Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0° with the horizontal and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which a 60.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
a. 5550 J
c. 8150 J
b. 6550 J
d. 13,100 J
A
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The term age of mammals is sometimes used to refer to the ______________ era
Fill in the blank(s) with correct word
Which form of radiation has the lowest frequency?
a. gamma b. microwave c. ultraviolet d. infrared e. visible
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
a. 1.1 N/C b. 4.5 N/C c. 1.4 N/C d. 5.6 N/C e. 0.50 N/C
A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 30 m/s in the positive x direction and is passing through the origin. Determine the maximum distance beyond x = 0 the particle travels in the positive x direction.
A. 25 m B. 20 m C. 15 m D. 30 m E. 60 m