What are four uses of radioactive isotopes?

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?

During a total lunar eclipse, the Earth, Sun, and Moon are arranged in a line, and the Moon is completely dark. In what order do the Earth, Sun, and Moon line up?

Push or pull of one object to another

A star has a surface temperature of 30,000 K. At what wavelength does the peak radiation occur? 100 nm 97 nm 87 nm 0.01 nm

Water has a very high specific heat, Why does this make it a very good substance for use in cooling systems of automobiles?

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?