Saved Bookmarks
| 1. |
an objest of mass 20 g lift up to a height of 200 cm for 10 sec what will be power in this case if g is 10m/s2 also clculate energy if same object is start moving with a speed of 10 m per second |
|
Answer» Mass ,m = 20 g = 20/1000 = 0.02KGheight ,h = 200CM = 200/100= 2mTime ,t = 10sAcceleration due to gravity ,g = 10m/s²velocity ,v = 10m/sTo FIND:-Power ,PEnergy Solution:-As we know that Power is defined as the RATE of doing work .• P = W/tSubstitute the value we get→ P = mgh/t→ P = 0.02×10×2/2→ P = 0.4/2→ P = 0.2Therefore, the power of object is 0.2 watt.Now , calculating the Energy • K.E = 1/2mv²Substitute the value we get→ K.E = 1/2×0.02×10²→ K.E = 1/2×0.02×100→ K.E = 1/2×2→ K.E = 1 Joule Therefore, the energy of the object is 1 Joule. |
|