Why do helium balloons float? Talk about density of atoms and compare to elements in the air.

It's mid-afternoon on a lovely, sunny day; it's 60°F, and the sun is 60° above the horizon. Rays from the sun strike the still surface of a shallow pond that is 20 cm deep.

Any fine girls out there

Two asteroids of equal mass in the asteroid belt between mars and jupiter collide with a glancing blow. asteroid a, which was initially traveling at va1 = 40.0 m/s with respect to an inertial frame in which asteroid b was at rest, is deflected 30.

If the period of the oscillator were doubled, what would happen to the wavelength and wave speed?

Dust reddens starlight because it a. emits mostly in the infrared due to its cold temperature. b. re-emits the light it absorbs at red wavelengths. c. preferentially affects light at visible and shorter wavelengths. d.

A Chinook salmon can swim underwater at 3.75 m/s, and it can also jump vertically upward, leaving the water with a speed of 6.20 m/s. A record salmon has length 1.50 m and mass 61.0 kg.

Ursula is a student of Kantian philosophy who argues that we should never use people as a means to an end unless

How does natural gas furnes effect the enviroment

Which of the following is NOT a type of galaxy? a. spiralc. elliptical b. ovald. irregular

Why are galaxies visible