The magnitude of the force required to make an object of mass M move with speed V in a circular path of radius R is given by the expression.
A. mr/v B. (mr)²/v C. mv²/r D. mv/r² E. mv/r Correct Answer: Option C – mv²/r
Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is
A. 1:50 B. 3:20 C. 3:4 D. 4:3 E. 20:3 Correct Answer: Option C – 3:4 Explanation Rx = 15/0.2 = 75 Ry = 20/0.2 = 100 Rx : Ry = 75 : 100 = 3 : 4
The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms−²)
A. 25N B. 90N C. 96N D. 250N E. 960N Correct Answer: Option D – 250N Explanation Efficiency = M.A/V.R x 100% = 80/100 = 120 x 10/E E = 250NA ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms−¹ and rebounds with the same speed. Determine the impulse experienced by the ball?
A. 20.0kg ms−¹ B. 10.0kg ms−¹ C. 5.0kg ms−¹ D. 1.3kg ms−¹ E. 0.0kg ms−¹ Correct Answer: Option A – 20.0kg ms−¹ Explanation Impulse = Ft = mu – (-mu) = mu + mu = 2mu = 2 x 5 x 2 =...
The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body?
A. 50m B. 65m C. 175m D. 225m E. 300m Correct Answer: Option D – 225m Explanation Distance of A = 1/2 x (10 + 20) x 5 = 1/2 x 30 x 5 = 75m. Distance of B = 20 x 5 = 100m Distance of C = 1/2 x 5 x 20 = 50/225 ∴ Total distance is...Products
-
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
Original price was: ₦1,000.00.₦300.00Current price is: ₦300.00.
-
Co-Ownership Structures and Land Acquisition Methods in Nigeria
Original price was: ₦1,000.00.₦300.00Current price is: ₦300.00.
-
Rights in Community Land and Fundamental Land Concepts in Nigeria
Original price was: ₦1,000.00.₦300.00Current price is: ₦300.00.
-
Customary Land Control and the Origins of Nigeria's Land Use Act
Original price was: ₦1,000.00.₦300.00Current price is: ₦300.00.
-
Land Ownership Principles and Transaction Laws in Nigeria
Original price was: ₦1,000.00.₦300.00Current price is: ₦300.00.