PHYSICS HIGH SCHOOL

Describe how the design of a vacuum flask keeps the liquid inside hot ?

Answers

Answer 1
Answer: the gap between the two flasks is partially evacuated of air creating a near vacuum which significantly reduces heat transfer by conduction or convection 
Answer 2
Answer: The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection. Vacuum flasks are used domestically to keep beverageshot or cold.

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Kinetic energy is dependent on which of the following?
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A speeding car collides with an unlucky bug flying across the road Which explains why the impact doesn't equally damage the car and the bug A. The car has more momentumB.the bug is traveling fasterC. The bug has more momentumD. The net force is zero

Humpty Dumpty (12 kg) sat on a wall (2 m high). What was his potential energy, before his great fall? A. 235.2 J B. 235.2 N C. 24 J D. 246.1 W

Answers

I think it would be B. P.E.=mgh, the mass is 12g, gravitational force is 9.8, and the wall is 2 meters high, so multiply it all and get 235.2.
It would be 24J because there's no energy.

To test the hypothesis that plants grow faster in green light, a student set up 3 of the same type of plants. She placed the first plant under a green light, the second plant under a regular light bulb, and the third plant under a red light. What is the dependent variable in this experiment?

Answers


The dependent variable is the speed of plant growth, and the-plant's general health and welfare.

The hypothesis is defective.  It should talk about whether the plant is
DEPRIVED of any green light.  The way the experiment is described,
the results won't be clear.  The "regular" light bulb has a lot of green
wavelengths in it, along with a lot of other stuff that the plant may or
may not be interested in.  So the plant's response to the green light
AND the 'regular' light may be very similar.
 

What are the primary differences between stars and planets

Answers

Stars don't have moons and planets do
stars aren't big enough to emit enough kight and heat meaning they cant cause nuclear reactions

What occurs when parallel rays of light hit a rough or bumby surface

Answers

When parallel rays of light hit a rough or bumpy surface, there will be diffused reflection. Meaning, the light that bounces after it hits a rough or bumpy surface is not parallel anymore and cannot form an image. The answer to this question is 'diffused reflection'.

It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station is constructed as a 1600-m-diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. What rotation period will provide "normal"gravity?

Answers

The rotation period that will provide normal gravity will be 57.12 seconds.

From the information given, the diameter of the cylinder is 1600m. Therefore, the radius will be:

= Diameter / 2.

= 1600 / 2

= 800m

Acceleration due to gravity = 9.8m/s²

Since a = rw², we'll use the subject of the formula to find w and this will be:

w = √g/✓r

w = ✓9.8 / √800

w = 0.11 rad/s

Therefore, the rotation period will be:

T = 2π/w

T = 2π/0.11

T = (2 × 3.142) / 0.11

T = 57.12 seconds

In conclusion, the correct option is 57.12 seconds.

Read related link on:

brainly.com/question/13436796

Answer

given,

diameter of the cylinder = 1600 m

radius = 800 m                                  

acceleration due to gravity  = 9.8 m/s²

a = r ω²                                                  

\omega = \sqrt{(g)/(r)}

\omega = \sqrt{(9.8)/(800)}

\omega = 0.11\ rad/s      

we know time period                      

T = (2\pi )/(\omega )

T = (2\pi )/(0.11)

T = 57.12 s                              

Modern scientists say that electrons are found in a ...a. cloud
b. orbital
c. pudding
d. orb

Answers

B) orbital

Each electron has at most 2 orbitals with s,d and more.

Brainliest?
I think it might be a or d i hope i have helped :)
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