Which combination of the above is true of sliding friction?
I. The frictional force is independent of the area of the surfaces in conduct II. The frictional force depends on the nature of the surfaces in contact III. The frictional force depends on the speed of sliding IV. The frictional force is directly proportional to the...A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if starting from rest; the mass acquires a velocity of 4ms‾¹ in 8s [g = 10ms−²2]
A. 5N B. 50N C. 95N D. 105N Correct Answer: Option D – 105N Explanation Tension = Force of gravity + acceleration force = mg + ma a=v−u/t = 4−0/8 = 0.5 ms−² Tension = 10×10+10×0.5 = 100 + 5 =...
A stream is flowing at 0.75ms‾¹ and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.
A. 1.50ms‾¹ B. 1.00ms‾¹ C. 0.86ms‾¹ D. 0.65ms‾¹ Correct Answer: Option C – 0.86ms‾¹ Explanation Let the velocity of the boat = Vm/s 0.75/V = adj/hyp = Cos 30° 0.75/V = 0.8660 ∴ V = 0.75/0.8660 V = 0.866...
A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is?
A. 4.0 x 102N B. 2.0 x 103N C. 4.0 x 103N D. 4.0 x 104N Correct Answer: Option C = 4.0 x 103N Explanation Work done = kinetic energy of the stone ½Fe= ½mv² Given m = 500g = 0.5kg; v = 40m/s ; e = 20cm = 0.2m F=mv²/e = 0.5×(40)²/0.2 = 4.0 × 103...Products
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