An atom has 14 protons and 15 neutrons, what is its mass number?

I'm desperate 20 pts.

How is it possible for white dwarfs to have a lower luminosity than the sun is much cooler than the white dwarfs

Five students measured the same kind with the ruler shown below the results reported by the students were as follows 4.51 cm, 4.55cm, 4.5cm and 4.

What accounts for an increase in the temperature of a gas

A temperature of 50°F is equal t °C. What is the number in between t and c

True or false? In general, the physical properties of nonmetals are similar to the properties of metals.

Imagine you transfer heat into a gas. This heat splits up in two different ways: Additional thermal energy making the gas hotter and "fuel" for the gas to do work. Let's suppose, 64% of the transferred heat transforms into thermal energy.

How much heat is absorbed by a 61g iron skillet when its temperature rises from 5oC to 29oC?

Explain the relationship between motion and frame of reference.

Two students are looking at a brightly lit full Moon, illuminated by the reflected light from the Sun. Consider thefollowing discussion between the two students about what the spectrum of moonlight would look like.

When performing a battery load test, what should the load be set to?