A flat circular coil having 57 turns of very thin wire has a diameter of 9.5 cm and carries 7.2 A of current. (?0 = 4? × 10-7 T ? m/
A)
(a) What is the strength of the magnetic field at the center of the coil?
(b) If the same length of wire were used to make a coil with twice the original diameter, how large would the magnetic field at the center be when it carried the same current as before?
(a) 5.4 mT (b) 1.4 mT
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If a major asteroid collision in the asteroid belt occurs once every 100,000 years on average, then how many major collisions have occurred over the approximately 4.5 billion year history of the solar system?
A) about 45,000 B) about 4.5 million C) about 4.5 billion D) about 4500
How long was this exposure?
a. a few seconds
b. a few minutes
c. a few hours
d. a few days
e. a few weeks
A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 3.92 m/s2 B) 7.84 m/s2 C) 8.00 m/s2 D) 78.5 m/s2 E) 196 m/s2
A conducting sphere of radius 10.0 cm holds a net charge of 4.4 ?C. What is the surface charge density?
A. 0.0
B. 
C. 
D. 
E. 