PHYSICS HIGH SCHOOL

Name human body organs where magnetism is significant

Answers

Answer 1
Answer: It has been hypothesized, and some studies have supported the conjecture,
that certain species of insects and birds are able to sense the direction of external
magnetic fields.

I don't think there is any such notion where human beings are concerned.

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Imagine that a car is traveling from your left to your right at a constant velocity. Which two actions could the driver take that may be represented as (a) a velocity vector and an acceleration vector both pointing to the right and then (b) changing so the velocity vector points to the right and the acceleration vector points to the left?
Which one is an accurate description of the process of erosion? A. breaking rocks into smaller pieces B. forming rocks and depositing them in new places C. moving bits of rock and soil across the earth’s surface by water, wind, or glaciers D. water moving over the earth's surface and into the atmosphere
Which does not represent a change in velocity?Group of answer choicesA person is riding a bicycle at 4 m/s west and decreases her speed to 3 m/s.A plane is flying south at 600 km/h and then flies directly upwards before returning to the airport.A balloon is floating up into the air at 1 m/s.A bus is traveling west at 2 m/s and then turns a corner.
If a ball was thrown upward at 46.3 m/s how long would the ball stay in the air
What storm causes flash floods? Tornado ThunderstormHurricane

Who was the first person to discover wormholes?

Answers

The first who discovered The Einstein Roses bridge it was discovered by Ludwig flamm in 1916 a few months after Schwarzschild published his solution and was rediscovered by Albert Einstein and his colleague Nathan Rosen which was published then in 1935

as stated in the other ans, wormhole or its scientific name, Einstein–Rosen bridge, was discovered by Ludwig Flamm in 1916. But note that Flamm's discovery was through a general relativity solution on black hole dimension by Schwarzschild. Both Schwarzschild's solution and Flamm's discovery are purely mathematical - no wormhole in reality has been found so far.

Oppositely charged objects attract each other. This attraction holds electrons in atoms and holds atoms to one another in many compounds. However, Ernest Rutherford’s model of the atom failed to explain why electrons were not pulled into the atomic nucleus by this attraction. What change to the atomic model helped solve the problem seen in Rutherford’s model?

Answers

Answer:

A) Bohr’s work with atomic spectra led him to say that the electrons were limited to existing in certain energy levels, like standing on the rungs of a ladder.

Explanation:

Final answer:

The change to the atomic model that helped solve the problem seen in Rutherford's model was the discovery of the strong nuclear force.

Explanation:

Rutherford's model required that the electrons be in motion. Positive and negative charges attract each other, so stationary electrons would fall into the positive nucleus. However, Rutherford's model failed to explain why electrons were not pulled into the atomic nucleus by this attraction. The change to the atomic model that helped solve this problem was the discovery of the strong nuclear force, which is much stronger than electrostatic interactions and holds the protons and neutrons together in the nucleus.

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HELP ME PLEASEIn which prenatal stage is a fetus' genitalia clearly male or female?
A. zygote stage B. germinal stage C. embryonic stage D. fetal stage

Answers

In the fetal stage, the genitalia of a fetus is developed. Thus option D, the fetal stage is correct.

What is the prenatal stage?

The time period from the formation of the zygote to the parturition is called the prenatal stage and it is also known as the antenatal stage. In this stage, division and differentiation of the zygote take place to form an embryo, and then the development of the embryo to form a fetus.

The prenatal stage consists of 3 stages:

1) Germinal stage

2) Embryonic stage

3) Fetal stage

The time period of the first two weeks after conception is known as the germinal stage, from the third to eighth week is the embryonic stage, this stage begins after implantation, and from the ninth week to the parturition is the fetal stage. The genitalia of a fetus can be clearly differentiated by the twelfth week.

Therefore, option D, the fetal stage is correct.

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Answer:

D is the right answer

Explanation:

18. The orbits of planets being elliptical was one the planetary laws developed by

Answers

It was a man named Johannes Kepler. 

