Edwin Hubble categorized galaxies according to their

A. shapes.

B. colors.

C. food supplies.

D. inhabitants.

Between steps 3 and 4, the heat energy in the steam is converted to A. mechanical energy B. heat energy C. transitional energy D. electrical energy

Identify which phase of matter would transmit light waves the fastest, and why? A) The gas would transmit the fastest because the particles move the fastest. B) The solid would transmit the fastest because the particles are closest together.

Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 19 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 29 cm.

What is the best example of reusing

If the mass of the tritium nucleus is 3.02 universal mass units and the mass of the helium nucleus is 4.00 universal mass units, how much energy (in Megaelectronvolts) is absorbed as the tritium decays into helium?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

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