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Answer:

The  cross-sectional  area is [tex]A = 7.59 *10^{-11} \  m^2[/tex]

Explanation:

From the question we are told that

   The dimension of the cell is    6.9 × 10-4 cm by 1.1 × 10-3 cm = [tex]6.9*10^{-6} \ m \ by\  1.1*10^{-5} \  m[/tex]

   Generally the cross-sectional area is mathematically represented  as

    [tex]A  =  6.9*10^{-6}   *  1.1*10^{-5}[/tex]

=>   [tex]A = 7.59 *10^{-11} \  m^2[/tex]

Answer:ME= 1\2mv^2 + mgh

Explanation: I hope this helped.

The correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R. Negative sign appears as gravitational force is attractive force.

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases.

If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy. It is capable of performing more work when raised.

Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has more potential energy as they become further apart.

Potential energy of a system of particles can be represented as summation of individual's  potential energy. Hence, the correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R.

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Answer:

Explanation:

A force is any action that tends to alter the state of rest or uniform motion motion of a body. This is essentially Newton's first Law of motion. Energy is a property of a system that is a measure of the capacity to do work. for example Potential, kinetic

Hope this helps!

k = f/x

x = f/k

( / means divide )

The equation connecting force and the displacement  k is F= k x. From the spring constant k can be found by dividing F by x and similar to get x by dividing F by k.

Force is an external agent acting on a body to change it from the state of motion or rest. There are various kinds of force namely magnetic force, frictional force, gravitational force etc.

Force applied on a body if result in displacement of the body it is said to work done on the body. An elastic body like  a spring can be stretched or compressed by applying a force on it. Let the change in length or displacement of the elastic body be x.

Then, the force applied on it to make the displacement x is directly proportional to x.

F = k x, where k is the proportionality constant here called the spring constant.

From this the spring constant k = F/x

Similarly, if we know the force f and spring constant k, then x = F/k.

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Answer:

(a). Work done is the physical quantity which is same for both boys.

(b).Power is the physical quantity which is different for both boys.

The ratio of power of both boys is 2:1

Explanation:

Given that,

Time of boy A= 30 min

Time of boy B = 60 min

(a), We need to find the physical quantity that is same for both boys

Using given that,

We know that,

Work done depends on the force and displacement.

Here, force and displacement is same for both boys.

So, we can say that the work done will be same for both boys.

(b).  We need to find the physical quantity that is different for both boys

Using given that,

We know that,

Power is equal to the work done divided by time.

Time is different for both boys so, the power will be different for both boys.

We need to calculate the ratio of power of both boys

Using formula of power

[tex]P=\dfrac{W}{t}[/tex]

Put the value into the formula

For boy A,

[tex]P_{A}=\dfrac{W_{A}}{t_{A}}[/tex]....(I)

For boy B,

[tex]P_{B}=\dfrac{W_{B}}{t_{B}}[/tex]....(II)

From equation (I) and (II)

[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{\dfrac{W}{30}}{\dfrac{W}{60}}[/tex]

[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{60}{30}[/tex]

[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{2}{1}[/tex]

Hence, (a). Work done is the physical quantity which is same for both boys.

(b).Power is the physical quantity which is different for both boys.

The ratio of power of both boys is 2:1

Answer:

false

Explanation:

it's hydrogen. also hydrogen has one proton and stuff and helium two

The number of protons in an atom is known as the atomic number

Answer:

Number of protons

Explanation:

It is denoted by the letter Z

Answer:

An airplane is flying at an airspeed of 200 miles per hour headed on a SE bearing of 140°. A north wind (from north to south) is blowing at 16.2 miles per hour, as shown in Figure 8.8.1. What are the ground speed and actual bearing of the plane?

Explanation:

plss brainlieist me

θ = 205° - 105° = 100°

[tex]\tt R=\sqrt{L^2+M^2+2LMcos\theta}\\\\R=\sqrt{303^2+555^2+2.303.555cos100}\\\\R=584.32~m[/tex]

Answer:

hope it helps you:)

Explanation:

mark me brainliest

Answer:

1) Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.

Explanation:

Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.

In orbital mechanics and aerospace engineering, a gravitational slingshot is the use of the motion of a planet to alter the path and speed of an interplanetary spacecraft.

Given is to find the major division between -

Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.

Therefore, we can conclude that -

Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.

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Hi there!

We can use the power equation:
[tex]P = \frac{V^2}{R}[/tex]

P = Power (W)
V = Potential Difference (V)
R = Resistance (Ω)

Rearrange to solve for Resistance:
[tex]R = \frac{V^2}{P} = \frac{220^2}{1477} = \boxed{32.769 \Omega}[/tex]

Answer:

Becky gave her friend 42 Oreos

Explanation:

55-13=42

Answer:

42

Explanation: 55-13 = 42

Answer:

1.98 kg/m

Explanation:

5.94 divided by 3.00

Answer:

11.04m

Explanation:

Convert kilometers to meters: 53km/h x 1000 = 53,000m/h

Convert hours to seconds: 53m/h / 3600 =14.72m/s

14.72 (.75) = 11.04

Answer:

it means the velocity is changing.

the rate of change of velocity is acceleration

so it means the body is accelerated at 2m/s^2

It means that the body is moving, and getting faster and faster. At any time, it's moving 2 m/s faster than it was moving 1 second earlier.

I think the answer is B true

the initial kinetic energy is equal to the final kinetic energy

Answer:

4kg=4000,8m=60 times 8 =480

4000 times 480 over 100 =19200

Answer:

The great thing about exercise is that it’s never too soon or too late to start. Fitness can support healthy growth and development in children and reduce the risk of cognitive decline and delay the onset of dementia in older people. You don’t have to join a gym or spend lots of money on equipment to get fit.

Explanation:

Answer:

Strong nuclear force

Explanation:

Answer:

Attraction property of magnets!

Explanation:

Good luck on your test or question :)

Answer:

this is the answer

Answer:

False

Explanation:

they just what they spent money on and thats not all of it

Answer: B

Explanation: efficiency is the useful energy supplied; useful energy supplied doesn't not change,
work done stays constant

in order to to increase the power of the motor, time would have to be decreased to get the wanted result..

When he  increases the input power to the motor and repeats the experiment, work done stays the same but time taken decreases.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft.

To lift a load through a vertical distance of 2.0m, in the both cases same amount of work-done happens because the displacement is same.

But as the input power, in second case, increases but the efficiency of the motor does not change, the time taken decreases ( as time taken = work done/power)

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The net force is 0 because the friction force counteracts or counterbalances the force you apply, which is why the object does not move. Specifically the static friction is holding the object in place and keeping the object static.

Once you apply enough force and overcome that static friction, then the object will move and you'll be dealing with dynamic friction. Dynamic friction is what still holds the object back somewhat and allows the object to slow down and eventually stop (when the force you apply isn't enough anymore).

Without dynamic friction, the object would slide forever until it hit the wall. With something like slippery ice, there is dynamic friction but it's not as large compared to other surfaces.

Answer:

Renewable sources are better because they don't damage the environment. As of now, there is a r=lot of damage already done to the environment thanks to non-renewable resources, and soon a lot of this damage will be irreversible. Another good thing about renewable resources is that that it is unlimited, this means that it is a steady source of energy and items.

Non renewable resources are good for the economy. People are so used to using non renewable resources that they might not want to switch over to renewable resources. People will keep buying these product so it is a steady item to invest in and profit off of. Non renewable resources also have a lot  more research on them and people have found multiple different ways to utilize it so people might like it more.

Answer:

8.6N

Explanation:

We use the eq

F=ma

By putting values

F=.43×20

F=8.6N