrium. c. the plasma equality condition. d. strong nuclear binding.