Problem 2: A runaway train has a mass of 1.5 × 104 kg and a speed of 5 m/s. How much time does it take for a force of magnitude 1500 N to bring the train to rest?
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- A student pushes a physics textbook of mass 1.15 kg across a table with a horizontal force of 5.48 Newtons. If the frictional force between the table and the textbook is 3.38 Newtons and the textbook was initially at rest, what is the speed of the textbook after 2.3 seconds? Remember to give your answer in metres per second and to at least 3 significant figures.A 91 kg janitor wearing running shoes is running across an ice rink at a speed of 3.2 m/s. They try to stop abruptly, but keep sliding across the surface of the ice. The ice exerts a frictional force of 13.4 N to slow them down. How far do they travel before halting to a stop?Somone is standing on a piece of cardboard holding a wire that is attached to a vehicle. The friction between the cardboard and road is 67N. The wire makes a 24° angle with the road. The tension on the wire is 134N. If they start from rest how long does it take them to reach a speed of 14m/s and how far have they traveled? The mass of the person and the cardboard is 80kg
- An object has a velocity (3.5 m/s)i + (-4.76 m/s)j + (4.68 m/s)k. In a time of 3.21 s its velocity becomes (-3.79 m/s)i + (0.00 m/s)j + (4.68 m/s)k. If the mass of the object is 6.4 kg, what is the magnitude of the net force on the object, in N, during the 3.21 s? Assume the acceleration is constant.An object with a mass of 1.53 kg is initially at rest upon a horizontal, frictionless surface. An applied force of 4.94 N i acts on the object for 2.2 s. What is the object's final speed?An constant applied force of 40.1 N lifts an 2.50 kg mass straight up, resulting in a final speed of 3.6 m/s. What distance did the mass move if it was initially at rest?
- An object with a mass of 1.95 kg is initially at rest upon a horizontal, frictionless surface. An applied force of 3.81 Ni acts on the object for 2.33 s. What is the object's final speed? Enter a number rounded to 2 decimal places and assume the answer has proper SI Units.A rock of mass m falls from the top of a cliff and it experiences a significant amount of air drag as it falls. The rock has a mass of 3.6 kg and the cliff is 55 m tall. If it is going 22 m/s when it hits the ground, what was the average force of air resistance? Express your answer to two significant figures and include the appropriate units.Problem 1: A nurse pushes a patient’s bed with a constant force of 30 N. If the bed has a mass of 100 kg and was initially at rest, how fast is the bed moving after 5 seconds? Problem 2: A young man was rushed to the operating room to treat several gunshot wounds. If a rib fracture requires a force of 3,200 N, does a bullet with a mass of 7.5 grams that strikes the rib with an deacceleration of 4.4x105 m/s2 have enough force to create the fracture? What is the force?
- An object with a mass of 1.74 kg is initially at rest upon a horizontal, frictionless surface. An applied force of 4.11 N i acts on the object for 2.64 s. What is the object's final speed? Enter a number rounded to 2 decimal places and assume the answer has proper SI Units.A 100 kg skier starts from rest at the top of a ski slope that is 50 m long. If his final speed at the bottom of the slope is 10 m/s, where the bottom of the slope is 20 m below the top, what is the approximate average force of friction between the skis and the slope? 20 m 50 m O 300 N O 1500 N ○ 600 N ○ 750 N O 150 N. Papa Smurf (whose mass is 1kg) is sliding at 1.0 m/s over an icy pond that has no friction. A force of 6 N acts on the smurf in the direction of its motion for 5 s. What is his final velocity?