A 100 watt electric bulb is used for five hours. how much energy is consumed by the bulb

0.5kWh

Explanation:

Given, power of the electric bulb,

P=100W=(100/1000)kW=0.1kW ;

time for which bulb is used, t=5h

As P=

or W=Pt

or W=0.1kW×5h= 0.5kWh

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.