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NCAT Practice Test - Practice Test - Physics - Work and Energy Quiz

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

91. A motor draws 120 W electrical power and delivers 90 W mechanical power. Efficiency is:



92. A 200 g ball is dropped from 10 m. Ignoring air resistance, speed just before impact (g=10) is:



93. A car of mass 1000 kg moving at 10 m/s is stopped by brakes. Work done by brakes is:



94. A spring of constant 500 N/m is compressed by 10 cm. Elastic PE stored is:



95. A 5 kg box is lifted vertically 5 m at constant speed. Work done against gravity (g=10) is:



96. A 1 kg ball is thrown vertically upward with speed 20 m/s. Work done by gravity until it reaches the highest point is (g=10):



97. A 1 kg block slides down a 30° incline of height 5 m with coefficient of friction 0.1. Find speed at bottom (g=10).



98. A 2 kg box slides down a 30° incline of length 10 m with μ=0.2. Find speed at bottom (g=10).



99. A 10 kg load is pulled up a 30° incline at 5 m/s. Efficiency of motor is 80%. What is input power? (g=10)



100. A 0.5 kg block slides down a frictionless ramp from height 2 m and compresses a spring by 10 cm. If block's speed just before hitting spring is 4 m/s, find spring constant (g=10).



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