Need
the first law of thermodynamics states that . is this also a statement of the principle of conservation of energy?
yes, the heat added and the change in internal energy of the gas equal the work done by the piston.
yes, the heat that flows into the system is used to change the internal energy of the gas and becomes work done by the piston.
no, the heat that is added to the system is only used to do work.
no, the change in internal energy is the energy lost in the system.

What is magnetic flux? explain faraday's law of induction.

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c