PHYSICS HIGH SCHOOL

Why is it important for scientists to share information from their investigation?

Answers

Answer 1
Answer: So that such information can be analysed, scrutinised and verified with the use of experiments. Good scientists are naturally sceptical about the information that they produce. They strive to produce reliable and testable theories (using the information they have at their disposal) which can be used to find cures for diseases and also to develop the technology of the future.

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Brilliant***Thank you

There are some cases where distance time graph of a particle is vertical . So could you please tell me when it is possible????

Answers

-- If time is the horizontal axis and distance is the vertical axis, then it's not possible
for the particle's distance/time graph to be a vertical line.  That would indicate that
the particle covered some distance in zero time, indicating infinite speed.

-- If distance is the horizontal axis and time is the vertical axis, and the particle's
distance/time graph is a vertical line, then that indicates that the particle's distance
doesn't change with time. In other words, the particle is at rest, and its speed is zero.
when the body is in rest or in constant speed

A is a process that involves reactants and products

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I think the answer is chemical reactions.

Describe and explain how the movement and arrangement of the particles in a block of ice change as the ice melts to form liquid water. In your answer, include ideas about energy transfer.

Answers

Answer:

Ice is water in solid phase, in this phase, the particles are very close together and relatively in fixed positions.

As the temperature starts to increase (thermal energy), also does the kinetic energy of the particles (so we have a change from thermal energy to kinetic energy), so they start to move "more", and the position of the particles starts to be less "fixed". There is a point where the particles have enough energy, and this point is where the phase of the water changes from solid to liquid phase (the fusion point). After this point the water can not hold his shape, and takes the shape of the container where it is.

What is the suprising thing that happens in a superconductor

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One of the most surprising things about a superconductor is that
it has NO electrical resistance. The resistance doesn't just become
very very very small.  It becomes literally completely zero. (This is
a big part of the reason why it's called a "super-conductor".)

If you start an electric current flowing in a superconductor, you can
connect the ends of it together, and the current keeps going around
and around the loop and never dies out !

A skier has an acceleration of 2.5 m/s2. How long does it take her to come to a complete stop from a speed of 18 m/s?

Answers

(Assuming acceleration is -2.5m/s2) 7.2 seconds.
a = 2.5 m/s²

since , we have to stop so v = 0 m/s ( final velocity)

u = 18 m/s

t = ?

using ,

⇒ v = u + at

⇒ 0 = 18 + 2.5t

by this we are getting t<0 , since , t cant be -ve , Check your question

A complete series circuit consists of a 12.0 V battery, a 4.70 O resistor, and a switch. The internal resistance of the battery is 0.30 O. The switch is open. What does an ideal voltmeter read when placed across the terminals of the switch?12.0 V
9.40 V
2.40 V
zero

Answers


With the switch open, there's no current in the circuit, and therefore
no voltage drop across any of the dissipative elements (the resistor
or the battery's internal impedance).  So the entire battery voltage
appears across the switch, and the voltmeter reads 12.0V .
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what environmental conditions might cause damage to the alveolar sacs, and what would be the consequences of that damage?
A 9.0 volt battery is connected to four resistors in a parallel circuit. The resistors have 7.0 Ω, 5.0 Ω, 4.0 Ω, and 2.0 Ω respectively. What is the total current in the circuit?
Suppose you have two magnets. Magnet A doesn't have its poles labeled, but Magnet B does have a clearly labeled north and south pole. If these two are brought into contact with one another, which of the following could you expect? A. The side of Magnet A that's attracted to Magnet B's north pole must be Magnet A's north pole. B. The side of Magnet A that's repelled by Magnet B's south pole must be Magnet A's north pole. C. The side of Magnet A that's attracted to Magnet B's south pole must be Magnet A's north pole. D. The side of Magnet A that's repelled by Magnet B's north pole must be Magnet A's south pole