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

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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Answer: B) Petroleum is limited in supply

Explanation: Have a Great day!!

Answer:

Motion energy, or energy of motion

Explanation:

Answer:

Kinetic Energy is the energy of movement

Explanation:

Answer:

The Summer Solstice

Explanation:

Hope it helped!

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.

Answer:

Option A

Explanation:

since the woman pushed on the door, the door pushes back on the girl's hand since every action has an equal and opposite reaction.

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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:

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

Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

W = F × d

Where F is force applied or Weight and d is distance

Also Force = Weight = mass × acceleration due to gravity.

Since gravity is acting on the boxes as it been lift

W = Weight × height from ground level

W = mg × d

Where m is mass of the boxes, g is accelration due to gravity( g = 9.8m/s² ) and d is distance from ground level.

Given the data in the question;

To determine the work done, we substitute our values into the expression above.

W = mg × d

W = 2722.05kg × 9.8m/s² × 6.0m

W = 160056.5kgm²/s²

W = 160056.5J

W = 1.6 × 10⁵J

Therefore,  Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

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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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Answer:

a c d the correct ....

Explanation:

...........

Answer:

Weather situations can be prepared for in many cases,

Explanation:

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:

They would attract

          but

like charges will repel

Explanation:

HOPE THI HELPS **

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.

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

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

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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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:

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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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:

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.

Answer:

See below

Explanation:

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

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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