A man is standing on a weighing machine on a ship which is bobbing up and down with simple harmonic motion of period T=15.0s.Assuming the motion is vertical calculate the amplitude of the ship's motion, if the scale reading of the machine varies between limits of 55.0kg and 65.0kg.

Answers


Well, first of all, one who is sufficiently educated to deal with solving
this exercise is also sufficiently well informed to know that a weighing
machine, or "scale", should not be calibrated in units of "kg" ... a unit
of mass, not force.  We know that the man's mass doesn't change,
and the spectre of a readout in kg that is oscillating is totally bogus.

If the mass of the man standing on the weighing machine is 60kg, then
on level, dry land on Earth, or on the deck of a ship in calm seas on Earth,
the weighing machine will display his weight as  588 newtons  or as 
132.3 pounds.  That's also the reading as the deck of the ship executes
simple harmonic motion, at the points where the vertical acceleration is zero.

If the deck of the ship is bobbing vertically in simple harmonic motion with
amplitude of M and period of 15 sec, then its vertical position is 

                                     y(t) = y₀ + M sin(2π t/15) .

The vertical speed of the deck is     y'(t) = M (2π/15) cos(2π t/15)

and its vertical acceleration is          y''(t) = - (2πM/15) (2π/15) sin(2π t/15)

                                                                = - (4 π² M / 15²)  sin(2π t/15)

                                                                = - 0.1755 M sin(2π t/15) .

There's the important number ... the  0.1755 M.
That's the peak acceleration.
From here, the problem is a piece-o-cake.

The net vertical force on the intrepid sailor ... the guy standing on the
bathroom scale out on the deck of the ship that's "bobbing" on the
high seas ... is (the force of gravity) + (the force causing him to 'bob'
harmonically with peak acceleration of  0.1755 x amplitude).

At the instant of peak acceleration, the weighing machine thinks that
the load upon it is a mass of  65kg, when in reality it's only  60kg.
The weight of 60kg = 588 newtons.
The weight of 65kg = 637 newtons.
The scale has to push on him with an extra (637 - 588) = 49 newtons
in order to accelerate him faster than gravity.

Now I'm going to wave my hands in the air a bit:

Apparent weight = (apparent mass) x (real acceleration of gravity)

(Apparent mass) = (65/60) = 1.08333 x real mass.

Apparent 'gravity' = 1.08333 x real acceleration of gravity.

The increase ... the 0.08333 ... is the 'extra' acceleration that's due to
the bobbing of the deck.

                        0.08333 G  =  0.1755 M

The 'M' is what we need to find.

Divide each side by  0.1755 :          M = (0.08333 / 0.1755) G

'G' = 9.0 m/s²
                                       M = (0.08333 / 0.1755) (9.8) =  4.65 meters .

That result fills me with an overwhelming sense of no-confidence.
But I'm in my office, supposedly working, so I must leave it to others
to analyze my work and point out its many flaws.
In any case, my conscience is clear ... I do feel that I've put in a good
5-points-worth of work on this problem, even if the answer is wrong .

CondensationRadiationConvectionConduction transfers heat within the atmosphere and ocean.

Answers

Answer:

Explanation:

Sun is the only source of heat on earth. Heat from sun first passes through atmosphere and then fall on the earth's surface i.e. land and ocean.

Condensation, Radiation, Convection, Conduction transfers heat within the atmosphere and ocean such as rise of hot air, cooling and then falling is the example of convection whereas, heat from fire is the example of radiation.
condensation, radiation, convection, conduction are many ways heat is transferred from atmosphere to ocean. however heat comes from the sun then, to the atmosphere.
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A squirrel sitting on the ground starts to run with an acceleration of 5.1 m/s 2. How fast is the squirrel going after 0.25 seconds?A. 20.4 m/s B. 1.28 m/s C. 0.49 m/s D. 3.1 m/s