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4 years ago

How are electromagnetic waves different from ocean waves

Physics

1 answer:

nlexa [21]4 years ago

5 0

Answer:

Explanation:

Electromagnetic waves are different from ocean waves through their mode of propagation

Electromagnetic waves are Those waves that do not requires any material medium for their propagation. examples of electromagnetic waves are, Light wave, radiant heat, radio wave,

While

Ocean Waves are classified under mechanical waves, because they required a material medium for the to be to be propagated.

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You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 690.0 kg and was tra

kirza4 [7]

Answer:

115 km/h

Explanation:

$m_1$ = Mass of car A = 690 kg

$m_2$ = Mass of car B = 520 kg

g = Acceleration due to gravity = 9.81 m/s²

a = Acceleration

u = Initial velocity

v = Final velocity

$a=\mu g\\\Rightarrow a=0.75\times 9.81\\\Rightarrow a=7.3575\ m/s^2$

$v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 7.3575\times 6+0^2}\\\Rightarrow v=9.396\ m/s$

$m_1u_1 + m_2u_2 =(m_1 + m_2)v\\\Rightarrow u_1=\frac{(m_1 + m_2)v-m_2u_2}{m_1}\\\Rightarrow u_1=\frac{(690+520)9.396-520\times -\frac{74}{3.6}}{690}\\\Rightarrow u_1=31.96\ m/s$

Converting to km/h

$31.96\times 3.6=115.056\ km/h$

Initial velocity of car A = 115 km/h

7 0

3 years ago

How to find the value of sin(90+ theta) ?

koban [17]

Sin(90 + θ)

By addition angle formula for sine.

sin90cosθ + cos90sinθ

1*cosθ + 0*sinθ

cosθ + 0

= cosθ

sin(90 + θ) = cosθ

6 0

3 years ago

A car drives 215km east and then 45km north. What is the magnitude of the cars displacement? Round you answer to nearest whole n

kifflom [539]

Answer: $219.65\ \text{km}$

Explanation:

Given

Car drives 215 km east and then 45 km North

Displacement is East direction is

$\Rightarrow \vec{r_1}=215\hat{i}$

Now, the displacement from that to 45 km North is given by

$\Rightarrow \vec{r_{21}}=45\hat{j}$

Net displacement is $\vec{r_2}$

$\Rightarrow \vec{r_2}=\vec{r_1}+\vec{r_{21}}\\\Rightarrow \vec{r_2}=215\hat{i}+45\hat{j}$

Magnitude of the displacement is

$\Rightarrow \left | r_{2} \right |=\sqrt{\left ( 215 \right )^2+\left ( 45 \right )^2}\\\Rightarrow \left | r_{2} \right |=\sqrt{48250}\\\Rightarrow \left | r_{2} \right |=219.65\ \text{km}$

5 0

3 years ago

How much salt (nacl) is carried by a river flowing at 30.0 m3/s and containing 50.0 mg/l of salt? give your answer in kg/day?

slamgirl [31]

Answer: 129,600kg/day
In this question, you are given the river flow (30m3/s) and the salt concentration. Then to determine the amount of salt carried, you simply need to multiply the flow with concentration. Be careful because the unit in this question is different and need to be converted. The equation would be:

Salt = river flow x salt concentration
Salt = 30m3/s x 1000L/m3 x 50mg/L = 1,500,000mg/second

Then convert it into kg/day
Salt= 1,500,000mg/second x 10^-6 kg/mg x (3600 second/hour) x (24 hour/day)= 129,600kg/day

7 0

3 years ago

Where do estuaries form?

vekshin1

Answer:

An estuary is the area where a river meets the sea or ocean, where fresh water from the river meets salt water from the sea.

7 0

3 years ago

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