Stars of what magnitude are just barely visible to the unaided eye?
a. 4
b. 6
c. 2
d. 0
b
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The reflection of light from a rough surface is called specular reflection
Indicate whether the statement is true or false
To determine the location of the center of mass of a car, the car is driven over a scale on a horizontal floor
When the front wheels are over the scale, the weight recorded by the scale is 5800 N, and when the rear wheels are over the scale, the scale reads 6500 N. The distance between the front and rear wheels is measured to be 3.20 m. How far behind the front wheels is the center of mass located? A) 0.845 m B) 1.50 m C) 1.59 m D) 1.69 m E) 1.72 m
Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the small block on the large block?
a.
0.48 N to the right
b.
0.72 N to the right
c.
0.72 N to the left
d.
0.48 N to the left
e.
0.65 N to the left
What does E0 = mc 2 describe?
a. The kinetic energy of an object of mass m moving at speed v. b. The kinetic energy of an object of mass m moving at speed c. c. The equivalence of mass and energy. d. The form taken by Newton's second law at relativistic speeds. e. The relativistic mass.