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3 years ago

A rower in a boat pushes the water using an oar.

Physics

2 answers:

brilliants [131]3 years ago

6 0

Answer:

It's B, because of process of elimination:

A: The rower would be applying force to the oar not the other way around. So that's immediately out.

C: If the force of the oar applies to the water, the force of the water cannot apply to the oar.

D: Same as why A is incorrect.

So B is the only one left.

solong [7]3 years ago

6 0

The correct answer is B. “Every action has an equal or opposite reaction”.

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Which of the following factors affect the pressure of an enclosed gas?

dimulka [17.4K]

Answer:

D. All of the above.

Explanation:

PV=nRT

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3 years ago

Albert's laboratory is filled with a constant uniform magnetic field pointing straight up. Albert throws some charges into this

guajiro [1.7K]

Answer:

$\vec{F}=qB(v_y \hat{i} - v_x\hat{j})$

Explanation:

The force excerted by a magnetic field on a charged particle is given by the Lorentz force:

$\vec{F} = q \vec{v} \times \vec{B}$

Lets consider the z-direction of our coordinate system the same direction of the magnetic field, that is:

$\vec{B} = B \hat{k}$

Let us consider that the velocity of a given particle is:

$\vec{v} = v_x\hat{i} + v_y \hat{j} + v_z \hat{k}$

Therefore, since k×k = 0

$\vec{v} \times \vec{B} = (v_x\hat{i} + v_y \hat{j} + v_z \hat{k}) \times B\hat{k}\\\vec{v} \times \vec{B} = (Bv_x \hat{i} \times\hat{k}) + (Bv_y \hat{j}\times\hat{k})$

And since i, j , k are a rigth hand system:

i × j = k

j × k = i

k × i = j --> i × k= -j

$\vec{v} \times \vec{B} = Bv_x (-\hat{j}) + Bv_y \hat{i} = Bv_y \hat{i} - Bv_x\hat{j}$

Threfore, if the particle has charge q and velocity v = (vx,vy,vz), the magnetic force it will feel will be

$\vec{F}=qB(v_y \hat{i} - v_x\hat{j})$

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3 years ago

16. PHYSICS The height h of a falling object is given by h = vt - gt2, where vis the initial velocity of the object, t is time,

disa [49]

The value of v; initial velocity is determined as, v = h/t + gt.

<h3>What is initial velocity of an object?</h3>

The initial velocity of an object is the velocity of the object before the effect of acceleration, which causes the change of velocity.

h = vt - gt²

to solve for v (the initial velocity) we will make v the subject of the formula.

h + gt² = vt

divide both sides of the equation by t

h/t + gt = v

Thus, the value of v; initial velocity is determined as, v = h/t + gt.

Learn more about initial velocity here: brainly.com/question/19365526

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2 years ago

How do i solve for the point of equigravity between two planets, given their mass ratio and the distance between them ?

Dennis_Churaev [7]

The equigravity between two planets is determined from the product and their masses and square of distance between them.

<h3>Gravitational force between two planets</h3>

The gravitational force between two planets is calculated as follows;

F = GM₁M₂/R²

where;

G is universal gravitation constant
M₁ is mass of first planet
M₂ is mass of the second planet
R is the distance between the two planets

Use the mass ratio of the two planets to determine their individual masses.

Thus, the equigravity between two planets is determined from the product and their masses and square of distance between them.

Learn more about gravitational force here: brainly.com/question/72250

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2 years ago

What is the scientific method

Alex_Xolod [135]

The scientific method is an empirical tool that can be used to study phenomenon by asking questions, conducting experiments, and making observations to prove or disprove hypotheses. The scientific method has been used as a baseline tool in hard and social sciences to conduct experiments and to make conclusions about phenomenon in our natural world.

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3 years ago

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