Question
In: Physics
a) if a 75w light bulb is left on for 2.0 hrs how much work is...
a) if a 75w light bulb is left on for 2.0 hrs how much work is done?
b)a winch thats powered by a 156W motor lifts crate 9.8m in 11 seconds. what is the mass of the create?
Solutions
Expert Solution
a) work is form of energy as,
W = P*t
where W is work done, P is power and t is time.
W = 75 * 2* 60 *60
W = 5.4 * 10^5 J
b) as power is the work done per unit of time,
P = W/t
work is a type of energy and the object at a certain height have potential energy.
P = m*g*h/t
where m is the mass of crate, g is accelaration due to gravity and h is the height
using the known values,
156 = m*9.8*9.8/11
solving for m,
m = 17.86 kg
genius_generous answered 3 years agoRelated Solutions
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