Unit 6 UT Homework-problems

vijayaraghavan (vv8837) – Unit 6 UT Homework – crane – (23242) 2 An 75 kg man drops from rest on a diving board - 2 . 7 m above the surface of the water and comes to rest 0 . 6 s after reaching the water. The acceleration due to gravity is 9 . 81 m / s 2 . What force does the water exert on the man? Answer in units of N. 009 1.0points A hockey player makes a slap shot, exerting a force of 44 . 6 N on the hockey puck for 0 . 284 s. What impulse is given to the puck? Answer in units of kg m / s. 010 1.0points A force of 2420 N is needed to bring a car moving at 26 . 1 m / s to a halt in 24 . 1 s. What is the mass of the car? Answer in units of kg. 011 1.0points A 1 . 85 kg steel ball strikes a massive wall at 5 . 22 m / s at an angle of 62 . 3 ◦ with the perpendicular to the plane of the wall. It bounces off the wall with the same speed and angle it originally had. x y 5 . 22 m / s 5 . 22 m / s 62 . 3 ◦ 62 . 3 ◦ If the ball is in contact with the wall for 0 . 2 s , what is the magnitude of average force exerted on the ball by the wall? Answer in units of N. 012 1.0points A 0 . 036 kg bullet is fired vertically at 270 m / s into a 0 . 19 kg baseball that is initially at rest. How high does the combination rise after the collision, assuming the bullet embeds itself in the ball? The acceleration due to gravity is 9 . 8 m / s 2 . Answer in units of m. 013 1.0points A 0.311 kg bead slides on a straight friction- less wire with a velocity of 3.46 cm/s to the right, as shown. The bead collides with a larger 0.624 kg bead initially at rest. After the collision, the smaller bead moves to the left with a velocity of 0.64 cm/s. 0 . 311 kg 3 . 46 cm / s 0 . 624 kg Find the distance the larger bead moves along the wire in the first 4.6 s following the collision. Answer in units of cm. 014 1.0points A 1400 kg car traveling at 17.4 m/s to the south collides with a 6000 kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after the collision. What is the final velocity of the two-vehicle mass? Assume that North is positive. Answer in units of m / s. 015 1.0points Two carts with masses of 4.7 kg and 3.1 kg move toward each other on a frictionless track with speeds of 5.4 m/s and 4.2 m/s, respec- tively. The carts stick together after colliding head-on. Find their final speed. Answer in units of m / s. 016 1.0points A 1.29 kg skateboard is coasting along the pavement at a speed of 5.34 m/s when a 0.710 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat