a machine rated as 150 watt changes the velocity of a 10g mass from 4m/s to 10m/s in 4 sec. The efficiency of the machine nearly is
Answers
Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.
Verification of Archimedes’ principle
Apparatus: Spring balance, measuring cylinder, any irregular small object, thread, water
Procedure
1. Fill the measuring cylinder with water till some level. Note this reading as v1.
ii. ‘Veigh the object in air using a spring balance and note the reading w1.
iii. Immerse the object into the water in the measuring cylinder. Note the weight, w2 from the spring balance and the volume of water, v2 in the cylinder.
According to Archimedes’ principle Weight loss of an object when immersed in water = Weight of the water displaced
w - V x D
w1- w2= (v2-v1)xD
w1-w2 = (v2 - v1) x 1 (Density of water = I g/cm3)
W1- W2 =v2-v 1
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