What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.79. (Write the value and SI unit. )
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- (a) What is the final velocity of a car originally traveling at 50.0 km/h that decelerates at a rate of 0.400m/s2for 50.0 s? Assume a coefficient of friction of 1.0. (b) What is unreasonable about the result? (c) Which premise is unreasonable, or which premises are inconsistent?A block with a mass (m) of 74.7 kg slides along a horzontal surface. the coefficent of kinetic friction is .31. THe block has an ititial speed (v0) at 11.6m/s in the positive direction. 1) write and expression for the x component of the frictional force of the block experiences Ff in terms of the given variables and variables avaible. 2) what is the magnitude of the frictional force? 3) how for will the block travel before coming to rest.on is 11. A string can hold up 12 kg without breaking. You tie the string to a 30 kg object sitting on ice and use it to pull the object horizontally for 22 m. Calculate the minimum possible time to complete the task. T
- An adventurous model got bored and decided to try something new. She went out to the top of a steep icy road and went down on a sled. If friction is so small that it can be neglected, which of the following statements correctly describes the physics in the situation? Ad B C Only gravity acts on the model-sled between points A and B. The model-sled experiences no acceleration between A and C. The sled will stop somewhere near B. There is no force acting on the model-sled between points B and C. The sled will continue moving with constant speed from B onwards.A cyclist is travelling at 21 km/h when she sees a stop sign ahead. She applies the brakes and comes to a stop in 15 m. The mass of the cyclist and the bike is 73 kg. a. Calculate the acceleration of the cyclist. b. Determine the coefficient of friction between the road and the bike tires.1)A shingle slides down a roof having a 30 angle and falls off with a speed of 2.0 m/s.a. How long will it take to hit the ground?b. Calculate the highest point reached by it. 2)A 20.0 kg trunk is pushed across the floor of a moving van by a horizontal force. If thecoefficient of kinetic friction between the trunk and the floor is 0.255, what is the magnitudeof the frictional force opposing the applied force?
- A 200-g hockey puck is launched at an initial speed of 16 m/s up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are us = 0.40 and uk = 0.30, respectively. a. Sketch the situation and make a motion diagram (including acceleration vector) for the puck. b. Make a foree diagram for the puck at at instant during it's way up the ramp. c. Write an equation representing the sum of forces along the slope and an equation representing the sum of forces perpendicular to the slope, d. Find the friction force between the puck and the ramp. Show all work. e. Find the acceleration of the puck as it travels up the ramp. Show all work. f. Would the puck have greater, sınaller or sane acceleration if it had twice the mass (everything else about the situation being the same)?A round with a mass of m=19.5g is fired out of a rifle that has a length L=1.18m. The round spends t=0.16s in the barrel.a. Calculate the magnitude of the round's accelration, in m/s2 as it travels thorugh the rilfe's barrel. You may assume that the acceleration is constant throughout the motion.b. What is the numerical value of the net force in newtons acting on the round?A 30 kg cannonball is shot at a sailing ship. When it hits the wooden sides of the ship, it just barely punches through the wooden hull, applying a 200 000 N force to the ship the whole time it was stopping. → If the cannonball was originally travelling at 300m/s, how long would it take to completely stop in the hull of the ship assuming constant acceleration.
- A 60.0 kg skier is moving down a snowy hill inclined at 5 degrees above the horizontal withan acceleration of 0.4m/s2a. What is the acceleration of the same skier when she is moving down a hill with aslope of 10 degrees? Assume that the coefficient of friction is the same for bothcases.b. How much time will it take her to move 25.0m along 10 degree slope?c. After 25.0m, the slope levels out and becomes flat and smooth. She skis into asnowbank which slows her to a stop in a distance of 0.80m. How much forcedoes the snowbank exert on her?d. How much force does she exert on the snowbank?I watched a lot of Looney Toons when I was a kid, and liked that the Roadrunners legs would spin for a second or two before their claws caught traction. a. With a coefficient of kinetic friction 0.2 what acceleration will the roadrunner experience while their feet are sliding accross the ground? b. How far forward will the roadrunner drift in a half second, starting from rest under this acceleration? c. After catching traction the Roadrunner accelerates away, travelling 10 m to get offscreen in one fifth of a second. What was their coefficient of static friction?A car skids to a stop on an icy road. The car has an initial velocity of 25.0 m/s and skids for 10.4 s before stopping. The mass of the car is unknown. a. Calculate the acceleration of the car. b. Draw the free-body diagram with the forces, but without their magnitudes. c. Find the coefficient of kinetic friction, ?k , between tires and the road. (Tricky. You don’t know the car’s mass, but you don’t have to know it. The mass cancels from the equation.)