A cinder block is sitting on a platform 20 m high. it weighs 7.9 the block has potential energy. calculate it.

A geologist is comparing the properties of different minerals. He rubs each one on a piece of white tile and observes the color of he power that is left behind. What type of test did he perform? color hardness luster streak

A radioactive isotope has a half-life of ten days. how much of a 100 gram sample will be left after 20 days

What is the range of sound frequency for human and what does it mean for sounds lower or higher than the range

A chronic, no nprogressive condition of pain in the muscles, tendons, and ligaments is

How are constellations an important part of history, and what were they used for?

In which galaxy is our solar system located? a. milky way b. ngc 4414 c. andromeda d. small magellanic cloud

Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m

A person suffering from anaemia gets tired

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

Describe how electricity flows through a simple closed circuit.