2. A 5 kg block moves with a constant speed of 10m/s to the right on a smooth surface where frictional forces are
considered to be negligible. It passes through a 2.0 m rough section of the surface where friction is not negligible,
and the coefficient of kinetic friction between the block and the rough section 4, is 0.2. What is the change in the
kinetic energy of the block as it passes through the rough section?
A. 20 J of energy is removed from the block.
C. 250 J of energy is removed from the block.
B. 20 J of energy is added to the block.
D. 250 J of energy is added to the block.
Answers: 2
Physics, 21.06.2019 22:20, CM0
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage
Answers: 2
Physics, 22.06.2019 04:40, hannah1072
How is the gravitational force related to the distance between two objects?
Answers: 1
2. A 5 kg block moves with a constant speed of 10m/s to the right on a smooth surface where friction...
Mathematics, 19.08.2020 20:01
Mathematics, 19.08.2020 20:01
Mathematics, 19.08.2020 20:01