Which units are used to measure both velocity and speed? Select three options.
m/s
dt
km/h
mph
Iph

What is hidden during a lunar eclipse? isn't the moon hidden?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.