Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?

A.
Move the machine to a different gravitational field.
B.
Increase the friction between its moving parts.
C.
Reduce the friction between its moving parts.
D.
Redefine the machine’s system boundaries.

Which of the following is an example of units for speed

Calculate the velocity of a car traveling in a straight path due east with a distance of 16 meters in 2 seconds. question 1 options: a)32 m/s b)32 m/s e c) 8 m/s e d) 8 m/s

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?