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

I'm desperate 20 pts.

Which of the following is most appropriate to follow motion in one dimension?

Through which of the following ways can heat be transferred?

Tire inflation is very important to the safe and economical operation of any vehicle. Technician A says that the tire pressure should never exceed the maximum pressure imprinted on the sidewall of the tire.

The amount of force needed to keep a 0.5 kg football moving at a constant speed of 8 m/s on frictionless ice is

Which machine has an IMA less than 1 A: rake B: a crowbar C: a bottle opener D: a shovel

One of the main reasons steel is used more widely than iron is because it's lighter softer stronger than iron

What is the frequency of a wave with a velocity of 21.2 m/s and a wavelength of 8.3m?

Positive ions have blank protons than electrons

What is the weight, in n, of an object with a mass of 200 kg at a location where g = 9.6 m/s2. round the final answer to the nearest whole number?

A 1.7 kg book is lying on a 0.77 m - high table. You pick it up and place it on a bookshelf 2.0 m above the floor. how much work does gravity do on the book?