Do penguins have knees and what shape is the sky?

Maria determines that the wavelength of a sound wave is 2.50 meters and that the wave is traveling at 340 m/s. What is the frequency of the sound wave?

A subatomic particle with a negative charge

At which boundary does subduction stop occurring, resulting in a mountain range?

Sound travels at a speed of about 344 m/s in air. You see a distant flash of lighting and hear the thunder arrive 7.6 seconds later. How many miles away was the lighting strike? (assume the light takes essentially no time to reach you.

Which one of the following is not a balanced equation? A. 2Ca (s) + O2 (g) → 2CaO (s) B. Ca (s) + O2 (g) → CaO (s) C. 2Li (s) + 2H2O (l) → 2LiH (aq) + H2 (g) D. CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)

Juan is interested in finding out whether hummingbirds are attracted to some flowers more than others. In what order should Juan perform the steps of his experiment?

Will make Brainlest! <3 Metals are considered to be good conductors of heat. How do the specific heat values indicate this?

Which example identifies a change in motion that produces acceleration? choices are: 1. a speed skater moving at a constant speed on a straight track 2. a ball moving at a constant speed around a circular track 3.

Which of the following diagnostic procedures uses ultrasound?

Why is it easier to read black text on a white background than to read green text of any light color?