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

I'm desperate 20 pts.

Does the thickness of the wire affect the strength of an electroscope

Is the star with the longest total lifetime Also the farthest from earth? Explain.

Consider a sealed can that is filled with refrigerant-134a at 20 degrees C. Now a leak develops, and the pressure in the can drops to the local atmospheric pressure of 80 kPa.

Explain how chemical reactions involve energy

How much time does it take for tweety's bird cage to hit the ground after it was dropped if it reached a velocity of 22 meters per second right before impact?

If you lift a five pound object 18 inches how many joules of energy did yo use?

A temperature of 20°C is equal to °F.

Technician A says that when a fuse has popped, it just needs to be replaced, since it performed its job. Technician B says that when a fuse has blown, the circuit needs to be diagnosed because the fuse was probably not the problem. Who is correct? A.

A car starts from rest and moves around a circular track of radius 37.0 m. Its speed increases at the constant rate of 0.440 m/s2. (a) What is the magnitude of its net linear acceleration 18.

A dog walks Along the ground. If the dog applies an action force on the ground, what is the reaction force?