How do scientist learn about stars and galaxies even tough humans have never been there?

Summarize the relationship between entropy and life?

If two uncharged objects are rubbed together and one of them acquires a negative charge, then the other a. one remains uncharged. b. also acquires a negative charge. c. acquires a positive charge. d.

How many electrons are in an electrically neutral atom of boron?

Noah stands 170 meters away from a steep canyon wall. He shouts and hears the echo of his voice one second later. What is the speed of the wave?

For a certain optical medium the speed of light varies from a low value of 1.80 * 10 8 m/s for violet light to a high value of 1.92 * 10 8 m/s for red light. Calculate the range of the index of refraction n of the material for visible light.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron

Which is an example of transfroming potential energy to kinetic