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College Physics
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What is the appropriate unit for J, if the preceding equation is to be homogenous in units?
1
6.15. Express the kinetic energy-(mass)(speed)' of a car with a mass of 1200 kg and
2
moving at speed of 100 kmh using SI, BG, and U.S. customary units. Show the
in Phoenix, Arizona, the inside room temperature is maintained"
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What is the appropriate unit for J, if the preceding equation is to be homogenous in units?
1
6.15. Express the kinetic energy-(mass)(speed)' of a car with a mass of 1200 kg and
2
moving at speed of 100 kmh using SI, BG, and U.S. customary units. Show the
in Phoenix, Arizona, the inside room temperature is maintained
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- A typical baseball has a mass of 0.145 kg. Some pitchers can throw a baseball with a speed of about 103 miles per hour, or about 46.0 m/s. What is the kinetic energy (in J) of a typical baseball moving at this speed?arrow_forwardHow much work (in J) must be done to lift a stack of bricks, which has a mass of 700 kg, from the ground to a height of 13 m? (g = 10 m/s2)arrow_forwardSuppose a car travels 108 km at a speed of 30.0 m/s, and uses 1.90 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.30 ✕ 108 J per gallon.) (a) What is the force (in N) exerted to keep the car moving at constant speed? (Enter a number.)686.1N (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s? (Enter a number.)?gallonsarrow_forward
- Suppose it takes 5 ft-lb of work to compress a spring from its natural length of 4 ft to a length of 2 ft. Find the work it takes to stretch the spring from its natural length to a length of 7 ft. Be sure to write the units for your answer.arrow_forward29. What is the kinetic energy of a 1200 kg car whose velocity is 40 km/hr? Group of answer choices 148.15 kJ 740.74 kJ 14.81 kJ 74.07 kJ No answerarrow_forwardDuring an energy-efficiency test, a student pulls a toy car up a ramp that is 2.5 m long. The student exerts a force of magnitude0.34 N parallel to the ramp. The toy has a mass of 75 g, and its height increases by 1.1 m. (a) Calculate the work done in pullingthe car up the ramp. (b) Calculate the energy output in raising the car 1.1 m. (c) Calculate the ramp's efficiency.arrow_forward
- A car of 850 kg drives at a constant speed of 20 m/s (appromately 45 mph). It is subject to a combination of friction and drag force of 420 N. What power is required from the car's engine to drive the car on level ground, in kW (kiloWatts)? Use g = 10 m/s2. Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardWhat is the kinetic energy of a car that is traveling at 15.5 m/s if it has a mass of 1343 kg? answer in exponential form provide steps pleasearrow_forwardThe rate of energy use in a typical house is about 2 kW. If the kinetic energy of a car (mass 1358 kg) is equal to the total energy used by the house in 1 min, what is the car's speed? m/sarrow_forward
- The kinetic energy of a 1000.01-kg car is 6.201 × 105 J. How fast is the car moving?arrow_forwardThe energy needed to increase the speed of a certain car from 22 m/s to 44 m/s is 240 kJ. At what speed is the car is kinetic energy equal to 240 kJ? arrow_forwardAn object has 100 J of kinetic energy. If friction does 20J of work on the object, how much energy does the object now have? Please use this formula KEi+PEi+W=KEf+PEfarrow_forward
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