A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction?
A. perpendicular to the circular path B. parallel to the circular path C. tangential to the circular path D. towards the center of the circle Correct Answer: Option C – tangential to the circular path Explanation AS the stone is whirled round and te string...
The stylus of a phonograph record exerts a force of 7.7 x 10−²N on a groove of radius 10^-5m. Compute the pressure exerted by the stylus on the groove
A. 2.45 x 108 Nm-2 B. 3.45 x 108 Nm-2 C. 4.90 x 108 Nm-2 D. 2.42 x 108 Nm-2 Correct Answer: Option A = 2.45 x 108 Nm-2 Explanation Pressure P = F/A = F/πr2 = 7.7 x 10-2 π x (10-5)2 = 7.7 x 10-2 π x 10-10 = 2.45 x...
Water does not drop through an open umbrella of silk materials unless the inside of the umbrella is touched. This is due to?
A. capilarity B. osmotic pressure C. viscosity D. surface tension Correct Answer: Option D – surface tension Explanation Surface tension – The tendency of a liquid surface to behave as an elastic skin
If a force of 50N stretches a wire from 20m to 20.01m; what is the amount of force required to stretch the same material from 20m to 20.05m?
A. 250N B. 200N C. 100N D. 50N Correct Answer: Option A – 250N Explanation Original length = 20m first new length = 20.01m First increase in length = 20.01m – 20m = 0.01m Second new length = 20.05m Second increase in length = 20.05 – 20m = 0.05m From...Products
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