Why is hydrogen a light gas whereas iron is a heavy solid

8. Humans need oxygen to break down food in order to provide energy for cells. The oxygen needed for this process is delivered by an organ system called the A. respiratory system. B. lungs. C. digestive system. D. alveolus.

You observe three carts moving to the left. Cart A moves to the left at nearly constant speed. Cart B moves to the left, gradually speeding up. Cart C moves to the left, gradually slowing down.

he adventurous robot M. A. N. D. I. is orbiting Saturn's moon Dione. She wants to cause an impact with themoon to kick up some of the surface dust so that she can do a spectral analysis of it.

How to find moment of inertia of a pulley?

Can light cause the rubber to become solid? Why or why not? Does it matter what type of light she shines on the rubber?

What is the frequency of a water wave that has a wavelength of 0.5 m and a speed of 4.0 m/s?

What are some examples of tools or objects that apply force?

You push a 45 kg wooden box across a wooden floor at a constant speed of 1.0 m/s. The coefficient of kinetic friction is 0.25. Now you double the force on the box. How long would it take for the velocity of the crate to double to 2.0 m/s

Why do you feel warm when you are standing away from a camp fire

A student in her physics lab measures the standing-wave modes of a tube. The lowest frequency that makes a resonance is 20 Hz. As the frequency is increased, the next resonance is at 60 Hz. What will be the next resonance after this? A. 80 Hz B.