Astronomers believe that cosmic background radiation formed:

a. about 1 billion years ago.

b. about 1 million years ago.

c. shortly after the big bang.

d. about 100,000 years ago.

If a person weighs 890 newtons, roughly what is the mass of the person?

If the mass of a material is 104 grams and the volume of the material is 16 cm3, what would the density of the material be?

Which two factors does the power of a machine depend on

What is responsible for the apparent motion of the Moon in the sky from East to West?

The horizontal surface on which the 2.0 - kg block slides is frictionless. The speed of the block before it touches the spring is 9.0 m/s. How fast is the block moving at the instant the spring has been compressed 174.5 mm

Gravity decreases with distance. Which statement is also true? Orbital speed increases with distance. Orbital speed decreases with distance. Orbital speed remains constant with distance. Orbital speed varies based on the functions of friction.

Suppose the time taken for light to bounce to and fro between the parallel mirrors of a light clock is 1 second, in the frame of reference of the light clock.

Why does the modern model use an electron cloud?

The engineering quadrangle is approximately 235 meters above sea level. If the temperature is 15 degrees Celsius, is that above, below, or equal to the standard temperature for this altitude?

The most serious effect of radiation on humans is A. it causes us to melt B. the damage it can cause to our DNA C. there are no serious effects of radiation on humans D. the damage it can cause to our ski