PHYSICS HIGH SCHOOL

Dua buah vektor, yaitu P= 6i-5j+2k dan Q = 2i+2j+8k. Tentukan vektor R agar P-Q+R=0. Hitung pula besar vektor R?

Answers

Answer 1

Answer:

As it is given to us

$P = 6i - 5j + 2k$

$Q = 2i + 2j + 8k$

also it is given that

P - Q + R = 0

so here we can rearrange it to find the value of R

$R = Q - P$

so here we have

$R = (2i + 2j + 8k) - (6i - 5j + 2k)$

$R = -4\hat i + 7\hat j + 6\hat k$

so the vector is given by above equation

Answer 2

Answer:

Answer:

R= -4 i + 7 j + 6 k

Explanation:

Being P - Q + R = 0, solving for R you get:

R= Q - P

You know:

P=6 i - 5 j + 2 k
Q=2 i + 2 j + 8 k

Replacing the expressions of P and Q you get:

R= (2 i + 2 j + 8 k) - (6 i - 5 j + 2 k)

i, j and k indicate that the values correspond to the x, y and z components respectively. To subtract the vectors, their respective components are subtracted from each vector. So in this case:

R= (2-6) i + [2-(-5)] j + (8-2) k

So the answer is:

R= -4 i + 7 j + 6 k

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Answers

X - rays are considered an oxidizing mutagenic agent. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.

Calculate the wavelength of a wave if 5 complete waves occupy a length of 20m

Answers

The wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

What is wavelength?

Wavelength is defined as the space between waves' crests, particularly between electromagnetic or sound wave points. A recurring event's frequency is measured by how many times it occurs in a unit of time. To underline the difference from spatial frequency, it is also occasionally referred to as temporal frequency.

There is an inverse relationship between the frequency and the wavelength of the waves as the wavelength increases the frequency decreases and if the wavelength decreases the frequency increases.

Given that a wave has 5 complete waves occupying a length of 20m. The wavelength of the wave will be calculated as below:-

λ = Distance / frequency

λ = 20 / 5

λ = 4 meters

Therefore, the wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

To know more about wavelength follow

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the answer is 20 / 5 = 4

What is the difference in the charges on a ballon rubbed in your hair and a glass rod rubbed

Answers

The balloon steals electrons from your hair, leaving the hair positively charged, and the balloon negatively charged. It causes hair to be apart from each other, because it has the same charge. Glass has a weaker hold on electrons, and silk absorbs the lost electrons.

An isometry preserves
orientation
distance
direction

Answers

Answer:

Distance

Explanation:

Isometry preserves the distance while transformation is made in between metric spaces. When a metric space is mapped on to another or itself, the distance between two points remains same in the images in the mapped space as well. Example: rotation and translation.

Thus, isometry preserves the distance.

Answer:

distance

Explanation:

A textbook of mass 2.09 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.190 m, to a hanging book with mass 3.08 kg. The system is released from rest, and the books are observed to move a distance 1.26 m over a time interval of 0.800 s.

Answers

Answer:

The tension in the part of the cord attached to the textbook is 6.58 N.

Explanation:

Given that,

Mass of textbook = 2.09 kg

Diameter = 0.190 m

Mass of hanging book = 3.08 kg

Distance = 1.26 m

Time interval = 0.800 s

Suppose,we need to calculate the tension in the part of the cord attached to the textbook

We need to calculate the acceleration

Using equation of motion

$y=ut+(1)/(2)at^2$

$a=(2y)/(t^2)$

Put the value into the formula

$a=(2*1.26)/(0.800)$

$a=3.15\ m/s^2$

We need to calculate the tension

When the book is moving with acceleration

Using formula of tension

$T=ma$

$T=2.09*3.15$

$T=6.58\ N$

Hence, The tension in the part of the cord attached to the textbook is 6.58 N.

How is pressure measured?a. Pressure is measured as force per inch
b. Pressure is measured as force per gram
c. Pressure is measured as force per unit area
d. Pressure is measured as force divided by mass
I think its D...

Answers

Answer: The correct answer is " Pressure is measured as force per unit area".

Explanation:

Pressure is defined as the force per unit area.

The expression for the pressure is as follows:

$P=(F)/(A)$

Here, F is the applied force and A is the area.

The pressure is inversely proportional to the area. More the area, lesser will be the pressure. Lesser the area, more will be pressure.

For example, the area of the strap of the school bag is more so that there will be less pressure on the students's shoulder.

Therefore, the correct option is (c).

Pressured is measured by the Force per unit area

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