2. A person with a mass of 65 kg travels through a snow using snow board. He is skiing for 20s and a constant friction force of 25 N acts on him. What is his change in velocity?
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A: We know that the area under the acceleration time graph is change in velocity.
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A: Ans:- Image-1
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Q: 20kg
A:
Q: 2. A block with mass m; = 4.00 kg and a ball with mass m2 =6.00 first second of motion if both…
A: Using FBD and equation from Laws of motion we solve as follows
2. A person with a mass of 65 kg travels through a snow using snow board. He is skiing for 20s and a constant friction force of 25 N acts on him. What is his change in velocity?
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- e 61. At the local grocery store, you push a 14.5-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N, you now accelerate the cart from rest through a distance of 2.29 m in 3.00 s. What was the mass of the dog food?A car of mass 2,000 kg coasts down the highway with a constant velocity of v = 15.0 m/s. The car then goes over a hill 3.00 m vertically high. Which of these best describes the velocity of the car at the top of the hill? a. it's 15.0 m/s b. it's zero m/s c. it's less than 15.0 m/s d. it's greater than 15.0 m/s e. none of these77. A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +11 m/s in a time of 28 s. The combined mass of the boat and trailer is 410 kg. The frictional force acting on the trailer can be ignored. What is the tension in the hitch that connects the trailer to the car?
- A 48.42kg hunter ropes a 167.82 kg sleeping polar bear and pulls the bear towards him until they meet. Originally they are 211.22 m apart on frictionless ice. When the hunter pulls the polar bear to him the hunter will move... a. 52 b. 810 c. 67 d. 1606. Initially at rest, a block with a mass of 6 kg above a frictionless surface is pulled to the right along the horizontal with a force of 12 N. What is the velocity of the block after it has moved 3 m?8. Carol, who weighs 60 kg, is driving her car at a speed of 25 m/s. She sees a dog crossing the road and so she steps on the brake to avoid hitting it. Her seatbelt brings her body to a stop in 0.40 s. a. What average force does the seatbelt exert on her? b. If she is not strapped to her seatbelt, and the windshield stops her head in 0.001 s, what average force would the windshield exert on her?
- 12. Two identical vehicles traveling at the same speed are made to collide with barriers in an insurance company collision test. The first vehicle collides with a concrete barrier, and stops in a time of approximately 0.1 s. The second vehicle collides with a collapsible barrier, and comes to rest in about 1 second. Which object is subject to a larger force? a. Since both cars were brought to rest, they both experience the same force. b. The car that hit the concrete barrier. c. The car that hit the collapsible barrier. d. Neither car experiences a force. They are simply undergoing a change in momentum.You are in charge of improving the safety of a carnival ride. The ride involves a 165 kg cart travelling at 13.1 the wall. m S toward a brick wall. The cart is supposed to stop at the last second just before it hits You want the cart to come to a complete stop within a time of 1.85 s. What force is required to stop the cart in this amount of time? F = N Based on the parts you have been provided, you are able to exert a force of 3820 N on the cart. What is the maximum initial speed that the cart could have and still stop within 1.85? Vmaximum = m S57. A girl pushes a 10 kg box from rest across a horizontal floor with a force of 50 N. The force of friction opposing her is 45 N. If the box uniformly accelerates from rest to a final velocity of 2.0 m/s/s, how much time did it take to get that to that velocity?
- A student pushes a 12-kg block on a frictionless, horizontal surface. If the block is initially at rest, what is the speed of the block after the student pushes the block for 5 seconds with an acceleration of 2.0 m/s/s? O 2.0 m/s 6.0 m/s 10 m/s 60 m/s1. A 200-N block in contact with a level plane is acted upon by a horizontal force P = 100N. The fk = 0.20. What time will the velocity of the block be increased from 4m/s to 10m/s? 2. At time t = 0 s, an object is observed at x = 0 m; and its position along the x axis follows this expression: x = –4t + t2, where the units for distance and time are meters and seconds, respectively. What is the object's displacement ?x between t = 1.0 s and t = 3.0 s?For how long a time must a tow truck pull with a force of 550 N on a stalled 1200 kg car to give it a forward velocity of 2.0 m/s?