A hot 1000 g chunk of copper is allowed to cool to 100°C. If the copper gave off 231 kJ of energy, what was the initial temperature of the copper? The specific
heat of copper is 0.385 J/gºC. *

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

Based on the diagram of the electric field lines around the two spherical charges, what are the signs of the left and right charge respectively?

Unpolarized light passes through three polarizing filters. the first one is oriented with a horizontal transmission axis, the second filter has its transmission axis 25.7° from the horizontal, and the third one has a vertical transmission axis. what percent of the light gets through this combination of filters