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3 years ago

Carole is very tired and makes coffee. why would newton say that she must use her hand to put up the cup

Physics

2 answers:

QveST [7]3 years ago

8 0

The answer is B) An object at rest will stay in at rest unless acted upon by an external force

Marat540 [252]3 years ago

5 0

newton say that she must use her hand to put up the cup because the work is equal to force times it distance, that is in the same direction of the force applied. if carole used her hand to put up the cup, then he is not applying any work because the displacement is not in the same direction of the force

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After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work. What type of circuit

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Answer:

Explanation:

a parallel circuit because there is more than one path

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3 years ago

1. Traditionally, only parties to a contract had rights and liabilities under the contract. This was known as the principle of _

Sladkaya [172]

Answer:

Privity of contract, Assignment

Explanation:

Privity of contract is the relationship that exist between the parties to a contract which allows them to sue each other meanwhile it prevents a third party from doing so. It is a common law principle which provides that a contract cannot confer rights or impose obligations upon any person who is not a part to the contract.

Assignment: This is the act of transferring all or part of one's rights arising under a contract to another another person.

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3 years ago

why did scientists using classical, newtonian physics have difficulty explaining the photoelectric effect

zzz [600]

The correct answer is :

According to classical electrodynamics, light energy is a wave that is absorbed by atoms in a manner similar to how an object absorbs radiant heat. So, the atoms of a metal would absorb more energy the brighter the light was. It would be feasible for an electron in a metal to break free from its atoms if it received enough energy from the incoming wave. The more energy absorbed, the more energetic the metal's released electrons would be. Additionally, no electrons could conceivably be ejected until each atom had enough light energy. Light intensity was far more important than light frequency.

In many respects, the photo-electric effect contradicted this strategy:

If the light was below a specific frequency, no matter how bright it was, no electrons were released. Increased light intensity increased the number of electrons that were released, but not their energy, if the light was above this frequency.
Regardless of how weak the light was, electrons were nearly immediately emitted from the metal.
Even though the intensity of the light was reduced, an increase in its frequency led to more energising electrons leaving the metal.

To learn more about photo-electric effect refer the link:

brainly.com/question/25630303

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1 year ago

A shuffleboard player pushes a 0.25 kg puck, initially at rest, such that a constant horizontal force of 6 N acts on it through

AveGali [126]

Answer:

(a) 3 J and 4.899 m/s

(b) -3 J.

(c) It will take four times as much as the work done to stop it when the final speed is increased twice.

Explanation:

(a) Work done by the shuffleboard player = Force × distance

W = F×d.................................. Equation 1

Where W = work done, F = Force, d = distance.

Kinetic Energy (Ek) of the = 1/2mv²...................... Equation 2

Where m = mass of the puck, v = velocity of the puck.

Note: Work done by the shuffleboard player = Kinetic Energy of the puck when the force is removed, assuming no energy is lost to friction.

Therefore,

Ek = 1/2mv² = F×d

Ek = F×d ............................................. Equation 3

Given: F = 6 N, d = 0.5 m.

Substituting these values into equation 3

Ek = 6×0.5

Ek = 3 J.

Thus the kinetic Energy = 3 J.

Also,

Ek = 1/2mv²

making v the subject of the equation

v = √(2Ek/m)....................... Equation 4

Given: m = 0.25, Ek = 3 J

Substituting into equation 4

v = √(2×3/0.25)

v = √24

v = 4.899 m/s

Thus the speed of the puck = 4.899 m/s

(b) The work required to bring the puck to rest = -(the Kinetic Energy of the puck.)

Wₙ = 1/2mv²

Where Wₙ = work required to bring the puck to rest.

Where m = 0.25 kg, v = 4.899 m/s²

Wₙ = -1/2(0.25)(4.899)²

Wₙ = -1/2(0.25)(24)

Wₙ = -0.25(12)

Wₙ = -3 J

Thus the work required to bring the puck to rest = 3 J.

Work required to stop it.

Wₓ = 1/2mv²

Where Wₓ = work required to stop the puck when it has twice the final speed.

m = 0.25 kg, v = 9.798 m/s ( twice the final speed)

Wₓ = 1/2(0.25)(9.798)²

Wₓ = 1/2(0.25)(96)

Wₓ = 12 J.

Thus the puck will take four times as much as the work done to stop it when the final speed is increased twice.

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3 years ago

Given the following steps: 1. voltage gated potassium channels close; 2. threshold; 3. undershoot; 4. stimulus channels open; 5.

yanalaym [24]

Answer:

4, 2, 5, 3, 1

Explanation:

The neuron remains at RMP unless stimulated. The stimulus results in opening of stimulus channels, this causes depolarization. if the extent of depolarization reaches to the level of threshold, the sodium and potassium channels begin opening but potassium channels are slow to open. Hence at first sodium goes out causing further depolarization until it reaches the peak at which the potassium channels open and the sodium channels close. This causes the potassium to rush our causing repolarization i.e. return of the membrane potential to RMP but the potassium channels are slow to close and it leads to hyperpolarization (undershoot) making the membrane potential more negative due to excessive movement of potassium outside the cell. Once the potassium channels close, the leak channels and Na K pump acts to return the potential to RMP.

Explanation:

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3 years ago