1. Mendeleev arranged the known chemical elements in a table according to

increasing

a. Atomic number

c. number of protons

b. Number of electrons

d. atomic mass

A truck going 15 km/h has a head-on collision with a small car going 30 km/h. Which statement best describes the situation? a. The truck has the greater change of momentum because it has the greater mass. b. None of the above is necessarily true. c.

If you precisely measure the position of a particle, you A. destroy its wave nature. B. cause it to diffract. C. destroy all information about its speed or momentum. D. cause the particle to be annihilated.

What is the period of a wave if 3 waves pass every 6 seconds? A. 0.5 s B. 2 s C. 3 s D. 6 s

Why is a magnet strongest at its poles?

Ingrid is jogging at 9 km/h, she tosses a relay stick at 16 km/h to her teammate. How fast is the relay stick moving relative to Ingrid?

When a sound wave first enters the auricle, which part of the ear does it travel through on its way to the eardrum? auditory nerve cochlea hammer ear canal

Isla made a diagram to compare X-rays and radio waves. A venn diagram with two intersecting circles. The one on the left is labeled x-rays and the one on the right is labeled radio waves.

What is the magnitude of electrostatic force of attraction between two alpha particles separated at a distance 5.3x10-11m? (1 apha particle = change of proton)

A block of material of volume 20cm³ and density of 2.5gcm³suspended from a spring balance with half of the volume of the block immersed in water. What is the reading of the spring balance?

What are changes in temperature, duration of daylight, and the presence of a predator all examples of? a. Behavior c. Stimuli b. Reflex d. Instinct