17) Under what conditions could the momentum of a car with a mass of 1000 kilogr

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17) Under what conditions could the momentum of a car with a mass of 1000 kilograms equal the momentum of a car with 2000 kilograms? (Choose as many as apply.) (A) Because of the law of conservation of momentum, the two objects could never have the same momentum (B) The 1000 kg car is going twice the speed of the 2000 kg car. (C) The two cars are going the same speed and the 1000 kg car is pulling a trailer with a mass of 1000 kg. (D) The speed of the 2000 kg car is half the speed of the 1000 kg car. (E) None of these answers is correct
18) If a force of 10N acts on a 5kg object for 10 s, what is the object’s change in momentum? (A) 100 N•s (B) 500 N•s (C) 50 N•s (D) none of these
26) A person who has a mass of 50 kg sits on a lever and lifts a mass of 100kg a distance of .5m. What is the mechanical advantage of the lever? (A) 1 (B) 1 1/2 (C) 2 (D) 50 (E) 100
27) Using an inclined plane which is only 50% efficient, what is the total work input required to lift a weight of 100N a distance of 10m? (A) 2000 joules (B) 1000 joules (C) 5000 joules (D) none of these
19) What conditions must be met if a man-made satellite is to attain an elliptical orbit around earth? (Choose as many as apply.) (A) It must be launched with a tangential speed of 0. (B) It must be launched with a tangential speed greater of 8km/s. (C) It must be launched with a tangential speed greater than 8km/s. (D) It must be launched horizontally at a distance over 150 km above the earth. (E) It must be launched vertically with a speed of 8km/s
17) Under what conditions could the momentum of a car with a mass of 1000 kilograms equal the momentum of a car with 2000 kilograms? (Choose as many as apply.) (A) Because of the law of conservation of momentum, the two objects could never have the same momentum (B) The 1000 kg car is going twice the speed of the 2000 kg car. (C) The two cars are going the same speed and the 1000 kg car is pulling a trailer with a mass of 1000 kg. (D) The speed of the 2000 kg car is half the speed of the 1000 kg car. (E) None of these answers is correct
18) If a force of 10N acts on a 5kg object for 10 s, what is the object’s change in momentum? (A) 100 N•s (B) 500 N•s (C) 50 N•s (D) none of these
26) A person who has a mass of 50 kg sits on a lever and lifts a mass of 100kg a distance of .5m. What is the mechanical advantage of the lever? (A) 1 (B) 1 1/2 (C) 2 (D) 50 (E) 100
27) Using an inclined plane which is only 50% efficient, what is the total work input required to lift a weight of 100N a distance of 10m? (A) 2000 joules (B) 1000 joules (C) 5000 joules (D) none of these
19) What conditions must be met if a man-made satellite is to attain an elliptical orbit around earth? (Choose as many as apply.) (A) It must be launched with a tangential speed of 0. (B) It must be launched with a tangential speed greater of 8km/s. (C) It must be launched with a tangential speed greater than 8km/s. (D) It must be launched horizontally at a distance over 150 km above the earth. (E) It must be launched vertically with a speed of 8km/s

18) If a force of 10N acts on a 5kg object for 10 s, what is the object’s change in momentum? (A) 100 N•s (B) 500 N•s (C) 50 N•s (D) none of these
26) A person who has a mass of 50 kg sits on a lever and lifts a mass of 100kg a distance of .5m. What is the mechanical advantage of the lever? (A) 1 (B) 1 1/2 (C) 2 (D) 50 (E) 100
27) Using an inclined plane which is only 50% efficient, what is the total work input required to lift a weight of 100N a distance of 10m? (A) 2000 joules (B) 1000 joules (C) 5000 joules (D) none of these
19) What conditions must be met if a man-made satellite is to attain an elliptical orbit around earth? (Choose as many as apply.) (A) It must be launched with a tangential speed of 0. (B) It must be launched with a tangential speed greater of 8km/s. (C) It must be launched with a tangential speed greater than 8km/s. (D) It must be launched horizontally at a distance over 150 km above the earth. (E) It must be launched vertically with a speed of 8km/s

Explanation / Answer

18) change in momentum = force x time = 10 x 10 = 100 Ns

26) output weight = 100 kg

input weight = 50 kg

=> mechanical advantage = output force/input force = 2

27) Work = F.d/efficiency = 100 x 10/0.5 = 2000 joules

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