15. A ruby-throated hummingbird beats its wings at a rate of about 70 wing beats per
second.
What is the frequency in Hertz of the sound wave?
b. Assuming the sound wave moves with a velocity of 350 m/s, what is the
wavelength of the wave?
U
E

Answer:

Weather situations can be prepared for in many cases,

Explanation:

Block 4 shows the greatest rise in temperature. The rise in the temperature is inversely proportional to the initial length. The concept of thermal expansion is used in the given problem.

Thermal expansion is the tendency of matter to alter its form, area, volume, and density in response to a change in temperature.

The formula for the thermal expansion is found as;

[tex]\rm \triangle L = L \alpha \triangle T \\\\\ \triangle T = \frac{\triangle L}{L\alpha}[/tex]

The rise in the temperature is inversely proportional to the initial length;

Block 4 has the smallest initial length.

Hence, the block 4 has the greatest rise in temperature.

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Answer:

C. Post your goals in an obvious place

Explanation:

Being able to look at your goals and check in on the progress of those goals in a place you know where they are so there's no worrying if you might have forgotten one or two and or havent done them is a good way to stay active and keep motivated with your goals. Making notes or specifications on those goals and trying to think over goals is also something you should do. Ignoring or forgetting your goals because you didnt write them down or put them in a secure place can ruin motivation and make you tired cause keeping track of those goals become a chore.

The magnitude of the change in momentum of the block between zero and 4. 0 seconds is

dp=1.6m/s

Generally, the equation for the kinematics equation is mathematically given as

x=x+ut+0.5at^2

Therefore

1.6=0+0+0.5*a*1^2

a=0.2m/s^2

In conclusion,  change in momentum

dP=mv-mu

2.0*0.8-0

dp=1.6m/s

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Answer:

A, The same amount of gravity

Explanation:

If an object goes through a chemical reaction, but does not change in mass, that object has the same amount of gravity.

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Chemical reaction include changes in color, temperature, the production of light, changes in odor, and the formation of gases.

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The resulting change in momentum of the system will be +18.6 Ns. The momentum is conserved.

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

m is the mass =6.0 kg

t is the time interval=2 second

From Newton's second law;

[tex]\rm \triangle P =m \triangle V \\\\ \triangle P= m(\frac{\triangle x}{\triangle t} )\\\\[/tex]

From the graph;

[tex]\rm \triangle t = 2sec\\\\ \triangle x = (12-8) m[/tex]

The change in the momentum is;

[tex]\rm \triangle P = m\tr(\frac{v-u}{t}) \\\\ \triangle P =9.3 \times \frac{12-8}{2} \\\\ \triangle P= +18.6 \ N.s[/tex]

Hence, the resulting change in momentum of the system will be +18.6 Ns.

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Hi!The speed of a wave is a product of its wavelength and frequency. Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa. This relationship is represented by the equation: Speed = Wavelength × Frequency.

Explanation:

potential energy is the energy of the position of the object whereas kkinetic energy is the energy of the motion of the object

Answer:

Spheres

Explanation:

Points charges are the collection of charges which are located very large distance from each other.

Now as they are approximately equidistant like radius of circle or spheres they are to be spherical.

Answer:

8.45 w

Explanation:

Power = i^2 r

            1.3 ^2 * 5 = 8.45 watts

Answer: B) Petroleum is limited in supply

Explanation: Have a Great day!!

Answer:

36 watts

Explanation:

Power = V I

          = 9 * 4 = 36 watts

Answer:

P = 36 W

Explanation:

Given that,

→ Potential difference (V) = 9 V

→ Current (I) = 4 A

→ Power (W) = ?

Formula we use,

→ P = V × I

Let's solve the problem,

→ P = V × I

→ P = 9 × 4

→ [ P = 36 ]

Hence, the power is 36 watts.

Answer:

T

Explanation:

Hard to know when the wind will blow .

The principal limitation of wind power is unpredictability. this statement is very much true.

In order to produce electricity, wind turbines are mostly used in wind power as well as wind energy. In comparison to burning fossil fuels, wind energy is a well-liked, environmentally friendly, renewable energy source.

Although weather forecasting has become more accurate over time, it is still challenging to anticipate how much and when wind will blow where and when it will. Even though some regions are known to experience more wind than the others, there is currently no way to predict that however much wind here will be because of the inconsistent nature of weather patterns.

Therefore, the given statement is true.

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Your question is incomplete but most probably your full question was,  

The principal limitation of wind power is unpredictability. Please select the best answer from the choices provided

a. True

b. False

Answer:

See below

Explanation:

Heat makes the concrete expand...this expansion causes the concrete to buckle up to make room for the expanded volume

A 70 kg skydiver experiences 371 N of air resistance during her skydive the acceleration is 5.3 m/s². The correct option is A.

Using Newton's second rule of motion, we can calculate the skydiver's acceleration:

F = m x a.

Here,

F = the force (371 N, air resistance in this case)

m = mass of the skydiver (70 kg)

a = acceleration

So, we can write,

[tex]a=\frac{F}{m}[/tex]

Substituting the values,

[tex]a = 371\div 70[/tex]

a = 5.3 m/s².

