Impulse: A forklift pushes a 100-kg crate, starting from rest, with a horizontal force of magnitude F. The graph in the figure shows the x component of this force as a function of time. What is the instantaneous velocity of the crate at time t = 10 s?
A. 25 cm/s
B. 0.00 cm/s
C. 75 cm/s
D. -25 cm/s
E. -75 cm/s
Answer: E
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A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 30.0 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 0.0
The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true? I. Sheat has a surface temperature less than the Sun. II. Sheat has a diameter that is greater than that of the Sun. III. Sheat is more luminous than the Sun. IV. Sheat is located near the upper left-hand corner in the H-R diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
Distinguish between longitudinal and transverse waves