An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
A. 4.50N B. 4.67N C. 5.50N D. 6.67N E. 8.50N Correct Answer: Option C – 5.50N Explanation: Upthrust in water Uw = 10-7 = 3N Uw=pvg; 3=1000×v×10 V=3×10−³m³ UL is upthrust in liquid=1500×3×10−³×10 = 4.5N UL=Wa-WL WL = 10-4.5...
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
A. 0.02s B. 0.20s C. 0.83s D. 1.20s E. 50.00s Correct Answer: Option D – 1.20s Explanation T = t/no. of oscillation = 1 x 60/50 = 1.2s
A girl whose mass is 55kg stands on a spring-weighing machine inside a lift. When the lift starts to ascend its acceleration is 2ms1. What will be the reading on the machine? (Take g = m/s²)
A. 66 kg B. 55 kg C. 44 kg D. 22 kg E. 11 kg Correct Answer: Option A – 66 kg Explanation Reading = mg + ma = m(g + a) = 55(10 + 2) = 660N = 66kg
A plane inclined at an angle at 30° to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is?
A. 40√3N B. 60N C. 120N D. 200N E. 240N Correct Answer: Option C – 120N Explanation E = M.A/V.R ; 50/100 = M.A/2 M.A = 1; L/E = 1 E = L = 120NProducts
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