A Porsche accelerates uniformily from 0 to 60 miles per hour in 5 seconds. Assuming a frictionless air track and a glider mass of 550 grams, find the mass M2 that one must hang from the glider in order to obtain an acceleration equal to that of the Porsche.
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A Porsche accelerates uniformily from 0 to 60 miles per hour in 5 seconds. Assuming a frictionless air track and a glider mass of 550 grams, find the mass M2 that one must hang from the glider in order to obtain an acceleration equal to that of the Porsche.
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- A 1370-kg car is skidding to a stop along a horizontal surface. The car decelerates from 27.6 m/s to a rest position in 3.15 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface.A man pushes an object to the right and exerts a force which has a horizontal compotent of F = 33 N. A horizontal frictional force has a magnitude of f = 15 N which opposed the horizontal component of the fushing force. The mass of the object is m = 31 kg. Write an expression for the magnitude of the acceleration of the object. If the object starts at rest what is the speed in meters per second at t = 2.00s? If the man stops pushing the object at t = 2.00s and the firctional force is constant what is the distance in meters does to object slide before coming to a rest?A boy slides down a hill on a sled (total mass of 31 kg) and coasts onto a flat plain with a speed of 6.5 m/s. Friction between the sled and the snow exerts an average force of magnitude 38 N on the sled. How far (in m) does the sled travel before stopping? (Note: First, find the acceleration of the boy using Unit Two material, then use this to compute the distance using Unit One material.)
- The brakes on a big truck fail and it is forced to use a runaway truck lane. The lane is perfectly horizontal, and full of deep gravel, creating a coefficient of kinetic friction between the truck and the gravel of 0.80. The truck enters the lane at moving 35 m/s (about 80 mph). How far does the truck travel before it stops?A skater with an initial speed of 6.80 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.0700. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest?A skater with an initial speed of 5.90m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.125. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest?
- A bartender slides a mug of root beer with mass m - 2.4 kg down a bar top of length L 1.8 m to an inattentive patron who lets it fall a height h 1.4 m to the floor. The bar top (see figure below) is smooth but still has a coefficient of kinetic friction of HK 0.078. (Assume up and to the right as the positive directions.) (a) If the bartender gave the mug an initial velocity of 2.5 m/s, at what distance D from the bottom of the bar will the mug hit the floor? 0.9996 m (b) What is the mug's velocity (magnitude and direction) as it impacts the floor? Magnitude 75 Direction (counterclockwise from the +x-axis) 68.9 X m/s x ° (c) Draw velocity time diagrams for both the x and y directions for the mug, from the time when the bartender lets: go of the mug to when it hits the floor. Need Help? Read I Submit AnswerA particle of mass 4 kg is undergoing one-dimensional motion. It is subject to a constant force of 45 N, and has an initial speed of 8 m/s. The force is parallel to the initial velocity, both of which are directed in the positive direction along the axis of motion. What is the displacement X in meters , of the particle between t=0, and t=5?Two horses pull a cart with a total applied force of 1000N. The kinetic friction from the gravel road has a value of 375 N. Assuming the cart is 200kg, what is the acceleration of it?The road is flat and the horses are traveling in a straight path.
- A car with a mass of 1.3x10° kg is skidding to a stop along a horizontal surface. The car decelerates from 33 m/s to rest in 3.9 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface.Sunjamming. A “sun yacht” is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, it can be large enough to send the spacecraft outward from the Sun on a cost-free but slow trip. Suppose that the spacecraft has a mass of 900 kg and receives a push of 20 N. (a) What is the magnitude of the resulting acceleration? If the craft starts from rest, (b) how far will it travel in 1 day and (c) how fast will it then be moving?Particle physicists have identified a type of fundamental particle called a muon, which effectively behaves like a very heavy electron. Imagine a muon of mass 1.88 × 10-28 kg is observed in a particle accelerator. It has an initial speed of 3.50 × 105 m/s. It moves in a straight line, and its speed increases to 1.25 × 106 m/s in a distance of 75.0 cm. Assume that the acceleration is constant. Find the magnitude of the force exerted on the muon.