A 0.10 kilogram model rocket's engine is designed to deliver an impulse of 6.0 newton seconds. If the rocket engine burns for 0.75 second, what average force (in newtons) does it produce?
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- A 25 gram bullet is fired at 124 m/s into a 5.00 Kg block, the bullet penetrates the block and exits at 99 m/s. what is the speed of the block after the bullet goes thru it?A 49 kg boy on roller skates moves with a speed of 4 m/s. He runs into a 41 kg girl on skates. Assuming they cling together after the collision, what is their speed (in m/s)? (Assume the girl is initially at rest.) m/sYou have two vectors: A = 7.27î + 3ĵ and B = 4î – 0.95ĵ + 12k. If vector A represents an initial momentum vector, and vector B represents a final momentum vector, what is the z component of the impulse?
- A 65-kg ice hockey goalie, originally at rest, catches a 0.145-kg hockey puck slapped at him at a velocity of 35 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities be in this case? Vp,f= __ m/s vV,f= __ m/sA 17.8 kg sled is sitting at rest on level ice, and this sled is hit by another sled that is twice as massive. After the collision, the sleds stick together and move off at 6.3 m/s. How fast was the larger sled initially moving just before the collision?A 2210 kg car experiences an impulse of 20,000.0 N · s during a collision with a wall. If the collision takes 0.43 s, what was the velocity of the car just before the collision? 27 m/s 18 m/s 9 m/s 10 m/s 12 m/s
- Two balls approach each other with equal speeds of 20 m/s. One ball has a mass of 5.0-kg and the other has a mass of 10.0-kg. They collide in a perfectly inelastic collision. The speed of the balls just after the collision is approximately: O 6.7 m/s O 1.3 m/s 30 m/s 0 m/sA 20 gram ball with the speed of 25 cm/s is moving to the right makes an elastic head– on collision with a 40 g ball moving to the left at 0.15 m/s. After the collision the ball with less mass moves to the left at 16 m/s. What is the velocity of the 2nd ball after the collision?A block of mass mm = 16 kgkg has a speed VV and is behind a block of mass MM = 65 kgkg that has a speed of 0.5 m/sm/s. The surface is frictionless. The blocks collide and couple. After the collision, the blocks have a common speed of 0.9 m/sm/s. In the figure, the loss of kinetic energy of the blocks due to the collision is closest to: 7.7 J 25 J 26 J 9.3 J 76 J
- A ball with an initial velocity of 7.5 m/s and mass 1.8 kg moves at an angle 55.5° above the horizontal. The ball hits a vertical wall and bounces off so that it is again moving at 55.5° above the horizontal with the same speed. See the figure. What is the magnitude of the impulse delivered by the wall, in kilogram meters per second? J=During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.149 kg baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 15.9 m/s, shatters the glass as it passes through, and leaves the window at 10.5 m/s with no change of direction. What is the direction of the impulse that the glass imparts to the baseball? opposite the direction of the ball's motion neither of these in the direction of the ball's motion Calculate the magnitude of this impulse (a positive number). impulse: The ball is in contact with the glass for 0.0105 s as it passes through. Find the magnitude of the average force of the glass on the ball (a positive number).A block of mass m = 5.0 kg, moving on frictionless surface with a speed vi = 10 m/s, makes a sudden perfectly elastic collision with a second block of mass M which is originally at rest, as shown in the figure. Just after the collision, the 5.0 kg block recoils at a speed of 2.5 m/s. What is the momentum of the second block after collision? 12.5 kg m/s 10 kg m/s 50 kg m/s 62.5 kg m/s m before M Vf m after M