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- I am driving down the street at 23.4 mi/h and suddenly I see a squirrel. I slam on the brakes in 0.89 seconds to avoid hitting the squirrel. Luckily, he got away. With what force in kiloNewtons did the 455 kg car come to a stop? Round to the nearest whole hundredth, and enter the magnitude, which does not include negatives.Cedar has been trying to get Liam's attention for weeks. He decides to make a paper airplane to hit Liam in the back of his head (and grab his attention). If the paper airplane flies 2.64 m [W 26˚ N] and then is caught by the wind, which causes it to travel 3.21 m [S 12˚ E]. What is the paper airplane's total displacement? (please hand-write it and make it clear)A 390 kg cannon sits on a frozen lake. It fires a 5.5 kg cannonball horizontally with a speed of 305 m/s. With what speed (in m/s) does the cannon recoil from the blast?
- To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. In one such episode, a 585 g falcon flying at 23.0 m/s flew into a 1.40 kg raven flying at 8.00 m/s . The falcon hit the raven at right angles to its original path and bounced back with a speed of 5.80 m/s a)By what angle did the falcon change the raven's direction of motion?A car carrying a 79-kgkg test dummy crashes into a wall at 26 m/sm/s and is brought to rest in 0.10 ss. What is the magnitude of the average force exerted by the seat belt on the dummy?A gun fires a bullet vertically into a 1.40-kgkg block of wood at rest on a thin horizontal sheet. If the bullet has a mass of 13.5 g and a speed of 310 m/s, how high will the block rise into the air after the bullet becomes embedded in it? Answer in meters.
- Solve using in lb*ft/s. 2100kg truck traveling north at 41km/h turns east and accelerates to 51km/h. What are the magnitude and direction of the change in its momentum?1.A 1500-N force is required to raise an aluminum slab (the density of aluminum is 2700 kg/m3 ) to a surface of an ocean. The force required to lift it out of the water is approximately 2.A 6-kg stone moving north at 3 m/s collides with a 4-kg lump of clay moving west at 2 m/s. The stone becomes embedded in the clay. What is the speed of the composite body after the collision? 3.A barge is 5 m wide and 7 m long. When a bulldozer pulls onto the barge, it sinks 3 cm lower in the sea water. What is the weight of the bulldozer? 4.The object shown rotates about an axis perpendicular to the paper and through point P. The kinetic energy of the object is equal to 5.6 J. If M = 1.5 kg and L = 0.75 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles. 5.What would a person who weighs 700 N on the earth weigh on a planet whose mass and radius were both 1/3 those of the earth? 6.A 3-kg particle moves in the xy plane with a…A 89.0 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 34.0 m/s. If both are initially at rest and if the ice is frictionless, how far (in m) does the player recoil in the time it takes the puck to reach the goal 25.0 m away? (Enter the magnitude.)
