Ask question

Ask question

All categories

3 years ago

9

A student creates an electromagnetic wave and then reverses the direction of the current. Which of the following will happen to

the magnetic field?

1 answer:

mash [69]3 years ago

7 0

Answer:

I believe the electromagnetic field should be reversed.

Explanation:

You might be interested in

Plz help with these 5 The backbone is made up of 26 small bones called ___________. What are the characteristics of bones? (list

spin [16.1K]

Answer:

The backbone, spine or vertebral column is made up of 26 small bones called the vertebrae.

The characteristics of bones include:

1. They are strong and rigid

2. They are composed of bone cells called osteocytes.

3. They are lightweight

4. They have a honeycomb-like matrix internally, which helps to give them rigidity.

5. They exist in various types and shapes.

6. They have the ability to grow and repair when damaged

7. They contain inorganic minerals such as calcium and phosphate

The two types of joints are the movable and immovable joints.

Ligaments are bands of tough elastic fibrous tissue around that found around the joints whose function is to link bone to bone, give support to joints as well as limit their movement.

Explanation:

The backbone, spine or vertebral column is made up of 26 small bones called the vertebrae. The 26 small bones include 24 separate vertebrae interspaced with cartilage, and then additionally the sacrum and coccyx. The vertebral column is divided into five regions: cervical, thoracic, lumbar, sacral and coccygeal regions.

A bone is a rigid tissue that is part of the skeleton in vertebrate animals. The characteristics of bones include:

1. They are strong and rigid

2. They are composed of bone cells called osteocytes.

3. They are lightweight

4. They have a honeycomb-like matrix internally, which helps to give them rigidity.

5. They exist in various types and shapes.

6. They have the ability to grow and repair when damaged

7. They contain inorganic minerals such as calcium and phosphate

Joints are the junctions where two bones meet. They serve various functions which include allowing for movement of the body and binding the skeleton together.

The two types of joints are the movable and immovable joints.

Ligaments are bands of tough elastic fibrous tissue around that found around the joints whose function is to link bone to bone, give support to joints as well as limit their movement.

4 0

3 years ago

What is the wavelength of an fm radio signal that has a frequency of 91.7 mhz?

Digiron [165]

Answer:

The wavelength of the radio wave will be 3.271 m

Explanation:

We have given frequency of the radio signal $f=91.7MhZ=91.7\times 10^6Hz$

Speed of the light $c=3\times 10^8m/sec$

We have to find the wavelength of the radio signal

We know that wavelength is given by $\lambda =\frac{c}{f}=\frac{3\times 10^8}{91.7\times 10^6}=3.271m$

So the wavelength of the radio wave will be 3.271 m

3 0

3 years ago

A steel rod with a length of l = 1.55 m and a cross section of A = 4.89 cm2 is held fixed at the end points of the rod. What is

Vedmedyk [2.9K]

Answer:

The size of the force developing inside the steel rod is 32039.28 N

Explanation:

Given;

length of the steel rod, L = 1.55 m

cross sectional area of the steel, A = 4.89 cm²

temperature change, ∆T = 28.0 K

coefficient of linear expansion for steel, α = 1.17 × 10⁻⁵ 1/K

Young modulus of steel, E = 200.0 GPa.

Extension of the steel is given as;

α ∆T L = FL / AE

α ∆T = F/AE

F = AEα ∆T

F = ( 4.89 x 10⁻⁴)(200 x 10⁹)(1.17 × 10⁻⁵)(28.0 K)

F = 32039.28 N

Therefore, the size of the force developing inside the steel rod when its temperature is raised, is 32039.28 N

7 0

3 years ago

Ở nhiệt độ không đổi, dưới áp suất 10^4 Pa l, một lượng khí có thể tích 10l. Tính thể tích lượng khí đó dưới áp suất 5.10^4 Pa

gtnhenbr [62]

Answer:

Thể tích cuối cùng, V2 = 2 L

Explanation:

Cho các dữ liệu sau đây;

Khối lượng ban đầu = 10 L

Áp suất ban đầu = 10⁴ = 10000 Pa

Áp suất cuối cùng = 5 * 10⁴ = 50000 Pa

Để tìm tập mới hoặc tập cuối cùng, chúng ta sẽ sử dụng định luật Boyle;

Để tìm tập mới V2, chúng tôi sẽ sử dụng định luật Boyles.

Boyles phát biểu rằng khi nhiệt độ của khí lý tưởng được giữ không đổi, áp suất của khí tỉ lệ nghịch với thể tích mà khí chiếm giữ.

Về mặt toán học, định luật Boyles được đưa ra bởi;

$PV = K$

$P_{1}V_{1} = P_{2}V_{2}$

Thay vào phương trình, ta có;

$10000 * 10 = 50000V_{2}$

$100000 = 50000V_{2}$

$V_{2} = \frac {100000}{50000}$

$V_{2} = 2$

Thể tích cuối cùng, V2 = 2 L

6 0

3 years ago

A 1056-hertz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the freque

boyakko [2]

Answer:

E

Explanation:

There is not enough information in the question. A beat is the observed differences between two frequencies.

Hence, 3 beat represents a difference of 3-hertz between the two frequencies. So the frequency of the piano string could be 1056+3 = 1059-hertz or 1056-3= 1053-hertz.

In order to ascertain the actual value i.e if it is an increase or a decrease in frequency observed, we need more information.

4 0

3 years ago