In railway station, Ranga put one box in his head and Ramu put two boxes in his head of same weight. The normal force exerts more on
A) Ranga
B) Ramu
C) Both are equal
D) No normal force acts on them
1 Answers
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A train, standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. (i) What is the frequency of the whistle
Given: vs = 10 m/s, v = 340 m/s, n0 = 400 Hz Apparent frequency (n), velocity of sound (vs) in each case Formulae: i. n = n0 \((\frac{v}{v-v_s})\) ii. n = n0 \(\frac{v}{v+v_s}\) Calculation: a. As the train approaches the...
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When an object exerts a force on other object, the result will be explained by ……………… of motion.
C) Newton’s third law
2 Answers 1 views
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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After 12 years the age of Ramu is 3 times the age before he was 4 years then his present age is ………………. years.
Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...
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The force that a solid surface exerts on any object in the normal direction is called
B) Normal Force
2 Answers 1 views
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
2 Answers 7 views
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
2 Answers 2 views
The average weight of 55 students is 55 kg , and the average weight of another 45 students is 45 kg . Find the average weight of all the students .
Correct Answer - c Average = `("Sum of the quantities")/("Number of the quantities")`
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