The difference between the Carbon 12 and Carbon 14 isotopes is the

atomic numbers

number of protons

number of neutrons.

number of electrons.

The tortoise and the hare are having a race. Both start at rest and have the same constant acceleration, but the hare maintains this acceleration for twice as much time as the tortoise before reaching her top speed.

When fossil fuels, such as gasoline, are burned, they create smoke. Smoke is best described as a heterogeneous mixture of solid particles from the burning fuel dispersed in a gas - usually air.

Sully uses a battery and a coil of wire to create an electromagnet. Using the same materials, if he wants to increase the strength of his electromagnet, he must the number of loops in the coil of wire along its length.

An element's atomic number is 54. how many protons would an atom of this element have

A hot air balloon contains 85,000 moles of air. To what temperature must the air be heated to fill a volume of 2500 m at a pressure of 100 kPa? A. 260K B. 2900 K C. 350 K D. 0.35 K

Voltage can exist without A. current. B. resistance. C. a closed circuit. D. all of these

During a football game, a receiver has just caught a pass and is standing still. Before he can move, a tackler, running at a velocity of 2.60 m/s, grabs and holds onto him so that they move off together with a velocity of 1.30 m/s.

What effect does an increase in temperature have on viscosity?

Aman tosses a jart upward with a velocity of 14.1 m/s a 60° angle

Describe accuracy, precision and best fit line.