What hits the atmosphere faster than 90,000 miles per hour

a.) comets

b.) meteors

c.) meteoroids

When an astronaut in orbit experiences apparent weightlessness, a. no forces act on the astronaut. b. no gravitational forces act on the astronaut. c. the net gravitational force on the astronaut is zero. d.

a skydiver jumps out of a plane. describe how gravitational potential energy changes as the skydiver falls. describe how the skydivers kinetic energy changes when the parachute opens

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax2 about the y-axis.

A hot air balloon uses the principle of buoyancy to create lift. By making the air inside the balloon less dense then the surrounding air, the balloon is able to lift objects many times its own weight.

All organisms in Kingdom Animalia are multicellular, meaning their bodies are composed of more than one cell. Which other characteristic is common to organisms in this kingdom? A. All have a backbone. B. All are able to survive in water. C.

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.

Why does each mineral have their own property, different from every other mineral?

Earth's tallest mountain ranges are found at plate boundaries

Is a lung a living organism, why or why not?