Author Question: A sample of helium (He) occupies 44.8 L at STP. What is the mass of the sample? A) 2 g B) ... (Read 391 times)

dollx · **on:** Jul 29, 2018

A sample of helium (He) occupies 44.8 L at STP. What is the mass of the sample?

A)

2 g

B)

4 g

C)

6 g

D)

8 g

E)

10 g

Question 2

Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A)

It was always zero.

B)

It was never zero.
C)

It was not zero, but ended up zero.

D)

none of the above