What is the speed of a proton in a cyclotron having a 0.50 T magnetic field when the proton is at a distance of 25 cm from the center?
a. 
b. 
c. 
d. 
e. 
b.
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Atoms are held together by
A) the electrostatic force of attraction between the protons in the nucleus and the surrounding electrons B) the combined electrostatic force of attraction between the protons and neutrons in the nucleus and the surrounding electrons C) the force of gravitational attraction between the protons in the nucleus and the surrounding electrons D) the electrostatic force of attraction between the neutrons in the nucleus and the surrounding electrons
An ideal gas is compressed isothermally from 30 L to 20 L. During this process, 6 J of energy is expended by the external mechanism that compressed the gas. What is the change of internal energy for this gas?
A) +6 J B) zero C) -6 J D) +12 J E) -12 J
What is the equivalent capacitance of the combination shown?
a.
20 ?F
b.
90 ?F
c.
22 ?F
d.
4.6 ?F
e.
67 ?F
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, and the coefficient of kinetic friction is 0.300
What is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck? A) 8.00 m/s2 B) 3.92 m/s2 C) 196 m/s2 D) 78.5 m/s2 E) 7.84 m/s2