PHYSICS HIGH SCHOOL

An insect is able to walk across the surface of a pond without sinking because of the A. polarity of the water molecules.
B. process of evaporation.
C. surface tension of the water.
D. adhesion of the insect's feet to the surface of the water.

Answers

Answer 1
Answer: C. surface tension of the water.
Answer 2
Answer: the answer to that will be D because it has nothing at all to do with the water because either way the water shall stay the same if the animal or insect could or could not be able to walk on water.

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A 3.00 kg toy falls from a height of 10.0 m. Just before hitting the ground, what will its kinetic energy be?

The sentence Walking the wire, my dog waited for the squirrel to fall is an example of _____.split infinitive
parallel structure
dangling participle
none of these

Answers

The answer is dangling participle. The dog wasn't walking the wire, the squirrel was. It is modifying the wrong noun.

Answer:

dangling participle

Explanation:

A speed versus time graph is shown:15.
Which statement accurately describes the motion of the object in the graph above? Options: Option 1: It is moving from 0s to 4s at a constant speed of 2 cm/s. Option 2: It is at rest for 4 seconds from 4s to 8s and then speeds up. Option 3: It is moving from 4s to 8s at a constant speed of 4 cm/s. Option 4: It is speeding up from 0s to 4s, then it is at rest.

Answers

Option 3: It is moving from 4s to 8s at a constant speed of 4 cm/s.

Volume is a measure of the quantity of matter in an object. br>

Answers


Not so !  Not only is that statement essentially false,
but it involves significant prevarication as well, too.

Mass is the measure of the quantity of matter in an object.
Volume is a measure of the quantity of space filled by the
object. 

The same mass can have many different volumes, usually
depending on its temperature.  Just consider one kilogram
of ice, water, and steam . . .

Thermal energy is added to a sample, its particles move ?

Answers

Yes, if the temperature increases, than that means the particles are moving faster. Temperature is the measure of movement of particles in an object or substance.

By thermal energy, you mean adding heat correct....? I'm not very good at this sort of thing, but I gave you what I have..

The moon's mass is 7.35 × 1022 kg, and it moves around the earth approximately in a circle or radius 3.82 × 105 km. The time required for one revolution is 27.3 days. Calculate the centripetal force that must act on the moon. How does this compare to the gravitational force that the earth exerts on the moon at that same distance?

Answers

Explanation:

It is given that,

Mass of moon, m=7.35* 10^(22)\ kg

Radius of circle, r=3.82* 10^(5)\ km=3.82* 10^(8)\ m

The time required for one revolution is 27.3 days, t = 27.3 days

1 day = 86400 seconds

27.3 days = 2358720 seconds

Let v is the speed of moon around the circular path. It is given by :

v=(2\pi r)/(T)

v=(2\pi * 3.82* 10^(8)\ m)/(2358720\ s)

v = 1017.57 m/s

Let F is the centripetal force acting on the moon. It is given by :

F=(mv^2)/(r)

F=(7.35* 10^(22)\ kg* (1017.57\ m)^2)/(3.82* 10^(8)\ m)

F=1.99* 10^(20)\ m/s^2

So, the centripetal force that must act on the moon is 1.99* 10^(20)\ m/s^2. The gravitational force that the earth exerts on the moon at that same distance is also equal to 1.99* 10^(20)\ m/s^2. Hence, this is the required solution.

What does the slope of the line on this velocity versus time graph represent? A.
positive deceleration

B.
zero acceleration

C.
positive acceleration

D.
negative acceleration

Answers

What do you mean when you say "this" graph ?  I don't see any graph.

First of all, I'm sure you don't have a "velocity versus time" graph.
You may have a "speed versus time" graph, that doesn't show any
information about the direction of the motion.

As you look at your graph ... a feat that's impossible for me ... 

-- If the line is horizontal, then speed is not changing.  If the direction
of motion is also not changing, then there is zero acceleration.  Sadly,
the graph most likely doesn't carry any information about the direction. 
It's possible that the speed is constant but the direction is changing.
Then acceleration isn't zero, but you can't tell that from the graph.

-- If the line is proceeding upward from left to right, whether it's straight
or curving, then there is positive acceleration.

-- If the line is proceeding downward from left to right, whether it's straight
or curving, then there is negative acceleration, or what some people might
call "positive deceleration".
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