A balloon with mass \(m\) is descending down with an acceleration \(a\) (where \(a<g\)). How much mass should be removed from it so that it starts moving up with an acceleration \(a\)?
1. | \( \frac{2 m a}{g+a} \) | 2. | \( \frac{2 m a}{g-a} \) |
3. | \( \frac{m a}{g+a} \) | 4. | \( \frac{m a}{g-a}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThree blocks with masses \(m\), \(2m\), and \(3m\) are connected by strings as shown in the figure. After an upward force \(F\) is applied on block \(m\), the masses move upward at constant speed \(v\). What is the net force on the block of mass \(2m\)? (\(g\) is the acceleration due to gravity)
1. | \(2~mg\) | 2. | \(3~mg\) |
3. | \(6~mg\) | 4. | zero |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe mass of a lift is \(2000\) kg. When the tension in the supporting cable is \(28000\) N, then its acceleration is:
(Take \(g=10\) m/s2)
1. | \(30\) ms-2 downwards | 2. | \(4\) ms-2 upwards |
3. | \(4\) ms-2 downwards | 4. | \(14\) ms-2 upwards |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is:
1. 48 N
2. 24 N
3. 12 N
4. 96 N
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology