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MAXImum [283]
2 years ago
8

One of the frequencies used to transmit and receive cellular telephone signals in the United States is 985 MHz. What is the wave

length in meters of these radio waves
Physics
1 answer:
tia_tia [17]2 years ago
5 0

Answer:

approximately 304358

Explanation:

wavelength = speed / frequency

speed of an electromagnetic wave is 299,792,458 m/s in a vacuum

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What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of the
Naddika [18.5K]
 <span>First lets determine the equation. Well at the top of the circle both the normal force and the weight are in the same direction. So we have Fnet=N+mg. Since this is a circular path the Fnet is also = to (mv^2)/r. 

We convert the situation where the rock is no longer in contact with the bottom to terms relevant to the equation. So, what is a requirement for normal force? The object must be in contact with the surface, meaning it can't be in free fall. Realizing this means that the instant when the object does not touch the bucket is where the normal force = 0. 

Now we have N+mg=(mv^2)/r where N=0 is the case we are interested in. This leaves 0+mg=(mv^2)/r 
Solve for v: 
v=(gr)^(1/2) or v=3.28m/s 
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7 0
3 years ago
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm^2, separated by a distance of 1.70 mm. A 2
Aleks04 [339]

Answer:

(a) 1.47 x 10⁴ V/m

(b) 1.28 x 10⁻⁷C/m²

(c) 3.9 x 10⁻¹²F

(d) 9.75 x 10⁻¹¹C

Explanation:

(a) For a parallel plate capacitor, the electric field E between the plates is given by;

E = V / d               -----------(i)

Where;

V = potential difference applied to the plates

d = distance between these plates

From the question;

V = 25.0V

d = 1.70mm = 0.0017m

Substitute these values into equation (i) as follows;

E = 25.0 / 0.0017

E = 1.47 x 10⁴ V/m

(c) The capacitance of the capacitor is given by

C = Aε₀ / d

Where

C = capacitance

A = Area of the plates = 7.60cm² = 0.00076m²

ε₀ = permittivity of free space =  8.85 x 10⁻¹²F/m

d = 1.70mm = 0.0017m

C = 0.00076 x  8.85 x 10⁻¹² / 0.0017

C = 3.9 x 10⁻¹²F

(d) The charge, Q, on each plate can be found as follows;

Q = C V

Q =  3.9 x 10⁻¹² x 25.0

Q = 9.75 x 10⁻¹¹C

Now since we have found other quantities, it is way easier to find the surface charge density.

(b) The surface charge density, σ, is the ratio of the charge Q on each plate to the area A of the plates. i.e

σ = Q / A

σ = 9.75 x 10⁻¹¹ /  0.00076

σ = 1.28 x 10⁻⁷C/m²

6 0
3 years ago
Knowing the P is 1110 N, determine the tension in the rope if the frame is in equilibrium. Express your answer in kN to the near
ra1l [238]

Explanation:

It is given that the value of P is 1110 N. And, for pin connection we have only two connections which are A_{x} and A_{y}. Let T be the tension is rope.

So,  \sum F_{y} = 0 and A_{y} - 1110 = 0

              A_{y} = 1110 N

     \sum F_{x} = 0

And,    T - A_{x} = 0

                  T = A_{x}

Also, \sum M_{A} = 0

                1110(0.75 + 0.75 + 0.75) - T(0.5 + 0.1) = 0

                    2497.5 - 0.6T = 0

                         T = 4162.5 N

                             = 4.16 kN

Therefore, we can conclude that the tension in the rope if the frame is in equilibrium is 4.16 kN.

3 0
3 years ago
An ammeter measures
uysha [10]

Answer:

Okey is my opinion C anyway

6 0
2 years ago
Describe a situation in which gravity causes a change in velocity
Katarina [22]
That's what happens whenever anything is dropped or falls.
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-- the cat jumps off the top of the refrigerator
-- the little boy slides down the slide
5 0
3 years ago
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