The coefficients of static and kinetic friction between a 3.0-kg box and a horizontal desktop are 0.40 and 0.30, respectively. What is the force of friction that the desktop exerts on the box when a 15-N horizontal push is exerted on the box?
A) 12 N
B) 8.8 N
C) 15 N
D) 6.0 N
E) 4.5 N
B
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When light from air hits a smooth piece of glass (n = 1.5) with the ray perpendicular to the glass surface, which of the following will occur?
a. reflection and transmission with ?2 = 0° b. refraction with ?2 = 41.8° c. interference d. All of the above will occur.
If a conductor is in electrostatic equilibrium near an electrical charge:
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a. temperature c. Carnot efficiency b. internal energy d. entropy