To rank items as equivalent, overlap them. Immediately after lunch, for each case, rank from greatest to least the speed of the formerly hungry fish. 288 can be rounded to 290N/s, which is our final answer. Significant figures are at 3, we need to bring them to 2. p=mv = Ft=mv, but with Newtons instead of kg x m. 43.5 rounds up to 44, so our final answer is 44 kg x m/s How much impulse stops a 60-kg carton sliding at 4.8 m/s when it meets a rough surface?Įxpress your answer to two significant figures and include the appropriate units. We can plug and chug for momentum.įinally, we must put this into 2 significant figures. So, using the acceleration formula, a=average v/ average t, we have a=10 and t=2.9 We are still missing a velocity, but we have an acceleration and a time. We can assume acceleration is equal to 10m/s^2 because we were not given a velocity or an acceleration and we were not told this was happening off of Earth's surface. 20.8 (or 21 in significant figures) kg x m/s What impulse occurs when an average force of 15 N is exerted on a cart for 2.9 s ? Overall, we are looking to solve for p (momentum) in p=mv. Compared to the pucks in the video, this pair of pucks will rotate at the same rate What is the momentum of an 8.0-kg bowling ball rolling at 2.6 m/s ?Įxpress your answer to two significant figures and include the appropriate units. Otherwise, we keep the experiment the same. How much of the balls' kinetic energy is dissipated? None of it Suppose we replace both hover pucks with pucks that are the same size as the originals but twice as massive. In the collision between the sad balls, how much of the balls' kinetic energy is dissipated? Half of it Now, consider the collision between two happy balls described in Part A.
#Textlab ch 8 momentum free
The target balls are free to move, and all the balls have the same mass. Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball. In which is momentum conserved: an elastic collision or an inelastic collision? Momentum is conserved in elastic and inelastic collisions. The trucks will stick together after the collision and move to the right. Click "Reset." Now, predict what will happen if you increase the mass of the green truck so that it is greater than the mass of the red truck. Click "Reset." Now, predict what will happen if you change the velocity of the red truck so that it has a magnitude smaller than that of the green truck but is positive. Click "Reset." Now, predict what will happen if you change the velocity of the red truck so that it has a magnitude smaller than that of the green truck but is negative. The trucks will stick together after the collision and move to the left. Predict what will happen if you reduce the magnitude of the velocity of the green truck to a magnitude smaller than that of the red truck. The trucks will stick together after the collision and not move. Before you click "Play," predict what will happen if the red and green truck with equal mass and equal magnitude of velocity collide. whether the collision is elastic or inelastic. remains the same When two vehicles collide, momentum is conserved _. If the new fluid leaves the rocket at the same speed as the water in the video, what will be the ratio of the horizontal speed of our rocket to the horizontal speed of the rocket in the video after all the fluid has left the rocket? (Ignore air resistance.) 2/3 When a big fish swims into an oncoming smaller fish and swallows it, the momentum of the two-fish system _. Suppose we repeat the experiment from the video, but this time we use a rocket three times as massive as the one in the video, and in place of water we use a fluid that is twice as massive (dense) as water. her hand is made to bounce from the bricks. Cassy can get more force on the bricks she breaks with a blow of her bare hand when _. The quantity that is called impulse can be measured by the _. Hewitt need to have done to exert an even greater force than he did in his karate demonstration? Increase the change in momentum, and decrease the time duration. Hewitt break the piece of wood? He causes a change in momentum of his hand over a short period of time. Hewitt able to break a piece of wood in his demonstration? He moves his hand very quickly.
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