The mass of a star can be determined by studying
a. the wavelength of light emitted by the star.
b. the color of the star.
c. kepler's laws.
d. binary star systems.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology

Me with this and you will be marked brainliest