215 cm3 solid has a mass of 0.0189 kg. When calculating its density what is the appropriate number of significant figures

Which instrument is used to measure air temperature

If the new moon happens on january 15th, what shape will it be on february 6th?

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)