When a car burns gasoline, much of the energy is released in the form of heat. which of the following best describes this process in relation to the first law of thermodynamics?
a. energy is not created nor destroyed, but it can change into matter.
b. energy is not created nor destroyed, but it can change from one energy form to another.
c. energy can be created from matter or used to produce matter.
d. some useful energy is lost as heat whenever an energy transfer occurs.
e. energy transfers are always 100% efficient in changing energy from one useful form to another.

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47