Suppose Galileo dropped a lead ball (100 kilograms) and a glass ball (1 kilogram) from the Leaning Tower of Pisa. Which one hit the ground first?

Which element makes up earth's atmosphere? a. hydrogen b. carbon c. oxygen d. nitrogen

Who was the first people to suggest that matter is mad up of particles that cannot be divided

8. What is the wavelength of a sound wave that has a speed of 250 m/s and a frequency of 400 Hz? 9. What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 2.0 m? 10.

The light bulbs in most homes are all rated for 120 V, no matter how many bulbs there are. How is the ability to use any number of same voltage bulbs affected by the way in which the bulbs are wired (series or parallel)

Which, if any, of the three types of galaxies occur the most often?

What energy do electrons have when they are farther away from the nucleus?

200 525000 lololo Boat A is 10 km north of a port. Boat B is 5 km east of the same port. Boat A sails in a straight line towards boat B. Work out the bearing on which boat A sails.

Is Li greater than He on the periodic table?

White light falls on a yellow filter, if: (a) A green filter is placed behind a yellow filter, what is the colour of the light that will emerge from the green filter?

Calculate the energy equivalent in joules of the mass of a proton. [Show all work, including the equation and substitution with units.]