The answer is 86 degrees Fahrenheit. Formula is (30 x 9.5) + 32 = 86
Answer:
Explanation:
Let T be the temperature of an object at time t , then
dT / dt will be rate of change of temperature
According to newton's law of cooling
dT / dt = k ( T - T₂ )
where T₂ is temperature of surrounding , T is temperature of object , k is a constant .
dT / dt = k ( T - T₂ )
Given k = .4 , ambient temperature T₂ = 68⁰C
dT / dt = .4 ( T - 68 )
dT / ( T - 68 ) = .4 dt .
This is required differential equation .
Answer:
13.15 watt
Explanation:
work done = Force x displacement
W = 25.3 x 1.3
W= 32.89 J
Power = Work done / time
Power = 32.89 / 2.5
Power = 13.15 Watt