Why would heating the gas in an air balloon make the balloon rise?

Seeing how strong our gravitational pull is here on Earth, would it be possible to kill someone if you drop a penny off the Empire State building?

In an ecosystem, why can only one species fill an ecological niche?

Can the world run out of carbon? Explain why you answered the way you did

What is the difference between sound waves and water waves

You find a rock in which the grains are arrenged in wavy, parallel bands of white and black crystals. What kind of rock have you probably found?

Which is not support the theory of plate tectonics?

the acceleration of a body in free fall depends on the place or the world in which it is, true or false?

A square loop of wire consisting of a single turn is perpendicular to a uniform magnetic field. the square loop is then re-formed into a circular loop, which also consists of a single turn and is also perpendicular to the same magnetic field.

A thin cylindrical shell and a solid cylinder have the same mass and radius. The two are released side by side and roll down, without slipping, from the top of an inclined plane that is 1.8 m above the ground.

The water in a lake is at 5 °C. A diver measures the pressure of the water at two different depths in the lake. He repeats the measurements on a different day when the water is at 15°C.