There is no air in space astronauts in space cannot hear sounds from outside their spacesuits explain this

You use an inclined plane to move furniture into a truck. You perform 105 kJ of work, but only do 88 kJ of useful work. What is the efficiency of the inclined plane?

A crate is to be pulled across the floor. The crate will experience a force of friction of 34 N. You pull on the crate with a force of 75 N. The mass of the crate is 8.5 kg.

Who was the first person to observe the moon through a telescope

Infrared radiation causes phosphors to give off visible light?

In theory, what would be the approximate weight gain of a person who consumes an excess of 500 kcal every day for four weeks (e. g., about 28 days) ? A) 0.5 lbs B) 2 lbs C) 3 lbs D) 4 lbs

Which of these is the best reason for proper nutrition? A. To ensure that you will be skinny B. To protect yourself against certain diseases C. To improve your intelligence D. To ensure that you will get good grades

And object has a mass of 15g it has a volume of 7.5ml. find the density of the object.

I need this answered quickly. is the branch of science for naming and classifying organisms based on their natural relationships? A-physics B-taxonomy C-genetics D-biology

For a fixed amount of gas, if the absolute temperature of the gas is doubled, what happens to the pressure of the gas?

A 500-kilogram sports car accelerates uni- formly from rest, reaching a speed of 30 me- ters per second in 6 seconds. What distance has the car traveled during the 6 seconds?