If scientist sent light waves to four different objects in space, which would take the longest to bounce the wave back to earth

If you were to take a radio to the moon, which of the following would correctly describe the changes to its mass and weight?

What does the earths core do

A scientist is studying a shock wave from an earthquake. What kind of wave is being studied? an electromagnetic wave a gamma ray a radio wave a mechanical wave

What causes a material to be classified as ferromagnetic?

Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell occurs when

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?

Suppose that Paul D. Trigger fires a bullet from a gun. Will the speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun? Explain.

A certain rock contains large jagged pieces of other rocks cemented by fine particles what type of rock is this explain