PHYSICS HIGH SCHOOL

A neuron transfers information in the form of an electrical impulse.
a. True
b. False

Answers

Answer 1
Answer: A  - true 
A neuron transfers information to another neuron (synapses) in the form of electrical impulse. Due to this issue, the activity brain can be mesured.

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Why are some pots and pans designed with wooden handles?Wood is a conductor.

Wood has a high heat capacity.

Wood is an insulator.

Wood is an organic substance.

Answers

Answer: Wood is an insulator.

Explanation: Conductors are those substances which allow heat and electricity to pass through them.Example: Metals

Insulators are those substances which do not allow heat and electricity to pass through them. Example: wood

Pots and pans should be made of conducting material as the heat needs to be transferred from the burner to the pot and then to the food for cooking.

But the handles should be made from insulators so that they do not become hot and thus we can hold the utensil using the handles without getting burnt.
Wood doesn't get hot when it heats up, so number 3

Glass windows allow light in, but trap the heat inside. This describes _____. a greenhouse effect convection global warming conduction

Answers

Answer: The correct answer is green house effect.

Explanation:

Green house effect:It is a process in which the infrared rays coming from the sun gets absorbed or re-emitted in the atmosphere. In this way the heat is trapped in the atmosphere.

In the given problem, glass windows allow light in, but trap the heat inside. This effect is due to the green house effect.

Convection: It is a process in which there is an actual movement of heat particle.

Conduction: It is a process in which there is no actual movement of the particle. It transfers heat directly from one place to another.

Global warming: The gradual increase in the overall temperature of earth's atmosphere that causes change in the climate. It is the result of the green house effect.

Therefore, glass windows allow light in, but trap the heat inside. This describes green house effect.
Greenhouse effect allows earth to stay warm enough for life to survive, increasing the amount of the greenhouse effect can cause global warming which is not good for the life in the surface of the earth because they'll be experiencing more heat that the regular heat energy given by the sun.

A baseball on a T-ball stand has no momentum until it is hit with a bat. When Tyler swings the bat, it has a momentum of 12 kg m/s. After the bat hits the ball, the ball has a momentum of 8 kg m/s. What is the momentum of the bat AFTER it hits the ball

Answers

Answer:

4 kg m/s

Explanation:

According to the Law of Conservation of Momentum, the total momentum must be the same before and after a collision. The total momentum before the bat hit the ball was 12 kg m/s. After the collision, the ball has a momentum of 8 kg m/s. Therefore, the bat must have a momentum of 4 kg m/s.
positive direction : bat swing

total momentum before = after
12(bat) + 0(ball) = 8(ball) + bat-after

bat-after is positive then direction is the same

You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. Determine the frequency, period, and speed of these water waves.

Answers


Frequency = rate of sploosh = 2 per second  =  2 Hz.

Period = ( 1/frequency ) =  1/2  second

Speed = (wavelength) x (frequency) = (0.15m) x ( 2/sec) = 0.075 m/s .

An automobile covered the distance of 240 km between A and B with a certain speed. On its way back, the automobile covered half of the distance at the same speed and for the rest of the trip he increased his speed by 10 km/hour. As a result, the drive back took him 2 5 of an hour less than the drive from A to B. What was the automobile’s speed when it was driving from A to B?

Answers

Answer:

Therefore the speed of automobile when it was driving from A to B was 50 km/ h.

Explanation:

Given that,

An automobile covered the distance of 240 km between A and B with a certain speed.

Let the speed of the automobile be x km/hour.

We know that,

Time =(distance)/(speed)

Time taken to travel from A to B point is =(240)/(x) hours.

On its back, the automobile covered half of distance= 120 km at the same speed and for the trip he increased his speed 10 km/hour.

Time taken to complete the trip is

=((120)/(x)+(120)/(x+10)) hours

The driver took \frac25 of an hour less when he come back.

According to problem,

(240)/(x)-((120)/(x)+(120)/(x+10))=\frac25

\Rightarrow(240)/(x)- (120)/(x)-(120)/(x+10)=\frac25

\Rightarrow(240-120)/(x)-(120)/(x+10)=\frac25

\Rightarrow(120)/(x)-(120)/(x+10)=\frac25

\Rightarrow(120(x+10)-120x)/(x(x+10))=\frac25

\Rightarrow(120x+1200-120x)/(x^2+10x)=\frac25

\Rightarrow(1200)/(x^2+10x)=\frac25

\Rightarrow 2(x^2+10x)=1200* 5

\Rightarrow (x^2+10x)=(1200* 5)/(2)

\Rightarrow (x^2+10x)=3000

\Rightarrow x^2+10x-3000=0

\Rightarrow x^2+60x-50x-3000=0

⇒x(x+60)-50(x+60)=0

⇒(x+60)(x-50)=0

⇒x= -60, 50

The speed could not negative.

So, x=50

Therefore the speed of automobile when it was driving from A to B was 50 km/ h.

What is the exact meaning of croos section and cross sectional area of a conductor?

Answers

The cross section is the little tiny circle you see when you cut a wire
and look at the flat, cut end.

The cross-sectional area of the wire is the area of that little circle. 
It's equal to

                           Area = (pi) x (1/4) x (Diameter of the wire)²
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