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3 years ago

A bird is traveling west with a velocity of 8 m/s and momentum of 40 mg*m/s what's the birds mass?

Physics

1 answer:

VikaD [51]3 years ago

3 0

Answer:

m = 5 [mg]

Explanation:

We must remember that the definition of linear momemtum is defined as the product of mass by distance.

P = m*v

P = momentum = 40 [mg*m/s]

m = mass [mg]

v = velocity = 8 [m/s]

Now clearing m:

m = P/v

m = 40/8

m = 5 [mg]

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Large electric fields in cell membranes cause ions to move through the cell wall. The field strength in a typical membrane is 1.

BlackZzzverrR [31]

1) Magnitude of the force: $1.6\cdot 10^{-12} N$

The magnitude of the electric force on an electric charge is:

$F=qE$

where q is the charge and E the electric field. In this problem:

$q = +e = +1.6\cdot 10^{-19} C$ is the charge of the calcium ion

$E=1.0 \cdot 10^7 N/C$ is the magnitude of the electric field

Substituting,

$F=(1.6\cdot 10^{-19}C)(1.0\cdot 10^7 N/C)=1.6\cdot 10^{-12} N$

2) Acceleration: $2.5\cdot 10^{13} m/s^2$

The atomic mass of a calcium ion is approx. 40 a.m.u, this means that its mass is

$m=40 \cdot (1.6\cdot 10^{-27}kg)=6.4\cdot 10^{-26} kg$

And so, the acceleration of the ion is given by Newton's second law:

$a=\frac{F}{m}=\frac{1.6\cdot 10^{-12}N}{6.4\cdot 10^{-26} kg}=2.5\cdot 10^{13} m/s^2$

3) Yes

Explanation: a particle with same charge (+e) of the calcium ion could have the same acceleration of the calcium ion if it has exactly the same mass. In fact, the acceleration depends only on two factors: the mass and the force, so it both are the same, than the acceleration does not change.

4) The mass of the particle

In fact, the acceleration of the particle is given by:

$a=\frac{F}{m}$

where F is the electric force and m the mass. Therefore, if the mass changes ,the acceleration changes as well.

4 0

3 years ago

A certain airport runway of length L allows planes to

PilotLPTM [1.2K]

The length of the new runway In terms of (L) is 4L.

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<em>Your question is incomplete, it seems your question is missing the following information below;</em>

"In terms of (L) , what must be the length of the new runway?"

The given parameters;

length of the runway, = L

let the take off speed = V₁

For the newly designed planes;

the take off speed is double of the original = 2V₁

the acceleration for both take is constant = a

The take off speed for the given constant acceleration is given as;

$v^2 = u^2 + 2as\\\\v^2 = 0 + 2as\\\\v^2 = 2as\\\\a = \frac{v^2}{2s} \\\\$

The length of the new runway In terms of (L) is calculated as follows;

$a = \frac{v_1^2}{2s_1} = \frac{v_2^2}{2s_2} \\\\substitute \ the \ corresponding \ values \ for \ initial \ acceleration \ and \ new \\acceleration\\\\\frac{v_1^2}{2L} = \frac{(2v_1)^2}{2s_2}\\\\2s_2v_1^2 = 2L(4v_1^2)\\\\s_2 = \frac{2L(4v_1^2)}{2v_1^2} = \frac{8Lv_1^2}{2v_1^2} = 4L$

Thus, the length of the new runway In terms of (L) is 4L.

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3 years ago

Please help!!

drek231 [11]

Answer:

Mass of body A, m

Mass of body B, m

Height h

=2h

Acceleration due to gravity, g

PotentialEnergy(P.E

)

PotentialEnergy(P.E

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P.E=mgh

⇒P.Eαh

(∴ 'm' and 'g' are constants)

⇒

P.E

⇒

P.E

⇒

P.E

Therefore, the ratio of potential energy is of the two bodies is 1 : 2.

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3 years ago

What two factors exert the greatest influence over a terrestrial biome?

Elena-2011 [213]

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4 years ago

Your car burns gasoline as you drive up a large mountain. What energy transformation is the car performing?

Sonja [21]

Your car is performing a transformation of energy of:

Chemical energy to Mechanical energy

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3 years ago

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