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3 years ago

What is a wave coming into a barrier

Physics

1 answer:

3241004551 [841]3 years ago

6 0

A wave looses its power as it comes to shore because it gets less deeper every second it gets closer to shore

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A car engine burns gas at 495 K, and exhausts to the air at 293 K. If it ran at the highest possible efficiency, how much input

slamgirl [31]

The heat taken to do the 10,000 J of work is 4081 J

<u>Explanation:</u>

The ratio of the temperature difference between the reservoirs and the temperature of the hot reservoir is termed as maximum thermal efficiency.

Maximum thermal efficiency is

1 - (Tc / Th).

where Tc represents the absolute temperature of the cold reservoir

Th represents the absolute temperature of the hot reservoir.

1 - (293/495) = 0.408

If the input is 10,000 J, then 4081 J is used to do work. The remaining 5919 J is rejected as heat into the air.

4 0

3 years ago

A laser used for many applications of hard surface dental work emits 2780-nm wavelength pulses of variable energy (0-300 mJ) abo

Bess [88]

Answer:

$n = 1.119 *10^{18} \ photons$

$P = 1.6 \ W$

Explanation:

From the question we are told that

The wavelength is $\lambda = 2780 nm = 2780 *10^{-9} \ m$

The energy is $E = 80 mJ = 80 *10^{-3} \ J$

This energy is mathematically represented as

$E = \frac{n * h * c }{\lambda }$

Where c is the speed of light with a value $c = 3.0 *10^{8} \ m/s$

h is the Planck's constant with the value $h = 6.626 *10^{-34} \ J \cdot s$

n is the number of pulses

$n = \frac{E * \lambda }{h * c }$

substituting values

$n = \frac{80 *10^{-3} * 2780 *10^{-9}}{6.626 *10^{-34} * 3.0 *10^{8} }$

$n = 1.119 *10^{18} \ photons$

Given that the pulses where emitted 20 times in one second then the period of the pulse is

$T = \frac{1}{20}$

$T = 0.05 \ s$

Hence the average power of photons in one 80-mJ pulse during 1 s is mathematically represented as

$P = \frac{E}{T}$

substituting values

$P = \frac{ 80 *10^{-3}}{0.05}$

$P = 1.6 \ W$

6 0

3 years ago

Jim Abbott was drafted ________ overall in the first round of the 1989 draft.

Rom4ik [11]

The answer is "eighth". And he was drafted in 1988 not 1989.

7 0

3 years ago

Read 2 more answers

The pitch of a sound wave refers to the loudness of a wave. True False

Charra [1.4K]

False it refers to frequency

6 0

3 years ago

Read 2 more answers

Predict the magnitude of the gravitational force....

Galina-37 [17]

Answer:

a=650.549

b=246.4819

c=38.5261

Explanation:

7 0

2 years ago