I think its likely to explode
She does work from the moment she touches the book until she lets it go. Work is anything that requires energy. Therefore, she is working as she picks up the book, carries it, and when she is lifting it onto the shelf.
Answer: a) 0.04kW = 40W
b) 0.05
Explanation:
A)
Thermal efficiency of the power cycle = Input / output
Input = 10 kW + 14,400 kJ/min = 10 kW + 14,400 kJ/(60s) = 10 kW + 14,400/60 kW.
Output = 10 kW
Thermal Efficiency = Output / Input = 10kW / 250kW = 0.04KW = 40W
B)
Maximum Thermal Efficiency of the power cycle = 1 - T1/T2
Where T1 = 285kelvin
And T2 = 300kelvin
Maximum Thermal Efficiency = 1 - T1/T2 = 1 - 285/300 = 0.05
The total energy of the system remains the same.
2 m/s² is the acceleration.
<u>Explanation:</u>
Acceleration is defined as the rate of change in velocity with respect to time.
Here the initial velocity, u = 4 m/s
the final velocity , v = 12 m/s
time = 4 seconds
Acceleration =
Plug in the values, we will get,
Acceleration =
= = 2 m/s²