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2 years ago

Electromagnetic waves with wavelength between about 1 cm and 20 cm are called??

Physics

1 answer:

kodGreya [7K]2 years ago

8 0

I believe the answer is Microwaves (just to clarify, not the oven). They're widely used for communications.<span />

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A point charge q1 = 4.10 nC is placed at the origin, and a second point charge q2 = -2.90 nC is placed on the x-axis at x = + 20

kaheart [24]

Answer:

1) U = -4.436 10-7 J , 2) r13 = 0.6937 m

Explanation:

The electric potential energy is given by the equation

U = k Σ $q_{i}$ $q_{j}$ / $r_{ij}$

1. Let's apply this equation to our case

U = k (q1q3 / r13 + q1 q2 / r12 + q2 q3 / r23)

Let's reduce all magnitudes to the SI system

q1 = 4.10 nC = 4.10 10-9 C

q2 = -2.90 nC = -2.90 10-09 C

q3 = 2.00 nC = 2.00 10-9 C

Let's look for the distances

r13 = 11-0 = 11 cm = 11 10-2 m

r12 = 20-0 = 20 cm = 20 10-2 m

r23 = 20 -11 = 9 cm = 9.0 10-2 m

Let's calculate the electric potential

U = 8.99 109 [(4.10 2.00) 10-18 / 11 10-2 + (4.10 (-2.90)) 10-18 / 20 10-2 + (-2.90 2.00) 10-18 / 9.0 10-2]

U = 8.99 [0.7455 - 0.5945 - 0.6444) 10-7

U = -4.436 10-7 J

2. ask to find the position of q3 for the energy to be zero

U = 0 = k (q1q3 / r13 + q1 q2 / r12 + q2 q3 / r23)

In this case the distance between 1 and 2 is fixed, since the load that is placed is 3

q1 q2 / r12 = - q1 q3 / r13 - q2 q3 / r23

-11.89 10-18 / 20 10-2 = -8.20 10-18 / r13 + 5.810-18 / r23

-0.5945 102 = -8.20 / r13 + 5.810 / r23

Let's relate the distances, the maximum separation esr12 which is 20 10-2 m

r12 = r13 + r23

r13 = r12 -r23

r13 = 2010-2 - r23

we replace

-0.5945 102 = -8.20 / (20 10-2 - r23) + 5.810 / r23

Let's solve this equation

-0.5945 102 (2010-2 - r23) = -8.20 r23 + 5.810 (2010-2 - r23)

- 11.89 + 0.5945 r23 = -8.20 r23 + 1,162 - 5,810 r23

-11.89 - 1,162 = - 8.20 r23 -5,810 r23 - 0.5945 r23

-13.052 = r23 (-14.6045)

r23 = 13.052 / 14.6045

r23 = 0.8937 m

The distance from the origin is

r13 = -r12 + r23

r13 = -20 10-2 + 0.8937

r13 = 0.6937 m

3 0

2 years ago

Collectively living organisms, air, water, and soil constitute the

Bas_tet [7]

B. Natural environment

8 0

3 years ago

A Find the magnitude of the angular momentum of the second hand on a clock about an axis through the center of the clock face. T

julia-pushkina [17]

Answer:

L = 1.41 x 10⁻⁵ kg.m²/s

Explanation:

First, we need to find the linear speed of the second hand of the clock. Since, we know that second hand completes one revolution in 60 seconds. Therefore, its angular velocity will be:

ω = (1 rev/60 s)(2π rad/ 1 rev)

ω = 0.105 rad/s

Now, for linear speed we use formula:

v = rω

where,

v = linear speed = ?

r = radius of circle = length of hand = 15 cm = 0.15 m

Therefore,

v = (0.15 m)(0.105 rad/s)

v = 0.016 m/s

Now, to find the angular momentum of second hand, we use the following formula:

L = m v r

where,

L = Angular Momentum of Second-Hand = ?

m = mass of second-hand = 6 g = 0.006 kg

Therefore,

L = (0.006 kg)(0.016 m/s)(0.15 m)

6 0

2 years ago

What is the source of energy that directly drives atp synthase in its production of atp? hints what is the source of energy that

Alex787 [66]

The main source of energy for atp production through the process of photosynthesis is the sun's heat energy. Basically, it is the main driving force for a plant's metabolic reactions.

Thank you for posting your question here at Brainly. I hope I was able to help.

8 0

3 years ago

It's easier to eliminate negative self talk when we

ollegr [7]

I believe your answer would be try not to think of the worst things that can happen. <span />

7 0

3 years ago