Kate is driving her car at 80 km h when she sees a kangaroo on the road in front of her. The mass of the car is 1900 kg (assume the mass of Kate is negligible compared with the car). b If the maximum frictional force between the road and tyres is 1.4 x 10' N, what is the minimum stopping distance when Kate applies the brakes? If the car skids, so that kinetic friction rather than static friction is acting on the tyres, will the stopping distance be greater or smaller? Explain your answer.
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- a he he e? JedW 84. N As of 2012, all of the shuttles in NASA's space shuttle pro- M 11010 mono gram have been retired. When they once launched, a space Runo shuttle (mass = 2.03 X 106 kg) would lift off as the thrust of its three main engines was suddenly augmented by the firing of the solid rocket boosters at t = 0 s. Suppose the shuttle's accelera- tion is given by a = 3.00t + 0.330t² - 0.100t³, where a is in meters per second squared and t is in seconds, in the first few seconds after liftoff. What is the change in the kinetic energy of the space shuttle during the first 3.50 s after liftoff in this scenario? MOB You have two identical books, A and B, each of mass m, on the palm of your hand as shown above. You move your hand upwards with the books, increasing the speed as time goes on. Which of the following is true? = A FH and on A = FHand on A FHand on A = FA on B+mg FHand on A > FB on A + mg FHand on A = 2mg FA on B FH and on BSuppose a car approaches a hill and has an initial speed of 120 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. Note: the 790-kg car with an initial speed of 120 km/h is observed to coast up a hill and stops at a height 21 m above its starting point. a.) What is the magnitude of the average force of friction, in newtons, if the hill has a slope 2.7° above the horizontal?
- Ⓒ Macmillan Learning A small block of mass m slides to the left on a frictionless, horizontal surface with speed u. Then, the block slides up a rough ramp that has an incline angle of a. The coefficient of kinetic friction between the ramp and box is μ. The acceleration due to gravity is g. What is the height h of the block when its speed up the ramp equals cu, where 0 < c < 1? h = Incorrect ₂² (1-c²) 2g+mg sin(a) CV Final position m Rough surface Initial position m Frictionless surfaceA car moving at 30 m/s crashes into a tree and stops in 0.3 s. Calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 84 kg. (Enter the magnitude.) Na A B Three blocks, each of mass 13 kg are on a frictionless table. A hand pushes on the left most box (A) such that the three boxes accelerate in the positive horizontal direction as shown at a rate of a = 1.4 m/s?. 1) What is the magnitude of the force on block A from the hand? N Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. +) 2) What is the net horizontal force on block A ? N Submit You currently have O submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. +) 3) What is the horizontal force on block A due to block B? N Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. 4) What is the net horizontal force on block B? N Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more…
- You want to lift a heavy box with a mass L = 91.0 kg using the two-ideal pulley system as shown. With what minimum force do you have to pull down on the rope in order to lift the box at a constant velocity? One pulley is attached to the ceiling and one to the box. Lkg NEspecially part CA B Let's revisit a previous problem and add the force of friction. In the figure, block A has a mass of 2.67 kg. It rests on a smooth but not frictionless horizontal table and is connected by a very light horizontal string over an ideal pulley to block B, which has a mass of 2.82 kg. The coefficient of kinetic friction between block A and the table is 0.210. When block B is gently released from rest, how long does it take block B to travel 0.713 m? Be sure all quantities are expressed in standard units before calculating anything. Report your answer in seconds.
- A6.00 kg box sits at rest at the bottom of a ramp that is 8.00 m long and is inclined at 30.0° above the horizontal. The coefficient of kinetic friction is Hk = 0.40, and the coefficient of static friction is us = 0.43. Part A What constant force F, applied parallel to the surface of the ramp, is required to push the box to the top of the ramp in a time of 6.00 s? Express your answer to four significant figures and include the appropriate units. HẢ ? F = 49.77 Submit Previous Answers Request Answer X Incorrect; Try Again; 9 attempts remainingPlease answer and solve the question correctly. Thank you!After falling from rest from a height of 29 m, a 0.45-kg ball rebounds upward, reaching a height of 19 m. If the contact between ball and ground lasted 2.2 ms, what average force was exerted on the ball? (Enter the magnitude.) N