hw 3 questions & answers graded A+ 2023 passed

hw 3A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater acceleration. speed. momentum. all of the above none of the above momentum. What is the speed of a 4-kg ball with a momentum of 12 kg∙m/s? 3 m/s 4 m/s 12 m/s 48 m/s none of the above 3 m/s What is the mass of a ball moving at 4 m/s with a momentum of 48 kg∙m/s? 192 kg 12 kg 48 kg 4 kg none of the above 12 kg The distinction between impulse and force involves the mass and its effect on resisting a change in momentum. time the force acts. distance the force acts. difference between acceleration and velocity. time the force acts. The force of a falling apple hitting the ground depends upon the time of contact with the ground. the speed of the apple just before it hits the ground. whether or not the apple bounces. all of the above all of the above To catch a fast-moving softball with your bare hand, you extend your hand forward just before the catch and then let the ball ride backward with your hand. Doing this reduces the catching force because the time of catch is increased. relative velocity is more. time of the catch is decreased. relative velocity is less. none of the above time of catch is increased. F = mv/t A heavy truck and a small car roll down a hill at the same speed and need to stop in the same amount of time. Compared with the force to stop the car, the force needed to stop the truck is greater. smaller. the same. greater. The conservation of momentum is most closely related to Newton's first law. second law. third law. third law When a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to differences in times. masses. forces. momenta. masses Consider a gun with a pellet that is more massive than the gun. The firing speed is greater for the pellet. recoiling gun. both are the same none of the above recoiling gun The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun because velocity is conserved. when momentum is conserved. if the masses of the bullet and gun are equal. when both velocity and momentum are conserved. none of the above if the masses of the bullet and gun are equal. A 5000-kg freight car crashes into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg freight car? 4 m/s 6 m/s 5 m/s 8 m/s none of the above 6 m/s While driving down the highway a lovebug spatters onto your windshield. Which undergoes the greater change in momentum during the time of contact? your car the lovebug both the same both the same Two billiard balls having the same mass roll toward each other at the same speed. What is the net momentum of the two-ball system? 10 kg•m/s 0 kg•m/s not enough information 0 kg•m/s