7) A 4 kg block initially at rest is pulled by an 80 N force at 30° on a surface with a coefficient of friction of 0.10. Find the speed of the block after it has moved 2 m.
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- A man does 4,550 J of work in the process of pushing his 3.00 x 103 kg truck from rest to a speed of v, over a distance of 25.5 m. Neglecting friction between truck and road, determine the following. (a) the speed v (in m/s) m/s (b) the horizontal force exerted on the truck (in N)A mechanic pushes a 3.30 x 103-kg car from rest to a speed of v, doing 5,460 J of work in the process. During this time, the car moves 27.0 m. Neglecting friction between car and road, find v and the horizontal force exerted on the car. (a) the speed v m/s (b) the horizontal force exerted on the car (Enter the magnitude.)A snowboarder starts from rest at the top of a mountain. He boards a vertical distance of 50 m down the mountain, and then he goes off a jump at 20 m/s. What must be the vertical height of the jump? Assume no friction is present.
- Thank you!QI) ( A block of mass m-10 kg is on a frictionless horizontal surface and pushed against the spring, whose spring constant k-240 N/m, compressing the spring by 3m. The block is then released from rest. The block is observed to move up the incline and come back down, hitting and 771 compressing the spring by a maximum distance of Im. The inclined plane has www. friction and makes an angle of 9 = 37° with the horizontal. a) Find the work done by friction from the moment the block is released till the moment it strikes the spring again. b) What is the maximum height the block can reach? c) Find the kinetic friction coefficient between the block and the inclined plane.As shown in the figure below, a 2.25 kg block is released from rest on a ramp of height h. rough patch. mummy 15.0 cm When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.0 cm that has a coefficient of kinetic friction k = 0.710. Find h (in m) such that the block's speed after crossing the rough patch is 3.20 m/s. (Enter a number.) m t