A projectile is fired at an angle of elevation of 30°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 160° and 40°
b. 20° and 70°
c. 90° and 30°
d. none of the above
e. 10° and 30°
c
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You stand on a scale that rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity
A. N > mg
B. N = mg
C. N
Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are doubled and their separation is also doubled, then what happens to the electrical force between these two charges?
A) It is doubled. B) It changes by a factor of 3. C) reduced by a factor of . D) It is quadrupled. E) It remains the same.
The electric field of a point charge has an inverse _____ behavior
a. r3 c. r b. r2 d. r1/2
What condition or conditions is/are necessary for rotational equilibrium?
A) ?Fy = 0 B) ?Fx = 0, ?Fy = 0 C) ?? = 0 D) ?Fx = 0 E) ?Fx = 0, ?Fy = 0, ?? = 0