PHYSICS HIGH SCHOOL

Robert Hook discovered cells when viewing a _____ under a microscope.box
blood
cork
plant

Answers

Answer 1
Answer: What you need to do while answering this questions, is ask yourself what has cells - only if a thing has cells can you see those cells under a microscope. Objects of animal and plant origin have cells, so blood, plant and cork (made of tree bark) can have cells, and a box too, if it's made of wood. So we can''t exclude any answers based on this. We must then know the story of Robert Hook - and it was in fact a cork. He did this discovery around 1655. At the time his main interest was the microscope rather than the cork, and he used to cork to demonstrate the function of the microscope. The correct answer is CORK.

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The Greeks rejected the notion that the Earth orbits the Sun. Why? A.) They believed that the Sun is a God.B.) They weren't as smart as we are.
C.) They could not measure a change in stars' positions on the sky.
D.) They could not measure how big the Earth was.

Answers

B.) It ran contrary to their senses. Greeks knew that we should see stellar parallax if we orbited the Sun – but they could not detect it.

Which of the following does not contribute to Wellness

Answers

The option that does not contribute to wellness are tendencies. Tendencies are just things that you are more likely to do, or behavior that you are more likely to show, and in no way does that affect your wellness. However, your habits, exercise, and diet do, because all of these things have an impact on both your body and mind, thus creating a wellness of the entire human being.

What is the hottest layer in the Sun's atmosphere? photosphere corona core radiative zone chromosphere convective zone

Answers

The hottest layer in Sun's atmosphere is the Corona.The sun's atmosphere is composed of three main layers.1. Photosphere- the lowest layer and closest in distance from the the sun's core. It has an average temperature of 5,800 degrees Kelvin. It usually appears granulated and bubbly, like a simmering pot of water.2.Chromosphere- extends above the photosphere to about 2000 km. Its temperature is 4,500 - 10,000 degrees Kelvin.3. Corona - outermost layer of the sun, extending several million kilometers outward from the chromosphere into space. The average temperature averages 2 million degrees Kelvin. It is thought the sun's magnetism is the reason that the corona is so hot.

What is the hottest layer in the Sun's atmosphere?

Corona.

Which star is closest to our solar system (after the sun)? a. Vega b. Sirius c. Regulus d. Proxima Centauri

Answers

Answer:

d. Proxima Centauri

Explanation:

The star closest to our solar system(after the sun) is Proxima Centauri

Total discharge head includes?

Answers

The term “total” indicates that it includes the static pressure head (h), the velocity head (hv), and the elevation head (Z).

In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80m/s2 . Ignore air resistance. A flea jumps straight up to a maximum height of 0.460m . What is its initial velocity v0 as it leaves the ground?

Answers

As the flea jumps and leaves the ground, its speed is 'V₀'.

When the flea reaches its maximum height, its speed is zero.
(That's why it doesn't go any higher than that.)

Its average speed all the way up is

                      (1/2) (V₀ + 0)  =  V₀ / 2 .

  The time it takes for the original speed to dribble down to zero is

                                    V₀/g  =  V₀/9.8 .

Distance covered = (Average speed) x (time in motion)

              0.46 m  =               (V₀/2)   x   (V₀/9.8) 

               0.46  =    V₀² / 19.6

                   V₀²  =  (0.46 x 19.6)  =  9.016

                   V₀  =  √9.016  =  3 m/s  (rounded)
xf = 0. xi = 0. (you start and end at the same position, the ground). Your initial velocity is 2.62. gravity is 4.905. 

xf = xi + vi(t) + 1/2(a)t^2. 

0 = 0 + 2.62(t) + 1/2(-9.81)t^2 
0 = 2.62t - 4.905t^2 
4.905t = 2.62 
t = 2.62/4.905 
t = 0.5341488277268093781855249745158 
time in three significant figures: 
t = 0.534. 
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