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Changing Mass. An open-topped freight car with mass 24,000
Chapter 10, Problem 29E(choose chapter or problem)
Changing Mass?. An open-topped freight car with mass 24,000 kg is coasting without friction along a level track. It is raining very hard, and the rain is falling vertically downward. Originally, the car is empty and moving with a speed of 4.00 m/s. (a) What is the speed of the car after it has collected 3000 kg of rainwater? (b) Since the rain is falling downward, how is it able to affect the horizontal motion of the car?
Questions & Answers
QUESTION:
Changing Mass?. An open-topped freight car with mass 24,000 kg is coasting without friction along a level track. It is raining very hard, and the rain is falling vertically downward. Originally, the car is empty and moving with a speed of 4.00 m/s. (a) What is the speed of the car after it has collected 3000 kg of rainwater? (b) Since the rain is falling downward, how is it able to affect the horizontal motion of the car?
ANSWER:Solution 29E Step 1 of 4: (a) What is the speed of the car after it has collected 3000 kg of rainwater Here in the given problem, we need to calculate the final velocity of the car v after f travelling in rain adding 3000 kg of water on it, with initial velocity v =4 m/s andiinitial mass of car m= 24000 kg using conservation of momentum, Given data, Initial mass of car, m= 24000 kg Final mass of car, M=mass of car + mass of water= 24000 + 3000 = 27000 kg Initial velocity v =4 m/s i To find, final velocity, v =f