The linear acceleration (a) of a body rotating along a circular path of radius (

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Question
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of ? rad / s², is
Options
A. a = ?/ r
B. a = ?.r
C. a = r / ?
D. none of these

Correct Answer

a = ?.r

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3. Whenever a force acts on a body and the body undergoes a displacement, then
Options
A. work is said to be done
B. power is being transmitted
C. body has kinetic energy of translation
D. none of these

5. In a screw jack, the effort required to lift the load is given by(where W = Load lifted, ? = Helix angle, and ? = Angle of friction.)
Options
A. P = W tan (? - ?)
B. P = W tan (? + ?)
C. P = W tan (? - ?)
D. P = W cos (? + ?)

7. A block ot mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
Options
A. increase
B. decrease
C. not be effected

9. The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)
Options
A. h/2
B. h/3
C. h/4
D. h/6

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