Why is it that the properties of pure substance do not vary from sample to sample

How many joules of energy does a 100-watt light bulb use per hour?

A body travels 80 meters in 8 seconds at a steady speed calculate it's average speed

Tossed Salad is an example of?

A particle with a charge of 3.00 elementary charges moves through a potential difference of 4.50 volts. What is the change in electrical potential energy of the particle? (1) 1.07 * 10 19eV (2) 2.16 * 10 18eV (3) 1.50 eV (4) 13.5 eV

The science class built a robot that travels 5m north in 10s s. What is the robots average velocity

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?