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Fantom [35]
3 years ago
10

An electromagnetic wave is traveling straight down toward the center of the Earth. At a certain moment in time the electric fiel

d points west. In which direction does the magnetic field point at this moment?
Physics
1 answer:
Anika [276]3 years ago
3 0

Answer:

North

Explanation:

In an electromagnetic wave, the direction of the wave, the direction of the electric field and the direction of the magnetic field are all perpendicular to each other.

Therefore, we can  find the direction of the magnetic field by using the right hand rule. We have:

- Index finger: direction of motion of the wave --> toward the center of Earth

- middle finger: direction of the electric field --> west

- thumb: direction of the magnetic field --> north

So, the magnetic field points north.

You might be interested in
A Ferris wheel has a radius R of 9.3 m and rotates four times each minute.
Murljashka [212]

Answer:

a) 1.63 m/s2

b) 474.8 N

c) 0 degree from the vertical

d) 339.4N

e) 0 degree from vertical

f) 412.51 N

g) 9.43 degrees from vertical

Explanation:

The wheel rotates 4 times each minute so 2π * 4 = 8π rad angle for each minute, or 8π/60 = 0.42 rad/s

(a) The centripetal acceleration of the rider when subjected to a constant angular velocity of 0.42 rad/s is

a_c = \omega^2r = 0.42^2*9.3 = 1.63 m/s^2

(b) When the rider is at the bottom of the ride, there's centripetal acceleration and there's also gravitational acceleration g = 9.81 m/s2. These 2 vectors are in the same direction (downward) so we can add up to calculate the total acceleration

a_b = g + a_c = 1.63 + 9.81 = 11.44 m/s^2

Using Newton's 2nd and 3rd laws we can calculate the magnitude of the force that the rider acts on the seat and also the reaction force that the seat acts on the rider

F_b = ma_b = 41.5*11.44 = 474.8 N

c) As gravity acceleration and centripetal acceleration have the same direction (downward), the reaction force would be align but opposite direction(upward) so it makes 0 degree with the vertical.

d) At highest point of the ride we have gravity acceleration acting down and centripetal acceleration acting up. They are in opposite direction

a_t = g - a_c = 9.81 - 1.63 = 8.18 m/s^2

Using Newton's 2nd and 3rd laws we can calculate the magnitude of the force that the rider acts on the seat and also the reaction force that the seat acts on the rider

F_t = ma_t = 41.5*8.18 = 339.4 N

e) As gravity acceleration and centripetal acceleration are on the same line but opposite direction. This force would also be pointing upward and makes 0 degrees with the vertical.

f) At 3 o'clock, gravity acceleration is pointing downward while centripetal acceleration is pointing side way to the right. These 2 vectors are perpendicular to each other so we can calculate the magnitude of the total acceleration using Pythagorean formula:

a_s = \sqrt{a_c^2 + g^2} = \sqrt{1.63^2 + 9.81^2} = \sqrt{2.6569 + 96.2361} = \sqrt{98.893} = 9.94 m/s^2

Using Newton's 2nd and 3rd laws we can calculate the magnitude of the force that the rider acts on the seat and also the reaction force that the seat acts on the rider

F_s = ma_s = 41.5*9.94 = 412.51N

g) The reaction force would have an angle α of

tan\alpha = \frac{a_c}{g} = \frac{1.63}{9.81} = 0.17

\alpha = tan^{-1}0.17 = 0.16 rad \approx 9.43 degrees  from the vertical.

8 0
3 years ago
Question 5 (1 point)
katovenus [111]

Answer:

The horizontal distance the ball travels is approximately 4.055 meters

Explanation:

The given parameters are;

The height from which the child kicks the ball = 3.5 m

The horizontal speed of the ball = 4.8 m/s

Therefore, we have;

The time it takes the ball to hit the ground is given by the relation;

h = u·t + 1/2·g·t²

Where;

u = The initial vertical velocity of the ball = 0 m/s

t = The time it takes the ball to hit the ground

g = The acceleration due to gravity = 9.81 m/s²

h = The height of the ball = 3.5 m

3.5 = 0 × t + 1/2 × 9.81 × t²

3.5 = 1/2 × 9.81 × t²

∴ t² = 3.5/(1/2 × 9.81)

∴ t = √(3.5/(1/2 × 9.81) = 0.8447 s

t ≈ 0.8447 s

The time the ball takes in flight = t ≈ 0.8447 s

Therefore;

The horizontal distance the ball travels = The horizontal velocity × The time of flight

∴ The horizontal distance the ball travels = 4.8 × 0.8447 ≈ 4.055

The horizontal distance the ball travels ≈ 4.055 meters.

8 0
3 years ago
The number that describes the main energy level of an electron in an atom is
Otrada [13]

Answer:

the principal quantum number (n)

Explanation:

Quantum numbers are found in the mathematical description given to each orbital (Schrödinger's wave equation). Schrödinger is the 5th atomic model and it seeks to describe the characteristics of all the electrons in an atom. These digits are represented by letters and each of them indicates the position and energy of each of them.

The main quantum number always has integer and positive numbers and allows us to know the energy level of the orbital as well as its size. N determines the measure of the orbital, so the greater the probability of finding an electron near the nucleus of an atone, the energy of the orbital increases. All those groups of orbitals that share the same value of N are known as level or layer.

The values ​​that the main quantum number (n) can adopt can be positive integers such as: n = 1, 2, 3, 4, 5, 6, 7

7 0
3 years ago
I need help someone answer, thanks!
Sonja [21]

Answer:

The third one.

Explanation:

fhfztdgjkhhi

5 0
3 years ago
Read 2 more answers
Bob is pulling a 30kg filing cabinet with a force of 200n , but the filing cabinet refuses to move. the coefficient of static fr
puteri [66]
The cabinet is being pulled with 200N and is being rested by a force equal to 200N. That is why it is not being moved. 


<span>Although the force of static friction can equal Fk=µs*F=m*g*µs=(30kg)*(9.8m/s^2)*(0.80)=235 N. It is not resisting the 200N force with 235N. Imagine if you pushed something with 200N and it pushed you back with 235N, especially a cabinet. You would think that the cabinet was alive.</span>
8 0
3 years ago
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