If the lights are off in a room and there are no windows, why do most objects appear black?

After three half-lives, what fraction of a radioactive sample has decayed 5/6 1/2 7/8 2/3

Which of the following is true about short circuits? A. Occurs when a very low resistance circuit is formed B. Occurs when a very high resistance circuit is formed C. Causes a very small current to form D. Cannot cause a fire

Will protons (with positive charge) tend to go to a region of high potential o of low potential?

Similarities between rotating earth and non rotating earth

if the kinetic and potential energy in a system or equal to the potential energy increases what happens as a result

Which method would you use to find the volume of an irregular shaped object?

A step up transformer has a primary coil with 100 turns and a secondary coil with 25 turns if the input voltage in the primary coil is 40 volts what is the output voltage reduced to in the secondary coil A) 20 volts B) 35 volts C) 4 volts D) 10

An instrument used to measure atmospheric pressure is called a

A 200-kg boulder is 1000-m above the ground. what is its potential energy?

The law of reflection states that if the angle of incidence is 81 degrees, the angle of reflection is ___ degrees.