What does the "coefficient of friction" tell you?

Explanation:

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .

Explanation:

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .

Answer:

he string has POTENTIAL ELASTIC energy

Explanation:

he catapult is a very good example of energy transformations.

Initially when the string is taut it has an elastic potential energy, when releasing the lever it is transformed into cinetic energy in the ball until it shoots out.

Consequently the string has POTENTIAL ELASTIC energy

Answer:

The answer is elastic

TRUST ME

Explanation:

Answer: acceleration is time derivative of speed.

When v(t) = 60 + 0.50t, is a(t) = v' (t) = 0.50 (m/s²)

Iron ( Fe ) is a micro element that is essential for the formation of haemoglobin.

Hemoglobin has two components-

Answer:h I think

Explanation:

Answer:

R = 24 cm

Explanation:

Given that,

A spherical mirror used in solar furnace focuses sunlight on its principal axis at a distance 12 cm from its pole. It means the focal length of the mirror is equal to 12 cm

We need to find the radius of curvature of the mirror. Let it is R. We know that the relation between radius of curvature and the focal length is given by :

R = 2f

So,

[tex]R=2\times 12\\\\=24\ cm[/tex]

So, the radius of curvature of the mirror is equal to 24 cm.

The FIRST statement on the list is the definition of momentum, so that's the one that must be true.

When two objects A and object B are moving with the same momentum then the product of their velocity and mass will be equal.

The momentum of any object is defined as the product of the mass of the body to the velocity of the body. So if the two bodies are having same momentum it means that the product of their masses and the velocities are equal.

Now suppose the mass and the velocity of the body A is [tex]M_A[/tex] and [tex]V_A[/tex] so the momentum of the body will be given by

[tex]P_A= M_A\times V_A[/tex]

Similarly for body B the mass and the velocity is given as [tex]M_B[/tex] and [tex]V_B[/tex] then the momentum of the body B will be given as

[tex]P_B=M_B\times V_B[/tex]

So now both body A and B are having same momentum then

[tex]P_A=P_B[/tex]

[tex]M_A\times V_A=M_B\times V_B[/tex]

Thus when two objects A and object B are moving with the same momentum then the product of their velocity and mass will be equal.

To know more about momentum follow

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Answer:

[tex]a=\dfrac{v-u}{t}[/tex]

Explanation:

The acceleration of an object is the rate of change of velocity. The mathematical expression for the acceleration of an object is given by :

[tex]a=\dfrac{v-u}{t}[/tex]

Where

v and u are final and initial velocities

t is time

or we can write acceleration as :

[tex]a=\dfrac{\Delta v}{\Delta t}[/tex]

Hence, this is the required solution.

Answer:

=140 cm²

Explanation:

1

____ ×20x 14

2

=1

___ x base × height

is the formula have a gr8 day :)

2

+10m/s²--25m/s

Explanation:

it's downward acceleration is +10ms-²

since it is falling freely under the influence of gravity

Since the elevator drops downward, that is initially from rest , u=0

so for this equation S=u + ½at²

but since u is 0 the new equation becomes S=½at²

thus from the new equation we determine the height attained after 2.5s during the fall

substituting 2.5s in the equation...

we get s to be 31.25m

then we substitute s in this equation when u=0 to get the velocity of the body

v²=u²+2as

v²=2as

v²=2(+10•31.25)

v²=625

v=25m/s

i suppose this will help

Answer:

The presumption of 'innocence of defendant'

Explanation:

Prosecution refers to the conduct of legal proceedings against defendant (accused), for a criminal behaviour.

Prosecution has the responsibility to overcome the presumption of innocence of defendant, proving the latter guilty - based on supporting evidences.

Answer:

hsnzbssj

Explanation:

Answer: 40,000kg m/s option c)

Explanation:

Given data

m1= 2000kg

u1= 20m/s

m2= 1500kg

u2= 0m/s

v1= 10m/s

Required

The speed of the sticks

We know that from the expression for the conservation of momentum

m1u1+m2u2= m1v1+m2v2

2000*20+1500*0=2000*10+1500*v2

40000=20000+1500v2

collect like terms

40000-20000= 1500v2

20000= 1500v2

v2= 20000/1500

v2= 13.33 m/s

Hence the velocity of the sticks is 40,000kg m/s

I hope I helped!! ❤️

Answer:

The first is a full moon the second is waxing crescent

Explanation:

Answer:

A

Explanation:

the earth blocks the sunlight and the rest reflects off of the moon

Answer:

v = 24 cm and inverted image

Explanation:

Given that,

The focal length of the object, f = +8 cm

Object distance, u = -12 cm

We need to find the position &nature of the image​. Let v be the image distance. Using lens formula to find it :

[tex]\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}[/tex]

Put all the values,

[tex]\dfrac{1}{v}=\dfrac{1}{f}+\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{8}+\dfrac{1}{(-12)}\\\\v=24\ cm[/tex]

So, the image distance from the lens is 24 cm.

