A wave has a wavelength of 13 mm and a frequency of 18 hertz. What is its speed?

If a species experiences a helpful mutation, like camouflage, explain how that mutation would help the species to better survive

ExtremeBDS [4]

Answer:

A helpful mutation like camoflage would immensely help a species survive and flourish. The reason being the appliances of such a mutation. Camoflage is one of the most apllicable of abilities. It can be used as a defense mechanism, to hide in plain sight, it can be used offensively to avoid being seen while hunting and it can even be used as a form of communication between the species. All of these appliances would greatly benefit the species and would most definitely help it survive and flourish.

4 0

3 years ago

he coefficent of static friction between the floor of atruck and a box resting on it is 0.30. The truck is travelingat 80.0 km/h

Vedmedyk [2.9K]

Answer:

83.97 m

Explanation:

Without any other external force causing motion in the horizontal direction, it is the frictional force that brings the box to rest. The frictional force has to match the force due to deceleration experienced by the truck to not move.

So,

Frictional force = ma

Then, we calculate frictional force now,

In the vertical direction, the force balance has the weight and the normal reaction equal

N = W = mg

And frictional force = μN = μmg

where μ is the coefficient of friction = 0.3

ma = μmg

a = μg = 0.3 × 9.8 = 2.94 m/s²

Then, using the equations of motion, we obtain the distance over which this deceleration stops the truck

u = initial velocity of the truck = 80 km/h = 22.22 m/s

v = final velocity of the truck = 0 m/s, since the truck comes to rest

a = - 2.94 m/s² (negative sign because it's a deceleration)

x = distance covered during this deceleration = ?

v² = u² + 2ax

0² = 22.22² + 2(-2.94)(x)

5.88x = 493.73

x = 83.97 m

4 0

3 years ago

Read 2 more answers

1. A note has a wavelength of 0.77955 m. If the speed of sound is 343.00 m/s, what pitch is this note? 2. A note has a wavelengt

AVprozaik [17]

Answer:

1.) 440 Hz

2.) 659.3 Hz

Explanation:

1.) Given parameters are:

wavelength = 0.77955 m.

speed of sound = 343.00 m/s

Frequency = speed/ wavelength

Substitute speed and wavelength into the formula

Frequency = 343/ 0.77955

Frequency = 439.99

Frequency = 440 Hz approximately

2.) The parameters given are:

wavelength = 0.52028 m.

speed of sound = 343.00 m/s

Using the same formula

Frequency = speed/wavelength

Substitute all the parameters into the formula

Frequency = 343 / 0.52028

Frequency = 659.3 Hz approximately

The pitch of a note depends on the frequency of the sound waves.

The pitch of a sound increases as the frequency of the sound waves increases.

5 0

3 years ago

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What’s a NEURON AND HOW DO THEY WORK? EXPLAIN IN UR OWN WORDS

bulgar [2K]

Answer:

The neuron is the basic working unit of the brain, a specialized cell designed to transmit information to other nerve cells, muscle, or gland cells. Neurons are cells within the nervous system that transmit information to other nerve cells, muscle, or gland cells. Most neurons have a cell body, an axon, and dendrites.

7 0

3 years ago

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Two students stand poised to leap off a high dive structure into the swimming pool below. Student B is twice as massive as stude

iogann1982 [59]

Answer: option (D)

Explanation:

The potential energy of each of the students is given below as

P.E(student A) = mgh, where m = mass of student A, g is acceleration due to gravity and h = height of the high dive structure.

The mass of student B is twice as much as that of A, hence his mass is 2m and his potential energy is given below as

P.E ( student B) =2mgh = 2(mgh)

Recall that the relationship between potential energy and work done is that

Work done = - (change in potential)

For student A, work done = - mgh

For student B, work done = - 2mgh

From the equations above it can be seen that student B will do twice the work in getting to the high dive structure than student A hence validating option D.

8 0

3 years ago