If a car slows down with the wheels rolling, is the frictional force between the tires and the ground kinetic or static?
A) kinetic
B) static
B
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The superposition of two waves, 
and 
,results in a wave with a wavelength of
A.
m.B.
C.
D.
E.
A mass of 0.40 kg, hanging from a spring with a spring constant of 160 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through a point at 0.05 m displacement? The starting displacement of the mass is 0.10 m from its equilibrium position
a. zero c. 1.7 m/s b. 1.4 m/s d. 1.2 m/s
A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
How long between the evolution of single versus multicellular organisms?
A) 4.5 billion years B) 2.5 billion years C) one billion years D) 600 million years E) 63 million years