PHYSICS HIGH SCHOOL

According to the periodic table, the average atomic mass of helium is A) 2 amu. B) 2.0026 amu. C) 4.0026 amu. D) 6.0026 amu.

Answers

Answer 1
Answer:

Answer:

C) 4.0026 amu

Explanation:

Helium (He) is the 2nd element on the Periodic Table.

It's neutral atom has 2 protons and 2 electrons.

It is in the 1st period and the 18th row.

It is also a Noble gas.

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The big bang produced an imprint of leftover heat called
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A rectangular plate has a length of (22.4 ± 0.2) cm and a width of (8.4 ± 0.1) cm. Calculate the area of the plate, including its uncertainty.

According to Levin, how can black holes be investigated?

Answers

By observing their effect on their surroundings.

If the pitch of a sound decreases and the sound source is moving, is the sound source moving toward or away from the observer

Answers

the sound source must be moving away

For which of these scenarios is total internal reflection possible?

Answers

TIR is possible whenever light is travelling from a more optically dense medium to a less optically dense medium. You didnt provide any scenarios but just look up refractive indexes of the mediums the light is travelling through and if it is travelling from a more dense to a less dense, TIR is possible

1. A player kicks a football from ground level with an initial velocity of 22m/s, 35° above the horizontal. Assume that air resistance is negligible. Find the ball’s hang time.a. Find the maximum height of the ball in question 2.

b. Find the ball’s range from question 2.

Answers

Answer:

2.57 s

8.12 m

46.4 m

Explanation:

1. In the y direction:

s = 0 m

u = 22 sin 35° m/s = 12.6 m/s

a = -9.8 m/s²

Find: t

s = ut + ½ at²

0 = (12.6) t + ½ (-9.8) t²

t = 2.57 s

2. In the y direction:

u = 12.6 m/s

v = 0 m/s

a = -9.8 m/s²

Find: s

v² = u² + 2as

0² = (12.6)² + 2 (-9.8) s

s = 8.12 m

3. In the x direction:

u = 22 cos 35° m/s = 18.0 m/s

a = 0 m/s²

t = 2.57 s

Find: s

s = ut + ½ at²

s = (18.0) (2.57) + ½ (0) (2.57)²

s = 46.4 m

As you move toward a warning siren, the pitch _____.increases
decreases
stays the same
disappears

Answers

Answer: Increases.

Explanation:

Warning siren is generally used to make people alert of danger. Danger can be anything associated with the health and hazard.

Warning siren can be due to tsunami, earthquake, fire, flood, et cetera. The pitch of siren is low when a person is afar from the siren.

As the person moves close to the siren, the pitch of siren increases.

Answer:

As you move toward the siren the pitch should get louder

Explanation:

Find two words in a vocabulary list that descirbe the bending of a wave

Answers

reflection and refraction 
refraction and reflection describe a wave
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