. A mechanic pushes a 2.50x10²-kg car from rest to a speed of v, doing 3 500 J of work in the process. During this time, the car moves 20.0 m. Neglecting friction between car and road, find (a) vand (b) the horizontal force exerted on the car.
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- A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass 145 g) dropped from a height of 60.0 m above his glove. His glove stops the ball in 0.0100 s. What is the force exerted by his glove on the ball?A worker pushes a 35.0-kg package on a horizontal roller-belt conveyor until it reaches a certain speed. The package then coasts on the horizontal conveyor, all the while slowing down, until it comes to a complete stop after moving 1.20 m. While the package is coasting on the conveyor, the opposing friction force averages 6.00 N. Use the WET to find the speed of the package after the worker pushes it and just as it begins to coast. 0.625 m/s 0.759 m/s 0.600 m/s 0.510 m/s 0.802 m/s 0.641 m/sA driver who does not wear a seatbelt continues to move forward with a speed of 18.0 m>s (due to inertia) until somethingsolid like the steering wheel is encountered. The driver now comesto rest in a much shorter distance—perhaps only a few centimeters. Find the magnitude of the net force acting on a 65.0-kg driverwho is decelerated from 18.0 m>s to rest in 5.00 cm.A. 3240 N B. 1.17 * 104NC. 2.11 * 105N D. 4.21 * 105N
- 2. After one month of taking a literature class, a first-year Bard student decides to dispose of all the poetry he wrote in high school. Placing his poetry in a large box that ends total mass of 40 kg, he pushes the box up a frictionless 25° slope that leads to a large cliff dropping into a bottomless chasm. Starting from rest and continually exerting a 500N force in the horizontal direction on the box, how long does it take him to push the box 50 meters up with a 125° up the slope to the cliff?skydiving tunnels have become popular attractions, appealing in part to those who would like a taste of skydiving experience but too overwhelmed by the fear of jumping out of plane at serveral thousand feet. skydiving tunnels are vertical wind tunnel through which air is blown at high speeds allowing visitors to experience body flight. jill decides to try a skydiving tunnel. inside the tunnel she changes her orientation anf for an instant her 68.9kg body momentarily experiences a upward force of air resistance of 455N. determine her acceleration during this moment in time. is it positve or negative?A 10-kg box initially at rest is pulled to the right along a frictionless horizontal surface by a horizontal force of 60N, determine the speed of the box after it has moved 2.0 m. r=4.89 m/s
- If a 2.4 kg object is initially at rest on a frictionless, horizontal surface and subjected to a 11.3 N force in the positive x-direction over a distance of 5.01 meters, what will the object’s final speed be? Assume the answer in in m/s.A 20-Mg train is traveling at a speed of 50 m/s at an angle of 10o. But the driver noticed that the bridge 300-m ahead is missing. At once, he pulls the break, thus applying a frictional resistance of Ff = 1000 N. At the same time Super Botting pushes back the train with a force of Fs=(123)d +100, where d is the distance that the train travels before stopping. Determine the stopping distance d, and mention whether or not Superperson would be able to save the train.A 4kg model rocket, initially at rest, accelerates upwards by generating a 74N thrust as it burns fuel for 5.8s. After running out of fuel the rocket continues upwards until reaching maximum height. Throughout the flight the rocket experiences a steady 8N drag force. Neglect the loss of mass as the rocket ejects fuel.
- 4G !!!: 19:.7 Q32.pdf An automobile weighing 4500 lb is driven down a 5° incline at a speed of 60 mi/h when the brakes are applied, causing a constant total braking force (applied by the road on the tires) of 1800 lb. Determine the distance trav- eled by the automobile as it comes to a stop.Chapter 07, Problem 051 | Your answer is partially correct. Try again. A force F = (7.I0N)? + (4.00 N)ĵ + (5.00 N) k acts on a 1.70 kg mobile object that moves from an initial position of di : (3.70 m) î + (8.10 m)ĵ + (2.00 m) ê to a final = position of áf = (2.80 m)î + (8.50 m)} + (4.40 m) k in 1.70 s. Find (a) the work done on the object by the force in the 1.70 s interval, (b) the average power due to the force during that interval, and (c) the angle between vectors d; and df. a dj. (a) Number Units 38.8 (b) NumberT22.8 Units (c) NumberT12.43 UnitsTo (degrees) Click if you would like to Show Work for this question: Open Show Work Question Attempts: 1 of 10 used SUBMIT ANSWER SAVE FOR LATERThe coefficient of friction between the tires of Shirley's 1985 Ford Coupe and the dry pavement is 0.74. She doesn't drive the car often because it's becoming an antique, but she took it out for a gentle drive yesterday. While driving, she has to suddenly and forcefully brake when the light turned red. She probably shouldn't have been texting and driving! Her car (mass = 1.22x10° kg) skids to %3D a stop with an acceleration of m/s2. Use the approximation g = 10 m/s2.