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3 years ago

Which of the following best describes reflection?

2 answers:

4 0

B. Reflection is when waves bounce off a surface Ik this because I did it in 7th grade was my favorite unit to learn in school

Hunter-Best [27]3 years ago

3 0

Answer: diffraction

Explanation:

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What is dispersion of light?

algol13

Answer:

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The splitting up of light into its constituent colours while passing from one medium to the other is called dispersion.

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2 years ago

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The lowest note on a grand piano has a frequency of 27.5 Hz. The entire string is 2.00 m long and has a mass of 440g . The vibra

ANEK [815]

Answer:

Tension, T = 2038.09 N

Explanation:

Given that,

Frequency of the lowest note on a grand piano, f = 27.5 Hz

Length of the string, l = 2 m

Mass of the string, m = 440 g = 0.44 kg

Length of the vibrating section of the string is, L = 1.75 m

The frequency of the vibrating string in terms of tension is given by :

$f=\dfrac{1}{2L}\sqrt{\dfrac{T}{\mu}}$

$\mu=\dfrac{m}{l}$

$\mu=\dfrac{0.44}{2}=0.22\ kg/m$

$T=4L^2f\mu$

$T=4\times (1.75)^2\times (27.5)^2 \times 0.22$

T = 2038.09 N

So, the tension in the string is 2038.09 N. Hence, this is the required solution.

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4 years ago

2. What is the speed of a car that travels 73.4 kilometers (km) in 5 hours?

maksim [4K]

Speed =dist./time
=73.4/5
=14.68 km/hr

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3 years ago

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Someone places a chocolate bar near a working radar set that is used to locate ships and airplanes. which best describes what is

hjlf

The chocolate softens and melts as it absorbs the microwaves, and it makes a mess.

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4 years ago

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One chef places a pie in the oven at a low setting so that it is baked in one hour. Another chief place a pie in the oven at a h

KengaRu [80]

In each case, (the pie in a low setting at one hour versus the pie in a high setting at thirty minutes) the amount of energy is the same. However, the amount of power is different. Since power is the amount of work put in certain amount of time, the power in the high setting is larger compared to the power in the low setting.

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3 years ago