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A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?
- a)3234 J and 0 J, respectively
- b)3234 J and 3234 J, respectively
- c)6468 J and 0 J, respectively
- d)6468 J and 6468 J, respectively
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A weight lifter lifts a 275 kg barbell from the ground to a height of ...
Because the weight of the barbell (force acting downward) is 
or about 2750 N, it follows that the weightlifter must exert an equal and opposite force of 2750 N on the barbell. The work done in lifting the barbell is therefore W = Fd cos θ = (2750 N)(2.4 m)(cos 0) ≈ 7000 J. Using the same equation, it follows that the work done to hold the barbell in place is W = Fd cos θ = (2750 N)(0 m)(cos θ) = 0 J. Because the barbell is held in place and there is no displacement, the work done is zero.
or about 2750 N, it follows that the weightlifter must exert an equal and opposite force of 2750 N on the barbell. The work done in lifting the barbell is therefore W = Fd cos θ = (2750 N)(2.4 m)(cos 0) ≈ 7000 J. Using the same equation, it follows that the work done to hold the barbell in place is W = Fd cos θ = (2750 N)(0 m)(cos θ) = 0 J. Because the barbell is held in place and there is no displacement, the work done is zero.
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A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer? for MCAT 2025 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for MCAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer?.
A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer? for MCAT 2025 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for MCAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A weight lifter lifts a 275 kg barbell from the ground to a height of 2.4 m. How much work has he done in lifting the barbell, and how much work is required to hold the weight at that height?a)3234 J and 0 J, respectivelyb)3234 J and 3234 J, respectivelyc)6468 J and 0 J, respectivelyd)6468 J and 6468 J, respectivelyCorrect answer is option 'C'. Can you explain this answer?.
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