Magnification,

[tex]m=\dfrac{v}{u}\\\\m=\dfrac{24}{-12}\\\\m=-2[/tex]

The negative sign of magnification shows that the formed image is inverted.

Answer:

0.19 and 0.45

Explanation:

edge

The first and second velocities of the car are [tex]0.25/t_1[/tex] and [tex]0.50/t_2[/tex]respectively.

The velocity of an object is defined as the product of the distance travelled in a given direction and the time required to travel that distance. The velocity is expressed mathematically as,

v = d/t

Here, d represents the travelled distance.

And t is the typical amount of time needed to go the distance.

Given,

The value of the first distance is, d1 = 0.25 m.

The value of the second distance is, d2 = 0.50 m.

Then the first velocity of the car at 0.25 m is,

[tex]v_1 = d_1/t_1\\v_1 = 0.25 / t_1[/tex]

Thus,[tex]t_1[/tex] denotes the first distance's typical time.

The second velocity of the car with three washers at the 0. 50 m mark is

[tex]v_2 = d_2/t_2\\v_2 = 0.50 /t_2[/tex]

Here, [tex]t_2[/tex] stands for the second distance's typical time.

Thus, the first and second velocities of the car are [tex]0.25/t_1[/tex] and [tex]0.50/t_2[/tex]respectively.

Learn more about Velocity, here:

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Answer:

i don't understand the hw

Answer:

I think it's B

Explanation:

sorry if im wrong

Answer:

it will decrease speed

Explanation:

Answer:

it's b

Explanation:

Answer:

But in MIT's Media Lab, everyone has a fair shot, thanks to a camera that alerts the lab when there's free food. Called the Foodcam, it features a camera that beams a photo of the leftovers to the entire lab, creators Will Glesnes and Jon Ferguson, tell Tech Insider.

Answer:

PRESSURE is a force exerted by the substance per unit area on another substance.

The key difference between water pressure and air pressure is that one is made up of water and the other is made up of air. Both air pressure and water pressure are based on and follow the same physical principals.

Explanation:

Answer:

B. 6

Explanation:

i think... im in 7th grade and haven't really leaned this but im like 60% sure but i migjt be wrong

Answer:

your answer is B 6 protons

Explanation:

since the atomic number for carbon is 6 it also represents the number of protons and electrons

Answer:

Explanation:

Quantum theory has taught us that virtually everything to do with the nature of matter in the universe is a random process. The decay of atomic nuclei is something that makes that randomness "visible" with appropriate instrumentation. As such, the rate of decay will vary over the "short" term. Consequently, it is not surprising to see a variation of a few counts in an activity measurement over a period of a few minutes.

__

Safety with respect to radioactive materials involves staying as far away from them as possible. The use of long tongs for handling would be appropriate.

Answer:

↔ for safety precautions the scientist should used this upon working with radioactive materials in a laboratory.

Answer:

germ cleaning

and getting up cooking grease

Explanation:

Answer:

f=ma

Explanation:

Answer:

F = m * a

Explanation:

2nd law of motion

Answer:

10.6 s

Explanation:

Given that a girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?

Solution.

If she accelerated for 7s, the velocity at which she accelerated will be:

Acceleration = velocity/time

8 = V/7

Make V the subject of the formula by cross multiplying.

V = 8 × 7

V = 56 m/s

She maintains the speed through out the journey.

Speed = distance/time

Make time the subject of formula

Time = distance/speed

Time = 200 / 56

Time = 3.57s

Therefore, she will complete the race by 7 + 3.6 = 10.6 s

Answer:

I think it is protection

Answer:

I think it might be PROTECTION but i not sure for a fact

Sorry if i get it wrong ;]

Explanation:

Answer:

They do that by converting rotating mechanical energy into electrical power. Portable generators use an engine—typically running on gasoline, diesel, or propane, to turn an alternator which produces alternating electrical current or AC.