torque wrench recommendations
can you help me in physics?
According to the manual of a certain car, a maximum torque of magnitude 56.0 N · m should be applied when tightening the lug nuts on the vehicle. If you use a wrench of length 0.362 m and you apply the force at the end of the wrench at an angle of 75.00° with respect to a line going from the lug nut through the end of the handle, what is the magnitude of the maximum force you can exert on the handle without exceeding the recommendation?
____ N
Lake Erie contains roughly 4.00 multiplied by 1011 m3 of water.
(a) How much energy is required to raise the temperature of that volume of water from 9.0°C to 11.0°C?
__J
(b) How many years would it take to supply this amount of energy by using the 1200-MW exhaust energy of an electric power plant?
___ yr
A 85-g sample of silicon is at 20°C. If 650 cal of energy is transferred to the silicon, what is its final temperature?
____°C
56 = 0.362 . F cos 15˚
F = 160 N
Energy needed = Mass . specific heat . Temperature rise
E = 4 . 10^14 . 4.2 , 10^3 . 2 = 3.36 . 10^18 J
1.2 . 10^9 Joules per second = 3.78 . 10^16 J / year
It will take 88.89 = 88.9 years
What is the specific heat of Silicon? I have no idea.