Starting from rest, a 93-kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 840 N, and his speed at the bottom of the pole is 3.6 m/s. How far did he slide down the pole? ho
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- Calculate the final speed vs of a 2.00-kg object that is pushed 2.00 kg for 34.0 m by a 30.0-N force directed 30.0° below the 30° horizontal on a level, frictionless floor, as shown in the figure. Assume the object starts from rest. d Uf = m/sAt the start of a race, a four-man bobsled team pushes their sled as fast as they can along a 50 m flat starting stretch. The net force that the four men together apply to the 325 kg bobsled is 964.079 N directed at 15 degrees below the horizontal. As they push, 60 N of kinetic friction opposes them. What is the speed of the sled right before the team jumps on the sled?Suppose the roller-coaster car in the figure passes 32 m/ Part A 2 point 1 with a speed of 1.30 m/s. V2 3 4 μA If the average force of friction is equal to 0.15 of its weight, with what speed will it reach point 2? The distance traveled is 41 m. Value Units Express your answer to two significant figures and include the appropriate units. 26 m 14 m B ?
- Sam, whose mass is 74.0 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 220.0 N and a coefficient of kinetic friction wtih the snow of 0.07. Unfortunately, the skis run out of fuel after only 11.5 seconds. What Sam's top speed (in m/s) assuming that the acceleration due to gravity is 9.80 m/s2? How far (in m) has Sam traveled when he finally coasts to a stop?A block slides down a frictionless inclined ramp. If the ramp angle is 19.0° and the length of it is 4.45 m find the speed of the block as it reaches the end of the ramp, assuming it started sliding from rest at the top. (ramp angle is the angle that the ramp made with the horizontal line, the length is measured along the ramp), g=9.8m/s2, the block has a mass of 9.3 kg.In the figure, a 3.6 kg block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is vo = 6.8 m/s, the height difference is h = 0.99 m, and uk = 0.592. Find d. d H = 0- Number Units the tolerance is +/-5%
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- A girl on a skateboard (total mass of 40 kg) is moving at a speed of 10 m/s at the bottom of a long ramp. The ramp is inclined at 20° with respect to the horizontal. If she travels 14.2 m upward along the ramp before stopping, what is the net frictional force on her?HelpIf a 2 kg object is initially at rest on a frictionless, horizontal surface and subjected to a 13.7 N force in the positive x-direction over a distance of 3.25 meters, what will the object’s final speed be? Assume the answer in in m/s.