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
You might also like to view...
If a conductor is in electrostatic equilibrium near an electrical charge:
a. the total charge on the conductor must be zero. b. the electric field inside the conductor must be zero. c. any charges on the conductor must be uniformly distributed. d. the sum of all forces between the conductor and the charge must be zero.
Which of the following is not a meson?
a. the muon b. the pion c. the kaon d. All of the above are mesons.
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.
Natural processes tend to increase the __________ of thermodynamic systems
a. temperature c. Carnot efficiency b. internal energy d. entropy