A position dependent force, F = 7-2x+3x2-N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is ___________ a) 135 b) 270 c) 35 d) 70
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A position dependent force, F = 7-2x+3x2-N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is ___________
a) 135
b) 270
c) 35
d) 70
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- 3. A student drags a 3 kg box 5 m across a rough floor with a force of 40 N. A frictional force of 10 N resists the motion of the box. A) Calculate the work done by the student. B) Calculate the work done by friction. C) Determine the net work done on the box. D) If the box started from rest, how fast is it going at it approaches 5 m? has a yelocity of 82m Using this force, calculate how much work Slim Jim does to lift the object. Force of weight =mg w= f (d) O 58.8 J 6 J 29.4J 1.5J1) Figure 2 illustrates a block having mass M positioned on a ramp having ramp angle 0 above the horizon. The contacting surfaces have a coefficient of kinetic friction, lk. The block is released from rest and it slides down the ramp such that the magnitude of its vertical displacement is H. The speed of the block when it reaches the bottom of the ramp is Vf. Determine expressions {Uk, 0, g, H, M} for the following: a) the work done on the block by friction; b) the work done on the block by the normal force; c) the work done on the block by gravity; and d) the final speed V¢ of the block M Figure 2 H
- 19- As a 1,240 kg truck travels up a 15.0 m high hill, the nonconservative forces of friction and the force generated by the engine do work on the truck. If the work done by friction is −3.03 105 J and the work done by the engine is +6.36 105 J, determine the change in the truck's kinetic energy (in kJ) as it travels from the bottom of the hill to the top of the hill3. A crate of mass 10.0 kg is puiled up a rougn incine with an initial speed of 1.5 m/s the pulling force is 100 N parallel to the incline, which makes an angle of 20 with the horizontal. The coefficient of kinetic friction Is 04, and the crate is puiled 5.0 m (a) How much work is done by the gravitational force on the crate? (b) Determine the increase in internal energy of the crate-incline system owing to friction. (c) How much work is done by the 100-N force on the crate? (e) What is the speed of the crate after being pulled 5.0 m?