A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gunpowder. What is the average force exerted on a 0.0300 kg bullet to accelerate it to speed of 600 m/s in a time of 0.002 s
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A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gunpowder. What is the average force exerted on a 0.0300 kg bullet to accelerate it to speed of 600 m/s in a time of 0.002 s
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- A sled filled with sand slides without friction down a 45 ∘ slope. Sand leaks out a hole in the sled at a rate of 3.2 kg/s. If the sled starts from rest with an initial total mass of 45.0 kg , how long does it take the sled to travel 100 m along the slope?About 70 g of blood is pumped from a person's heart into the aorta during each heartbeat. The blood starts at rest with respect to the body and has a speed of about 1.2 m/s in the aorta. If the pumping takes 0.15 s, what is the magnitude of the average force exerted by the heart on the blood?A 0.24 kg blob of clay is thrown at a wall with an initial velocity of 23 m/s. If the comes to a stop in 91 ms, what is the average force experiences by the clay?
- When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 84.8-kg man just before contact with the ground has a speed of 7.88 m/s. (a) In a stiff- legged landing he comes to a halt in 2.35 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his knees, he comes to a halt in 0.217 s. Find the magnitude of the average net force now. (c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the magnitude of the force applied by the ground on the man in part (b). (a) Number i (b) Number i (c) Number i Units Units Units > >You wake up one morning to find yourself in a strange room with opaque walls, and no visible doors or windows. You decide to do some experiments to find out more about your strange situation. Your own body mass is 72.4 kg. You pick up an object and drop it from rest, starting at a height of 1.72 meters above the floor, and it hits the floor 0.415 seconds later. You can ignore air resistance. Based on the outcome of this experiment, when you step on the scale provided for you, what weight will it register for your body? 710.2 N 723 N 964 N 1,446 NA 4.0 g bullet leaves the muzzle of a riffle with a speed of 328 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.77 m long barrel of the riffle?
- Dizzy is speeding along at 31.1 m/s as she approaches the level section of track near the loading dock of the Whizzer roller coaster ride. A braking system abruptly brings the 325-kg car (rider mass included) to a speed of 3.5 m/s over a distance of 5.12 meters. Determine the magnitude of the braking force (in newtons) applied to Dizzy's car.Dizzy is speeding along at 22.8 m/s as she approaches the level section of track near the loading dock of the Whizzer roller coaster ride. A braking system abruptly bring the 328-kg car (rider mass included) to a speed of 2.9 m/s over a distance of 5.55 meters. Determine the braking force applied to Dizzy’s car.An arrow is accelerated out of a bow. What is the average force exerted on a 0.15 kg arrow if it is accelerated to a speed of 110 m/s in a time of 5 ms?
- When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 69.5-kg man just before contact with the ground has a speed of 8.82 m/s. (a) In a stiff-legged landing he comes to a halt in 4.17 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his knees, he comes to a halt in 0.267 s. Find the magnitude of the average net force now. (c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the magnitude of the force applied by the ground on the man in part (b).A crane drops a 1.7 kg steel ball onto a steel plate. The ball's speeds just before impact and after are -8.5 m/s and 5.3 m/s, respectively. If the ball is in contact with the plate for 0.048 seconds, what average force does the ball exert on the plate during impact?A car of mass 1,907 kg collides with a wall. The initial speed of the car is 18.2 m/s. After collision, the car bounced in the opposite direction at a speed of 2.9 m/s. If the collision lasted for 172 ms, what was the average force in newtons exerted on the car by the wall? Express your answer in two decimal places with units of Newton.