A train travels 225 km in 2.5 hours. What is the trains average speed

True or false organisms that are capable of photosynthesis are called consumers

One astronomer has observed an apparent lengthening of the electromagnetic waves given off by a star. Which of these conclusions is correct about the star? Its parallax is increasing. It is moving towards Earth. Its wavelength is decreasing.

Facts about unstable atoms

Hydrogen gas was cooled from 150c to 50c. its volume is 75.0 ml. what was its original volume?

The gravitational force extend by a large, object, such as Earth is

If you have two different sized velocity vectors representing two objects moving in the same direction, then what can you conclude?

The identity of an element depends on the number of 1. protons in the atom. 2. electrons in the atom. 3. neutrons in the atom. 4. protons and neutrons in the nucleus.

Why do the positions of stars change in the universe?

If a glacier is in equilibrium, where ablation is equal to the accumulation, what occurs in the terminus or 'snout'

When the nanocrystalline semiconductor samples provided in case study are irradiated with violet light, you should observe that different samples emit different colors of light.