An elevator of total mass 800 kg accelerates upward at 2.0 m/s^2. What is the tension in the supporting cable? (Take g = 9.8 m/s^2)
Answer and explanation
Correct answer: B. 9,440 N
- Step 1: By Newton's second law: T - m g = m a. Step 2. T = m (g + a). Step 3. T = 800 (9.8 + 2.0) = 800 11.8 = 9,440 N. Answer: 9,440 N. Why not the others: 7,840 N is weight at rest (mg); 6,240 N is downward acceleration; 1,600 N is m*a alone.
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