Rainbow cannot be seen at midday even in the rain why?

A sample of plutonium-239 decays to one-eighth of its original amount after 7.236 x 104 years. What is its half-life?

Which is heavier? A. 1 kilogram of steel B. 1 kilogram of feathers C. 1 kilogram of paper D. 1 kilogram of rocks E. 1 kilogram of anything else

Arthur reads an article describing an experiment to test the effects of caffeine on the reaction time of humans-how long it took them to respond to a particular signal.

Why would an insurance company want people to avoid risk, like Nick Cannon having to avoid skydiving?

Ultraviolet waves can; A - enable your body to produce vitamin D B - cause cancers C - cause skin damage D - all of the above

Whay is moon non-lominous body

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.

Cho is using technological design to build a clock based on the apparent motion of the Sun. Which of the following would be the best measure of success for Cho's clock? A. Cho's clock works even at night. B.

Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. a) The car is decelerating and its acceleration is positive.

What are the moons of the outer planets made of, and how is their composition different from that of our Moon?