Question 1 (1 point) Use the conservation of momentum to answer the following question. A 7.0-kg fish swimming at a speed of 1.3 m/s swallows an absent-minded 2.8-kg fish swimming toward it at 1.4 m/s. The speed of the larger fish after lunch is m/s. Your Answer: Answer Question 2 (1 point) A 500-kg car moving at 6 m/s brakes to a stop in 5 s. The average braking force is _ __ N, kg m/s2. Hint: Use two equations to solve this question. Your Answer: Answeris __ N , kg m / s2 . Hint: Use two equations to solve this question. Your Answer: Answer Question 3 (1 point) Consider a hydraulic press. When the input piston is depressed 49 cm, the output piston is observed to move 2.3 cm. On the same press, an input force of 185 N can raise no more than _ _ _ N. Your Answer: AnswerQuestion 21 (1 point) Convert 563.28 K to OF. Report to at least 2 decimal places. Your Answer: AnswerQuestion 9 (1 point) A TV set is pushed a distance of 7 m with a force of 73 N that is in the same direction as the set moves. How much work, in J, is done on the set? Your Answer: AnswerQuestion 23 (1 point) How many J are required to heat 239 g of water from 12 C to 92 .C? The specific heat of water is 4.184 J / (g C). Your Answer:Question 5 (1 point) Use conservation of energy to solve the following question. A car moving at 50 km/h skids 50 m with locked brakes. How far will the car skid with locked brakes if it is traveling at 250 km/h? Kinetic Energy = 0.5*m*v2 Work = F*D Both are types of energy so Work = Kinetic Energy. Your Answer: AnswerQuestion 28 (1 point) An unknown metal weighing 21 grams takes 54 J to raise its temperature from 25.7 .C to 33.0 .C. What is the specific heat of the unknown metal in J / (g.C)? Your Answer: Answer Question 29 (1 point) How many cal are required to heat 148 g of water from 25 .C to 96 .C? The specific heat of water is 1 cal / (goC). Your Answer: AnswerQuestion 7 (1 point) If you exert 354 J in 3 s, your power output is W. Your Answer: AnswerQuestion 40 (1 point) Convert 142.87 K to C. Report to at least 2 decimal places. Your Answer: AnswerQuestion 18 (1 point) Use the conservation of momentum to answer the following question. If an astronaut whose total mass is 102 kg ejects 0.021 kg of gas at a speed of 94 m/s from her propulsion pistol, her recoil speed is ___ m/s. Answer to 3 decimal places. Your Answer: AnswerQuestion 34 (1 point) Convert 165.66 OF to C. Report to at least 2 decimal places. Your Answer: Answer Question 35 (1 point) Convert 169.60 OF to K. Report to at least 2 decimal places. Your Answer: AnswerQuestion 13 (1 point) A machine puts out 161 W of power for every 1,270 W put into it. The efficiency of the machine is_ %. Your Answer: AnswerQuestion 11 (1 point) Use the conservation of momentum to answer the following question. A 23-kg girl and a 49-kg boy face each other on friction-free roller blades. The girl pushes the boy, who moves away at a speed of 1.3 m/s. The girl's speed is m/s. Your Answer: Answer Question 12 (1 point) Using 8,100 J of work, a toy elevator is raised from the ground floor to the second floor in 7 s. How much power does the elevator use, in W? Your Answer: