11. How many elements are in the second period, or row, of the periodic table

a. 1

b. 2

C. 8

d. 18

While exploring a castle, Exena the Exterminator is spotted by a dragon who chases her down a hallway. Exena runs into a room and attempts to swing the heavy door shut before the dragon gets her.

A child goes down a slide with an initial height of 4m. What is his speed at the bottom of the slide? There is no other information given.

How did the swimmer in the video prepare for the energy demands he was about to place on his body?

A 12000 kg boat is moving 4.25 m/s. Its engine pushes 9200 N forward, but the current pushes back at 12,500 N. How much times does it take the boat to stop?

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 241 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.

Which is a tool used by scientists to determine the composition of objects? a hologram a spectrometer a wave front a prism

If the Sun were scaled down to the size of a grapefruit, about how far would you have to walk from our classroom to reach Alpha Centauri, the closest star?

What happens to the density of the mass decreases but the volume remains the same?

An interstate highway loop meets the primary route at both ends. the first digit of its route number is always

What is the impulse on a car (750 kg) that accelerates from rest to 5.0 m/s in 10 seconds