A 10 g gold coin that was 70 C was placed into 20 grams of water. After
sitting for quite a while, the gold coin reached a temperature of 40 C. At
what temperature did the water start at before the coin was added?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?