What happens to the composition of an atom to cause it to become positively or negatively charged?

The ceiling of an arena is 79 m above the floor. What is the minimum speed that a thrown ball would need to just reach the ceiling? m/s

What is the relationship between the distance on a map and the actual distance on earth called?

How many grams of 2Na+Cl2 would it take to make 4 grams of table salt

9. A radioisotope has a half-life of 4.50 min and an initial decay rate of 8400 Bq. What will be the decay rate after 18.0 min?

A perfectly conductive plate is placed in the y z-plane. An electromagnetic wave with electric field is incident on the conductor.

Which of the following statements concerning Howard Gardner's multiple intelligences is not correct? A. Gardner is not interested in assessing levels of intelligence. B. Gardner has based his theory on research in various areas of psychology. C.

The force of attraction between two oppositely charged pith balls is 5.3 * 10-6 newtons. If the charge on the two objects is 6.7 * 10-9 coulombs, what is the distance between the two charges? (k = 9.0 * 109 newton·meter2/coulombs2)

To describe velocity you need to know?

Mohammed made a chart to list examples and nonexamples of projectile motion. Which best completes the chart? a - a football thrown in the airb - a kite flying on a stringc - a golf ball rolling off a table d - water spraying from a fountain

Halley's Comet appears around the sun about once every 76 years. It passes through the part of its orbit nearest the sun in just a few months but then moves out to great distances and takes more than half a century for the rest of its orbit.