What times are the moon phases visible? My science teacher said that the phases of the moon are only visible at sertant times of the day. Did i hear him right?

Who descover gravity and when?

Which process makes a river become curvier? A. deposition B. weathering C. lithification D. erosion

An electric toy with a resistance of 2.50 Ω is operated by a 3.00-V battery. (a) What current does the toy draw? (b) Assuming that the battery delivers a steady current for its lifetime of 4.

A rock climber uses a pulley system to pull himself 10 m up a tricky part of a rock face. If the pulley system has a mechanical advantage of 3 and the climber weighs 786 N, what force does he use?

How does the bohr model represent electrons around the central nucleus why think of the spectra?

What are factors that would change the position of the wave lengths measured? (There are more than one answer.) a) size of the tube b) tuning fork frequency c) distance between the tuning fork and tube d) room temperature e) area of the tube

This particle is found in the nucleus and adds mass to the nucleus, but changing its number does not change what the element is. This particle is the A. proton. B. photon. C. neutron. D. electron.

Projectile motion is an example of what kind of motion

What can change scientific knowledge?

6. What is ductility?