PHYSICS HIGH SCHOOL

If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the bodyA-17 m/s
B-19.5 m/s
C-28 m/s
D-21.5 m/s

Answers

Answer 1
Answer:

If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, the average velocity of the body is 21.5 m/s. the answer is letter D. Velocity is a vector quantity and average velocity can be defined as the sum of the initial and final velocity divided by 2 at constant acceleration.
Answer 2
Answer:

The Correct answer to this question for Penn Foster Students is: 21.5 m/s

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A tropical storm turns into a hurricane when wind speeds reach?

Answers

A tropical storm turns into a hurricane when wind speeds reach more than 33 knots. It happens when the tropical depression strengthens and then the speed of the wind starts increasing and reaches a stage when it is called a hurricane. Right type of condition can create a powerful hurricane, but when the right conditions are not there, then the storm fizzles out. 

Answer:

74mph

Explanation:

the internet

A single polarizer will stop _____ of the incoming light. less than 50% 50% more than 50% but less than 100% 100%

Answers

So we want to know how much light will a single polarizer stop. Since the polarizer intensity formula is I=I0cos^2(a), where I is the intensity, I0 is the initial intensity and a is the angle of the light's initial polarization direction and the axis of the polarizer. Also, the average of cos^2a is 1/2 so I=(1/12)*I0. and I/I0=1/2 or 50%. So the light that passes trough one polarizer has 50% of the initial intensity. And the correct answer is 50%.
The answer is 50%. Remember, it's a single polarizer, not two of them.

If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sound, based on the coefficient of absorption for each material?        A. Heavy curtains   B. Wood   C. Concrete   D. Carpet

Answers

The material that would absorb the most sound is Heavy curtains (Option A)

What material absorbs the most sound?

The effectiveness of a material in absorbing sound is typically measured by its coefficient of absorption.

The coefficient of absorption ranges from;

  • 0  (perfectly reflective, no sound absorption) to
  • 1  (perfectly absorptive, all sound is absorbed)

Based on the coefficient of absorption for each material listed, the best choice for sound absorption would be Heavy curtains.

Heavy curtains are often designed with sound-absorbing properties, and they can have a coefficient of absorption higher than other materials like wood, concrete, or carpet.

The ranking of the absorption of the materials are;

Heavy curtains (0.5)  >  Carpet (0.2) > Wood (0.05) > Concrete (0.02)

Learn more about sound absorption here: brainly.com/question/16297116

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Coefficients of Absorption for Common Materials

(from Penn Foster) ⭐⭐⭐⭐⭐

Material                                            Coefficient of Absorption

Perforated acoustic ceiling material                              60%

Heavy curtains  (A)                                                            50%

Carpeting  (D)                                                                     20%

Wood  (B)                                                                              5%

Plaster                                                                                  3%

Clay tile                                                                                 3%

Concrete (C)                                                                         2%

The answer is A. Heavy curtains ✅

Where does sugar enter the blood?

Answers

After we eat, blood sugar concentratons rise, the pancreas releases insulin automatically so that the glucose enters cells, as more and more cells receive glucose, blood sugar levels come down to normal again. Exces glucose is stored as glycogen in the liver and muscles.Hope this helps.

Help please thanks in advance x Red and violet are at opposite ends of the spectrum of visible light.
Describe two things they have in common and two ways in which they differ. X

Answers

Difference: red has a higher wavelength than violet

Difference: the waves at the violet end of the spectrum are more damaging to you (e.g. Gamma rays are more harmful than radio waves).

Find the sum. Express the answer in scientific notation. (1.54 x 10^6)+(6.15 x 10^6)​

Answers

Answer:

{ \tt{(1.54 * {10}^(6)) + (6.15 * {10}^(6)) }} \n = { \tt{(1.54 + 6.15) * {10}^(6) }} \n = { \tt{7.69 * {10}^(6) }}
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