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Correct Answer: B
Correct Answer: B
Method / Topic: Physics
The correct option matches the required rule and the given information.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Physics
Average power equals transferred mechanical energy divided by time. The lift adds 900 J in 3.0 s, so Pavg = 900 J/3.0 s = 300 W. With constant speed, this also equals the upward force mg multiplied by speed 1.5/3.0 = 0.50 m/s. This result follows from the stated physical model and consistent SI units. For MCAT physics, first identify the system, list known quantities, and choose the governing relationship before substituting numbers. Track direction, signs, exponents, and unit conversions; then test whether the magnitude is physically reasonable. Common distractors omit a round trip, confuse radius with area, ignore an inverse-square or fourth-power dependence, use peak instead of average behavior, or mix stored energy with dissipated power. In clinical and laboratory settings, the same
helps interpret imaging depth, fluid flow, electrical discharge, forces, and energy safely. A final dimensional check should reproduce the unit requested in the
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PASSAGE 1 — REHABILITATION LIFT A rehabilitation device raises a 60 kg patient vertically through 1.5 m at constant speed in 3.0 s. Treat the patient as a point mass and use g = 10 m/s². In a second trial, the device starts from rest and reaches 1.0 m/s while lifting the same patient. Ignore air resistance and cable mass. QUESTION 2: What average mechanical power is delivered to the patient during the constant-speed lift?
Explanation
Correct Answer: B
Method / Topic: Physics
The correct option matches the required rule and the given information.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Physics
Average power equals transferred mechanical energy divided by time. The lift adds 900 J in 3.0 s, so Pavg = 900 J/3.0 s = 300 W. With constant speed, this also equals the upward force mg multiplied by speed 1.5/3.0 = 0.50 m/s. This result follows from the stated physical model and consistent SI units. For MCAT physics, first identify the system, list known quantities, and choose the governing relationship before substituting numbers. Track direction, signs, exponents, and unit conversions; then test whether the magnitude is physically reasonable. Common distractors omit a round trip, confuse radius with area, ignore an inverse-square or fourth-power dependence, use peak instead of average behavior, or mix stored energy with dissipated power. In clinical and laboratory settings, the same
helps interpret imaging depth, fluid flow, electrical discharge, forces, and energy safely. A final dimensional check should reproduce the unit requested in the
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