PHYSICS HIGH SCHOOL

The atomic mass of an element is A. twice the number of protons in one atom of the element. B. the sum of the protons and neutrons in one atom of the element. C. a weighted average of the masses of an element’s isotopes. D. a ratio based on the mass of a carbon-12 atom.

Answers

Answer 1
Answer: b. the sum of the protons and the neutrons in one atom of the element
Answer 2
Answer:

Answer:

the answer is b

Explanation:

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Which of the following areas would most likely have the deepest layer of topsoil?
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If an athlete expends 3480. kJ/h, how long does she have to play to work off 1.00 lb of body fat? Note that the nutritional calorie (Calorie) is equivalent to 1 kcal, and one pound of body fat is equivalent to about 4.10 × 103 Calories.

Explain why dogs pant during hot summer days using the concept of evaporation?

Answers

Dogs pant because they can't sweet out their heat so they pant it out (and drink water) to cool themselves down.

As you travel up into the mountains, you notice discomfort in your ears. This is due to ...A. the low pressure in your ears.
B. the low pressure at the bottom.
C. the low pressure in the mountain.
D. the high pressure in the mountains.

Answers

Answer: The correct answer is the low pressure in the mountains

Explanation:  

The air pressure is lower in the mountains. As we travel up into the mountains, the air inside our ears takes some time to adjust the pressure change.

This unequal pressure causes discomfort in ears while ascending and descending on the mountain. The condition of discomfort in ear is caused by the pressure difference between the outside and inside the eardrum.

Therefore, as we travel up to into the mountains, we notice discomfort in our ears. This is due to the low pressure in the mountain.
C.) The low pressure in the mountains

The current in the circuit shown is 2.0 A.What is the value of R3?

A) 10 Ω
B) 15 Ω
C) 20 Ω
D) 55 Ω

Answers

Answer:

Resistor R₃ = 10 Ω

Explanation:

It is given that,

Current flowing in the circuit, I = 2 A

Resistors R₁ = 2 Ω

Resistor R₂ = 3 Ω

Voltage, V = 30 V

We have to find the value of R₃. All three resistors are connected in series. In series combination, the current flowing through the all resistors is same. Firstly, calculating equivalent resistance of three resistors as :

R_(eq)=R_1+R_2+R_3

R_(eq)=2\ \Omega+3\ \Omega+R_3    

R_(eq)=5\ \Omega+R_3..............(1)

Using Ohm's law :V=IR_(eq)

30\ V=2\ A* (5 + R_(3))

On solving above equation : R_3=10\ \Omega

Hence, the correct option is (A) " 10 Ω "                                            

The value of R3 is A) 10 Ω

The big bang produced an imprint of leftover heat called

Answers

Answer:

Cosmic Microwave Background

Explanation:

The cosmic background radiation gives us a glimpse into the formative years of our universe. The cosmic background radiation contains radiation from the epoch of recombination of the Big Bang. The radiation is most visible in the microwave region of the electromagnetic spectrum. The radiation poses a strong case that the universe originated from the big bang.
That's called the "Cosmic Microwave Background".  (CMB)
It was discovered in 1965, and its discoverers were awarded
the Nobel Prize in Physics in 1978.

How do different cells in your body help you survive?

Answers

Different cells in our bodies perform different functions,hense they work together to make sure that the body functions well

A person throws a tennis ball 6 m/s straight up. How long does it take for it to come back to their hand?

Answers

Answer

1.2245 s


Explanation

Using the Newton's law of linear motion,

v = u + gt


where v ⇒ Final velocity

            u ⇒ initial velocity,

             t ⇒ time to reach maximum height.

             g ⇒ acceleration due to gravity.

v = u + at

v = 0 m/s

g = -9.8 m/s²  (negative because the velocity is decreasing)

0 = 6 + -9.8t

9.8t = 6

t = 0.612244898 s

This is the time to reach maximum height. It will take the same time to come back to the hand.

so total time = 0.612244898 × 2

                      = 1.2245 s
Best Answer: BY v = u -gt=>0 = 6 - 9.8 x t=>t = 0.61 secThus time it take to come back to hand (T) = 2t = 1.22 secLol I hope this helps because I had funning helping you XD
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