find momentum find momentum find momentum 1. WHAT IS THE WEIGHT OF A 1KG MASS OB
ID: 778843 • Letter: F
Question
find momentum find momentum find momentum 1. WHAT IS THE WEIGHT OF A 1KG MASS OBJECT ON PLANET EARTH? A SCOOTER WEIGHS 120 kg Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4 2. 3. A rocket sled accelerates to 50 m/s. When the rocket engine stops, the sled skids along its rails. If the coefficient of friction is 0.5, how fast is the sled moving after 2.50s 4. A 0.105 kg hockey puck is traveling at 12 m/s when it is struck by a stick. As a result, the puck travels at 15 m/s in the opposite direction. If the contact between the stick and puck lasted 0.05 s what was the force? s. A group of people are pushing a stalled car with a mass of 1100 kg. If they push with a net force of 350 Newtons for 10 seconds, what is car's final velocity? 6. A football player slows an 85 kg opponent down from 6m/s to 2m/s. How much work is done on the opponent? z. Tor F An impact causes and is equal to a change in momentum. 8. A 50 kg boulder raised from the ground to a height of 2 m in a time of 10 tential energy with respect to the ground seconds possesses a gravitational potExplanation / Answer
1) weight w = mg = 1*9.8 = 9.8 N
2) force of friction
f = uN but N = mg
Thus:
f = umg = 0.4*120*9.8 = 470.4 N
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