Which of the following is an example of an indirect observation?
a. measuring the temperature of a liquid with a thermometer
b. detecting a planet by observing the motion of its parent star
c. discovering where butterflies come from by watching a caterpillar change into a butterfly
d. measuring the disappearance of a chemical in a chemical reaction by watching a color change

What happens to the light rays when they hit the specimen?

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.