A 1.6-kg block slides down a plane (inclined at 25° with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
a. +28 W
b. +13 W
c. ?13 W
d. ?28 W
e. +6.5 W
c
You might also like to view...
RLC Circuits: A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor, and a 200-? resistor. What is the rms value of the current in this circuit?
A. 1.5 A B. 0.48 A C. 2.5 A D. 3.5 A E. 0.59 A
250. J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas?
What will be an ideal response?
A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T • m/
A) A) 9.8 × 10-6 N B) 7.8 × 10-7 N C) 9.8 × 10-8 N D) 4.9 × 10-6 N
When a body moves in a straight line with increasing speed, the net force on it must be increasing
Indicate whether the statement is true or false