What is the best alternative explanation for the dark matter in the milky way based on the observed orbital motions of stars and gas?

Why is saturn's atmosphere almost three times thicker than jupiter's?

Air in a cylinder is compressed to one-tenth of its original volume without change in temperature. What happens to its pressure? Imagine now that a valve is opened in order to restore the initial pressure value.

A person begins to run at a velocity of 13 mph. This takes the person 10 minutes. What is the acceleration of the person for 10 minutes?

The anion formed from an oxygen atom is called a

Based on the fluid mosaic model of the cell membrane, which type of molecule can move passively across the membrane, without the aid of proteins? A. charged molecules B. large polar molecules C. macromolecules D. nonpolar molecules

If the force applied to an object increases while the mass stays the same, the acceleration of the object.

Planetary nebulae are characterized by an emission spectrum consisting of Balmer (hydrogen) emission lines and a pair of strong emission lines at 4959˚A and 5007˚A that were quite mysterious when first seen.

What is the mass of oxygen in an oxygen tank at 20 C if the tank has a volume of 0.20 m3 and the oxygen pressure in the tank is 4.0 105 N/m2 (mass of one mole of one mole of oxygen is 16 g and the universal gas constant is 8.

What is one advantage infrared astronomy has over visible light astronomy?

A 60-kg runner raises his center of mass approximately 0.5 m with each step. Although his leg muscles act as a spring, recapturing the energy each time his feet touch down, there's an average 10% loss with each compression.