How do scientist learn about stars and galaxies even tough humans have never been there?

A bird flies north with a constant velocity of 4 m/s. What does the graph of the bird's acceleration versus time look like?

Why sheets of newspaper can be used to keep ice cream cold and keep fish and chips hot?

Three forces in the x-y plane act on a 6.80 kg mass: 10.10 N directed at 19o, 8.60 N directed at 122o, and 9.80 N directed at 218o. All angles are measured from the positive x-axis, with positive angles in the Counter-Clockwise direction.

All of the following are effects of rain forest destruction except

One heater uses 310 W of power when connected by itself to a battery. Another heater uses 180 W of power when connected by itself to the same battery. How much total power do the heaters use when they are both connected in series across the battery?

If a recipe says to bake a pizza in 250 degrees Celsius at what temperature should you set your temperature that uses Fahrenheit scale

A German scientist, George Ohm, discovered the relationship between current, voltage, and resistance. This became known as Ohm's law.

The amount of fluid displaced by a submerged object depends on its

What kinds of space and matter can light travel through?

A capacitor is connected to a power source and begins charging. What causes the capacitor to stop charging while it is still connected to the power source?