A body of weight 50 N is placed on a smooth surface. If the force required to move the body on the surface is 30 N, the coefficient of friction is
(A) 0.6
(B) 0.4
(C) 0.3
(D) 0.8
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A mixture of CuS (molecular weight = `M_(1)`) and `Cu_(2)S` (molecular weight `=M_(2)`) is oxidised by `KMnO_(4)` (molecular weight `=M_(3)`) in acidi
Correct Answer - `(M_(1))/(6), (M_(2))/(8), (M_(3))/(5)`
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Calculate the force required to move a block of mass 20 kg resting on a horizontal surface, if μs = 0.3 and g = 9.8 m/s^2.
Given: m = 20 kg, μS = 0.3, g = 9.8 m/s2 To find: Force required (F) Formula: FS = μSN = μSmg Calculation: From formula, FS = 3 × 20 × 9.8 = 58.8N The force required to move...
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Take a block of ice and place it on a smooth surface, push the block with some net force. Now increase the net force and push it again.
C) Larger the net force larger the acceleration
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The average weight of 5 packets is 24 kgs and the average weight of another 10 packets is 12 kgs, then average weight of 15 packets is ……………….
Correct option is (B) 16 Kgs Average weight of 15 packets \(=\frac{5\times24+10\times12}{15}\) \(=\frac{120+120}{15}\) \(=\frac{240}{15}\) = 16 kg
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The average weight of 5 packets is 24 kgs and the average weight of another 10 packets is 12 kgs, then average weight of 15 packets is ……………….
2 Answers
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Weight of a body on the surface of the earth is W. Then weight of the same body on the surface of a planet whose mass is double
D) \(\cfrac{2\,W}9\)
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Pressure = ………… A) Force B) Force x area C) Area / force D) Force / area
D) Force / area
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c. The in weight. The weight of \( 6 students \) are \( 49 kg , 52 kg , 51 kg , 58 kg \), and \( 55 kg \) respectively. Find the mean weight.
MEAN = SUM OF OBSERVATION / TOTAL NO. OF OBSERVATION = 49+52+51+58+55/5= 265/5= 53
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Push a heavy box with a small force. It does not move. Now gradually increase the force, the box till does not move.
A) force increases, friction increases
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Assertion (A): A ball is moving fast on smooth surface than rough surface even you apply same force on it.
D) Both Assertion and Reasons are correct and “R” is correct explanation for Assertion.
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