What must a magnet always have?

A. Two like poles

B. Two opposite charges

C. Two like charges

D. Two opposite poles

Newton's first law describes the tendency calles

Iron has a density of 7.9 g/cm3. How much mass is in a 10 cm3 sample of iron?

Explain the law of conservation of mass. When wood burns, it releases heat and turns into ashes. When the ashes are weighed, they are significantly lower than that of the wood. How is this possible in terms of the law of conservation of mass?

What is a lunar month and a lunar day?

What are some technologies used by designers of prosthetic legs to improve their designs?

A copper rod is 0.450 m long. Heat is added to the rod until it expands by 0.00130 m. How much did the temperature change? (Unit=C)

What often happens to light when it travels from one medium to another

60,000 is 100 time as much as

A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3.

Which of the following atoms do not usually form bonds