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denpristay [2]
4 years ago
11

If an electromagnetic wave has components Ey = E0 sin(kx - ωt) and Bz = B0 sin(kx - ωt), in what direction is it traveling?

Physics
1 answer:
fomenos4 years ago
8 0

Answer:

Its traveling in the +x direction

Explanation:

The E-field is in the +y-direction, and the B-field is in the +z-direction, so it must be moving along the +x-direction, since the E-field, B-field and the direction of moving are all at right angles to each other.

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It takes Serina 0.55 hours to drive to school. Her route is 22 km long. What is Serina’s average speed on her drive to school?
Dmitrij [34]

Answer:

= 40 km/hr

Explanation:

<u>speed = distance / time</u>

= 22km / 0.55 hr.

= 40 km/hr

8 0
3 years ago
For a person with a Near Point (NP) = 45 cm, what would be his prescription's lens power = _________ diopters A) 1.08 diopters
natita [175]

Answer:

The power of lens is 2.22 D.

Explanation:

Given that,

Distance of image v= 45 cm

We know that,

Distance of object u= ∞

Power of lens is the reciprocal of focal length.

P=\dfrac{1}{f}

We need to calculate the power of lens

Using formula of lens

\dfrac{1}{f}=\dfrac{1}{v}+\dfrac{1}{u}

Where, f = focal length

v = image distance

u = object distance

Put the value into the formula

\dfrac{1}{f}=\dfrac{1}{45}+\dfrac{1}{\infty}

\dfrac{1}{f}=\dfrac{1}{0.45}+0

P=\dfrac{1}{f}=2.22

Hence, The power of lens is 2.22 D.

7 0
3 years ago
A machine is supplied Energy at a rate of 4000 W and does useful work at a rate of 3760 W. What is the efficiency of the machine
ICE Princess25 [194]
The efficiency of a machine is the ratio between the output power and the power in input:
\epsilon =  \frac{P_{out}}{P_{in}}
in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is
\epsilon =  \frac{3760 W}{4000 W} =0.94
So the efficiency of the machine is 94%.
6 0
3 years ago
Read 2 more answers
A child observes a caterpillar walking on a window sill. The caterpillar walks 18 cm to the left, then 6 cm to
horrorfan [7]

Answer: 34 cm

Explanation:

18+6+10=34 cm

4 0
4 years ago
What is the acceleration of a vehicle that goes from 70 m/s to a stop in 35 s?
belka [17]
U=70 , v= 0, t=35, a=?
v=u+at
0=70+a(35)
-70=35a
a=-2m/s^2
Decelerate 2ms^-2 or acceleration is -2ms^-2
7 0
3 years ago
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