A 1.9×104 kg rocket has a rocket motor that generates 2.7×105 N of thrust. The initial upward acceleration is 4.4 m/s^2. At an altitude of 5000 m the rocket's acceleration has increased to 5.3 m/s^2. What mass of fuel has it burned?

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 4.4-g bullet leaves the muzzle of a rifle with a speed of 336 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.78-m-long barrel of the rifle?

A 4.2-g bullet leaves the muzzle of a rifle with a speed of 322 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.85-m-long barrel of the rifle?

In the "before" part of the figure, car A (mass 1200 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1300 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low μk of 0.20) stops them, at distances då = 7.9 m and dB = 6.2 m. What are the speeds of (a) car A and (b) car B at the start of the sliding, just after the collision? (c) Assuming that linear momentum is conserved during the collision, find the speed of car B just before the collision. Before After (a) Number Units (b) Number Units (c) Number Units B B

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 N

A 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?

A 4.0-g bullet leaves the muzzle of a rifle with a speed of 328 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.76-m-long barrel of the rifle?

The force of that particle 2 exerts on 1 is given by: F→21(t)=Fxe^−(t/T)ı^+Fysin⁡(2πt/T)ȷ^ Where the parameters have the values: Fx=−16.1 N, Fy=101 N, T=67 s.We will consider a time interval that begins at ti=0 s and ends at tf=321 s. the mass of particle 1 is 13.9 kg and its intial velocities are 54 m/s I^ + (-42 m/s)J^. What is the x and y displacement for particle 1?

A 31.0-kg skateboarder rides on a 10.0-kg skateboard at 5.7 m/s on a level road before jumping into air with a speed of 10.0 m/s against the ground in the direction of 27.0◦ above the forward, horizontal direction to leave the skateboard. Ignore air resistance and the friction between the road and skateboard.   What is the maximum height that the skateboarder can reach? (A) 1.05 m; (B) 1.25 m; (C) 1.45 m; (D) 1.65 m; (E) 1.85 m.   What is the speed of the skateboard on the ground after the jump? (A) 3.85 m/s; (B) 4.05 m/s; (C) 4.25 m/s; (D) 4.45 m/s; (E) 4.65 m/s.   What is the minimum work done by the skateboarder to make the jump? (A) 994J; (B) 974J; (C) 954J; (D) 934J; (E) 914J.