The work done by kinetic friction is equal to
A. ?Eth and fk*?x
B. ?Eth
C. fk*?x
D. None of these
Answer: A. ?Eth and fk*?x
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At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s b. 3.4 m/s c. 5.0 m/s d. 4.4 m/s e. 4.6 m/s
Which of the following is not a component of a stream's load?
a. Mother load b. Dissolved load c. Suspended load d. Bed load
The ratio of the number of protons to neutrons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?
a. decreases with greater atomic number b. increases with greater atomic number c. remains constant for entire range of atomic numbers d. is maximum for atomic number = 60
A circular loop of wire of area 25 cm2 lies in the plane of the paper. An increasing magnetic field B is coming out of the paper. What is the direction of the induced current in the loop?
A) There is no current. B) counterclockwise then clockwise C) clockwise then counterclockwise D) clockwise E) counterclockwise