Physics Review Question Unit: Potential energy Year: 1989 Question#: 23 Question: An object gains 10 joules of potential energy as it is lifted vertically 2.0 meters. If a second object with one-half the mass is lifted vertically 2.0 meters, the potential evergy gained by the second object will be (1 ) 10. J (2 ) 20. J (3 ) 5.0 J (4 ) 2.5 J What is this question really asking? Explanation by: Chris B. [ Return to question menu ] Answer 1 10. J INCORRECT Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top Answer 2 20J INCORRECT Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top Answer 3 5.0 J CORRECT Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh. Depleting the mass by half has a direct relationship with the answer. return to top Answer 4 2.5 INCORRECT Dealing wiht this question you must first plug information into the potential energy formula. PE=mgh, and take these steps. (2m)(10m/s2)(m)=10J mass is equal to 0.5kg, but this is just the first part. The second object is decreased by half =0.25Kg. Plug that into the equation GPE = mgh return to top What's this question really asking? How is mass related to gravitational potential energy? return to top |
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