Molecular Physics | Thermodynamics Answers

estimate the number of molecules in 1.00m^3 of air by assuming that it has a density of 1.21kg/m^3 and that is entirely composed of nitrogen molecules

In the compression stroke of an internal combustion engine the heat rejected to

the cooling water is 45 KJ/Kg and the work input is 90 KJ/Kg. Calculate the

Change in internal energy of the working fluid stating whether it is a gain or

loss

A car is driving at 25 m/s and sees a red light. The car comes to stop over a distance of 100 m. What is their acceleration? Time?

A ball is thrown down a building with an initial velocity of -5 m/s. It takes 6 seconds to reach the ground. How high is the building? What is the velocity when it hits the ground?

You are standing on the North bank of a river which has a current moving 0.2 m/s [E], if you can swim 1.0 m/s, in what direction (to the nearest degree) should you swim in order to reach the South bank of the river at the point exactly opposite from you?

Resolve the following vectors into their components:

a)7.5m/s2 [NW] b)15m/s[25*WofS]

 Calculate the quantity of heat absorbed by 3 kg of copper when heated from room temperature to 70oC. (ccu= 0.092 cal/groC)

What will be the change of temperature for 300 gr of iron (Fe) which have gained 2000 cal? (cFe= 0.11 cal/groC)

In problem R=√R²×+R²y=√(3.0km)²+(1.0km)²

R=2.24km, in what direction she from the starting point?

a set of forces are acting on an object. The first force, with a magnitude of 24.70N, is directed at -258 degrees and the second force, with a magnitude of 53.20B, is directed at 37 degrees north of east. The third force with a magnitude of 166.50N is directed at 270, and the fourth force of 49.92N is directed at 50 degrees east of south. Solve the resultant force and exact direction analytically.