Thus, the correct option is A.

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If the fundamental frequency or first harmonic of the sound is 200 Hz, the next frequency will be third harmonic and it is 600 Hz.

This is the lowest frequency at which a maximum in the sound level can be heard.

First harmonic of a closed pipe, f₀ = v/4L

Third harmonic of a closed pipe, f₃ = 3v/4L = 3f₀

If the fundamental frequency or first harmonic of the sound is 200 Hz, the next frequency will be third harmonic and it is calculated as follows;

f₃ = 3f₀ = 3(200 Hz)

f₃ = 600 Hz

The complete question is below:

Students use a speaker connected to a sine wave generator to project sound waves into the open left end of a tube that is closed on the right end. The speaker is very close to the tube. A sensor is used to measure the pressure differences created by the sound and the results are displayed on a computer. The entire apparatus is in a sealed chamber that can be filled with different gases.

The chamber is now filled with a gas that has an unknown speed of sound. The students find that the lowest frequency at which they can hear a maximum in the sound level is 200 Hz. If the students slowly increase the frequency, what is the next frequency at which the sensor would measure a maximum in the sound level

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Lets se

And

[tex]\\ \rm\Rrightarrow T=2\pi\sqrt{\dfrac{m}{k}}[/tex]

[tex]\\ \rm\Rrightarrow \sqrt{k}T=2\pi\sqrt{m}[/tex]

So

[tex]\\ \rm\Rrightarrow k\propto m[/tex]

If spring constant is doubled mass must be doubled

By the use of Ohm's law, the resistance of the bulb is 121 ohms

Let us recall that power is the rate of doing work. Now we know that the voltage of the power source is 110-V and the power is 100-W.

Since;

P= IV

I = P/V

I = 100/110

I = 0.91 A

Again;

V= IR

R = V/I

R = 110/0.91

R = 121 ohms

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Answer:

1200 Joules

Explanation:

PE = mgh

PE = 60 * 10 * 2

PE = 1200 Joules

The gravitational potential energy stored in a [tex]60 Kg[/tex] boy sitting at the top of a [tex]2 m[/tex] high slide is [tex]1200 J[/tex].

Potential energy is the energy possessed by a body by virtue of its position relative to others.

[tex]U = mgh[/tex]

Where,

[tex]U =[/tex] potential energy

[tex]m =[/tex] mass

[tex]h =[/tex] height

[tex]g =[/tex] acceleration due to gravity

It represents the potential an object has to do work as a result of being located at a particular position in a gravitational field.

The energy that a ball has when placed at a top of a steep hill while it is about to roll down is an example of potential energy.

Given:

[tex]m = 60 Kg[/tex]

[tex]h = 2m[/tex]

Potential energy is

[tex]U = mgh\\U = 60*10*2\\U = 1200 J[/tex]

Potential energy is [tex]U = 1200 J[/tex]

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Answer:

The Summer Solstice

Explanation:

Hope it helped!

Answer:

Motion energy, or energy of motion

Explanation:

Answer:

Kinetic Energy is the energy of movement

Explanation:

Answer:

Biconcave lens or Diverging lens.

Virtual Image

0.75cm on the same side as the object.

Explanation:

Biconcave lens. Biconcave lenses form all images at the same side as the object. Although a biconvex lens can exhibit the same phenomena, it only occurs when the object is in between the focal point and the optical center (object distance<focal length). From the given parameters, the object distance is 3cm and the which is obviously greater than the focal length.

So, we conclude that the lens used is a biconcave lens.

A concave lens (biconcave, plano-convex,) alway produces a virtual image.

Let u, v and f represent the object distance, image distance and focal length of the lens respectively.

In this case,

u = 3cm

v = ?

f = -1cm ( f is negative for diverging lenses)

1/f = (1/u) + (1/v)

-1 = (1/3) + (1/v)

v = -3/4cm = -0.75 cm

The negative sign means that it's a virtual image.

Answer:

296.1N

Explanation:

The formula for force of gravity is GMm/r^2, where G is the gravitational constant, M is mass object A, m is mass object B and r is distance from the CENTER of object A to object B. First, lets solve GMm. G*5.97*10^24*251=1*10^17

Now lets solve for r:

r=(Re+r)=(6.38*10^6+1.2*10^4)

While it makes sense, distance of the sattelite is in Kilometers, and we need it in meters, so:

r=(Re+r)=(6.38*10^6+1.2*10^4*1000)=18380000

now to the solving:

1*10^17/18380000^2=296.1N

Answer:

They would attract

          but

like charges will repel

Explanation:

HOPE THI HELPS **

Answer:

15 m

Explanation:

Given,

Mass ( m ) = 75 kg

Potential energy ( P.E ) = 11,025 J

To find : Hight ( h )

Formula : -

P.E = mgh

[ Note : The value of g = 9.8 m/s² ]

h = P.E / mg

  = 11,025 / ( 75 x 9.8 )

  = 11,025 / 735

h = 15 m

Hence,

15 m is the high off the ground must you be if you mass is 75 kg and you have 11,025 J of energy stored inside.