Physics

1The principle of moments states that for equilibrium,

2A boy of mass 50 kg climbs 4 m in 10 s (g = 10 m/s²). His power is

3A body of mass 2 kg moving at 10 m/s has momentum

4A body floats in water because

5A spring of constant 400 N/m is compressed 0.1 m. The energy stored is

6A uniform metre rule is balanced at its 50 cm mark. A 2 N weight hung at 20 cm is balanced by a weight at 80 cm of

7A machine has an efficiency of 75% and a velocity ratio of 4. Find its mechanical advantage.

8A lever has a load of 600 N at 0.2 m from the fulcrum. The effort needed at 1.2 m is

9A pump lifts 100 kg of water through 10 m in 20 s (g = 10 m/s²). Its power is

10A pulley system lifts a 600 N load with an effort of 200 N. The mechanical advantage is