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- A rocket sled accelerates to 41 m/s. When the rocket engine stops, the sled skids along its rails. If the coefficient of friction is 0.5 and its mass is 1000 kg, how fast is the sled moving after 2.2 s?A 2600 kg car traveling to the north is slowed down uniformly from an initial velocity of 30.5 m/s by a 7670 N braking force acting opposite the car’s motion. (a) What is the car’s velocity after 1.87 s?Answer in units of m/s. (b) How far does the car move during the 1.87 s?Answer in units of m.A commercial airplane is coming in for a landing. Just before it hits the runway it is moving at 76 m/s. The plane has a mass of 20,000 kg. The runway is 1.6km long and, obviously, the airplane needs to be stopped before it reaches the end of the runway. How large is the braking force the airplane needs to stop safely before the end of the runway?
- A boat and its passengers have a combined mass of 5.10x10^2 kg. The boat is coasting into a pier at a speed of 1.00 m/s. How great a force is required to bring the boat to rest in 1.00x10^2 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?A 1.4 gram bullet is shot into a tree stump. It enters at a velocity of 341 m/sec and comes to rest after having penetrated the stump in a straight line. It takes 0.00032 sec to come to a stop after striking the stump. What was the force on the bullet during impact? (answer in Newtons)
- A teacup fell was left on the wing of a fighter jet and did not fall until the jet was already very high up and very fast. After falling for some time it has reached a constant velocity of 55 m/s. The mass of the teacup is 237 g. What is the net force acting on the teacup?A clever coyote uses rocket powered skates to try to catch a roadrunner. The mass of the coyote is 38.1 kg. If the coyote starts from rest, and accelerates to a final speed of 26 m/s in a distance of 2.4 m, how much thrust force did the rockets excert to get him to his final speed? Assume this thrust is constant over the 2.4 m.A car has a mass of 1750 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 6500 N. If the car is moving at 22 m/s, what is the shortest distance in which the car can stop safely?
- A bowling ball weighing 54.0 N initially moves at a speed of 5.60 m/s. How long must a force of 36.0 N be applied to the ball to stop it?On a snowy road, a driver applies a braking force of 6017 N on his 1174 kg car. The car travels between two points a distance of 39.6 m along the snowy road in 2.39 s. How fast is the car moving when it passed by the first point?An electron is a subatomic particle (m= 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +7.31 x 105 m/s to a final velocity of 1.98 x 106 m/s while traveling a distance of 0.0545 m. The electron's acceleration is due to two electric forces parallel to the x axis: F₁ = 7.52 x 10-¹7 N, and F2, which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force F2. F₁ F₁ F₂ F₁ (a) Number i (b) Number i VO X Units Units