if a distant star is 20 light years away how long wil it take us to travel there moving at the speed of light?

Try at home mini-experiment. You will need 3 glasses-same size and shape. Fill one half-way with water, another almost full to the brim, and the other ¼ full with water. Order the glasses from least to greatest. Gently tap one glass with a spoon.

Which is an example of something heated by conduction? food heated in a microwave oven a waffle iron heated by coils pavement heated by the sun a room heated by moving air

Describe the difference between a field force and a contact force.

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work Fd) 0.5 m 2 m 250 m 750 m

One horsepower is a unit of power equal to 746W. How much energy can a 150-horsepower engine transform in 10.0 seconds?

The liquid contained in batteries that conducts electric charge is called the: solution, electrolyte, suspension, colloid

Someone jumped from a high altitude at 31,000m above the earth. he freefalled for 4 min and 36 secs with top speed of 988 mph

What does the law of reflection mean?

Compared with the peak wavelength given off by the sun, what is the peak wavelength given off by a hotter star? A.) shorter in wavelength and higher in energy B.) shorter in wavelength and lower in energy C.

4. Explain the doppler effect. Be sure to talk about how the wave changes, the perceived change hear by a person that an emitted sound is moving towards, and the perceived change hear by a person that an emitted sound is moving away from. 5.