A motorcycle starting from rest is uniformly accelerated such that its velocity in 10s is 72kmhr¯¹. What is its acceleration?
A. 108ms-2 B. 86ms-2 C. 4ms-2 D. 2ms-2 Correct Answer: Option D = 2ms-2 Explanation where u = o m/s, t = 10s, v = 72kmhr−1 —> (72 X 1000) / 3600 : v = 20 m/s Acceleration (a) = ( v – u ) / t —> (20 – 0) / 10 : a =...
The magnitude of the force experienced by a charge of 1.6 x 10^−8C in a uniform electric field of intensity 5 x 10^5NC¯¹ is
A. 3.2 x 10−14 N B. 8.0 x 10−13 N C. 8.0 x 10−3 N D. 3.1 x 1013 N Correct Answer: Option B = 8.0 x 10−13 N
What factors determine the frequency of a note emitted by a vibrating string?
A. Amplitude of vibration, force constant of string and length of string B. Amplitude of vibration, force constant of string, and tension in the string C. Mass per unit length of string, tension in string and length of the string D. Force constant of string, tension...
A 500N box rests on a horizontal floor. A constant horizontal force is exerted on the box so that it moves through 8m. If the coefficient of kinetic friction between the floor and the box is 0.22, calculate the workdone on the box
A. 880J B. 440J C. 400J D. 110J Correct Answer: Option A = 880J
The velocity of sound in air at 15°C is 35400ms¯¹. Calculate the velocity at 47°C
A. 790ms¯¹ B. 602ms¯¹ C. 358ms¯¹ D. 322ms¯¹ Correct Answer: Option C = 358ms¯¹Products
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