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Force Motion and Energy


13. 

The device employed to convert electrical energy into mechanical energy is

Answer : B. Motor

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14. 

The velocity ratio of a screw jack is

Answer : A. 2Πl/p

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15. 

The maximum displacement of a vibrating body from its mean position is called

Answer : C. amplitude

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16. 

Speeds of bodies exceeeding the speed of sound are called

Answer : A. Supersonic

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17. 

Velocity of a body is

Answer : D. the rate of the change of its position in a definite direction

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18. 

Consider the following points:
1. the acceleration is zero when the bob passes through the mean position
2. in each cycle the bob attains a given velocity twice
3. both acceleration and velocity of the bob are zero when it reached its extreme position during its oscillation
4. the amplitude of oscillation of the simple pendulum decreases with time

Answer : D. 2, 3 and 4

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