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MDCAT - Practice Test - Physics - Work and Energy Quiz

Attempt 10 MCQs on MDCAT - Practice Test - Physics - Work and Energy | Quiz 9

81. A car of mass 1000 kg accelerates from 10 m/s to 20 m/s. Work done by engine is:



82. A 10 kg mass is lifted at constant speed 2 m/s. What power is required? (g=10)



83. A pendulum bob of mass 2 kg is released from height 2 m. Find speed at lowest point (g=10).



84. A 0.5 kg ball has 50 J gravitational PE. How high is it? (g=10)



85. A 5 kg bucket is lifted 10 m at constant speed 2 m/s. Power delivered is (g=10):



86. A motor receives 1000 J electrical energy and does 800 J mechanical work. Its efficiency is:



87. A 2 kg block slides 10 m on a rough surface (μ=0.2). Work done against friction (g=10) is:



88. A 10 kg box is pulled up a 30° incline at constant speed 5 m/s. Find power (g=10, μ=0).



89. An object of mass 4 kg has KE 200 J. Its speed is:



90. A 5 kg mass has gravitational PE 100 J. Height above reference is (g=10):



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