A skier (m=53.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 3.20 m and D = 10.8 m, find H.

(a) Salim who participates in motor race, leaves the end of a ramp with a speed of 90km/hr as in Figure. If his speed is 85.0 km/r when he reaches the 90 km/h peak of the path, what is the maximum height that he | reaches? Ignore friction and air resistance. (b) A body of mass 6 kg is acted upon by a force of 5 N is moving along a rough floor at a constant speed of 3.5 m/s. Calculate the power consumed in 15 s, and the force of friction acting on the object (a) To find the depth of a water well at home, Martha and Amira drop a heavy rock into the well. After 3s, the rock is 4. dropped, they hear a splash caused by the impact of the rock on the water. What is the height of the well? (Speed of sound in air is 340 m/s). (b) Professor Walter Lewin, for his famous Physics experimental demonstration, hanged a bowling ball from the ceiling by a rope. He then pulls the ball away from its equilibrium position and holds it adjacent to his nose, as shown. He releases the ball so that it swings…

10) Starting from rest, a 97.0 kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 800 N, and his speed at the bottom of the pole is 3.60 m/s. How far did he slide down the pole?

A body weighing 40 lb starts from rest and slides down a plane at an angle of 30° with the horizontal for which the coefficient of friction µ = 0.30. (1) How far will it move during the third second? (2) How long will it require for it to move 60ft?

1) In Figure, a block with mass m = 1 kg is released from height h, friction until it reaches the path with first length d,= 3 m, where the friction force between B and C is f, = 9 N, and until it reaches the path, where the friction force between E and F is f, = 7 N. The height is h, = 1 m, and second horizontal length is d,= 1 m. The block continues its motion after the point F. (a) Find the velocity at the point A. (b) Find the velocity at the point D. (c) Find the height h if the velocity of m is v= 9 m/s at the point F.(sin45=0.7 g=9.8 m/s²) 11 m. Its path is without 1 m (F d,=1 m h h, = 11 m D 45° E d,=3 m h,=1 m A В

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.

A parachutist whose mass is 75 kg drops from a helicopter hovering 1000 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b, 30 N-secim when the chute is closed and by 100 N-secim when the chule is open if the chute does not open until the velocity of the parachutist reaches 20 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/sec The parachutist will reach the ground after (Round to two decimal places as needed.) seconds. CHE

A block of mass m = 9kg with initial speed of v₂ = 12.3m/s travels a distance d = 10.8m on an inclined plane with = 39° and comes to rest. Determine the coefficient of kinetic friction, μ = ? using two decimal places. Take g = 9.80m/s². Answer: Vi 0

A skier starts stationary at the top of a 20 m long slope and begins to descend. The skier's acceleration is 0.2 m/s?. At the bottom of the slope the skier glides under a frictional deceleration of 0.1 m/s?. (1) Calculate the speed of the skier at the bottom of the slope. (ii) Calculate how far the skier glides before coming to rest. An athlete of mass 70 kg begins to run, and is observed to have velocity over the first 5 strides of 3.0, 4.2, 5.0, 5.6, and 6.0 m/s. For each stride calculate the net impulse delivered due to the horizontal ground reaction force.