The sun is composed mostly of hydrogen. The mass of the sun is 2.0 * 10^30 kg, and the mass of a hydrogen atom is 1.67 * 10^-27 kg. Estimate the number of atoms in the sun.

The acceleration of high-speed aircraft is sometimes expressed in g's (in multiples of the standard acceleration of gravity). Determine the upward force, in N, that a 78.03-kg person would experience in an aircraft whose acceleration is 5.05 g's.

Identify the correct order of increasing intermolecular force of attraction for the three most common states of matter. A) liquid - solid - gas B) Solid - liquid - gas C) gas - liquid - solid D) gas - solid - liquid

Is it possible to do work on an object without changing the kinetic energy of the object? Now Why? a) Yes, it is possible by raising the object to a greater height without acceleration.

When a passenger in train A looks at a passenger directly across in train B it appears that train B is not moving even though both trains are moving. How does the speed od train A compare to train B

A person fires a 38 gram bullet straight up into the air. It rises, then falls straight back down, striking the ground with a speed of 345 m/s. The bullet embeds itself into the ground a distance of 8.9 cm before coming to a stop.

In a classic carnival ride, patrons stand against the wall in a cylindrically shaped room. once the room gets spinning fast enough, the floor drops from the bottom of the room!

What does Newton's law of universal gravitation say about the distance between objects?

Direction of current in a solenoid depends on the direction of magnetic field

What is your mass in kilograms?

Why is it useful for pairs of DNA to be held together by men bonds and not covalent bonds?