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2 years ago

Question 11 (2 points)

Physics

1 answer:

____ [38]2 years ago

7 0

Answer:

Explanation:

Power is defined as the work done per unit time

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When cells use chemical energy obtained from food, this is known as

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It is respiration. Cell burns glucose with oxygen to release energy, along with producing water and carbon dioxide.

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2 years ago

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You are at the controls of a particle accelerator, sending a beam of 2.10×107 m/s protons (mass m) at a gas target of an unknown

Kipish [7]

Answer:

The mass is $m_2 =21.75*10^{-27} \ kg$

The velocity is $v_2 = 3.0*10^{6} m/s$

Explanation:

From the question we are told that

The speed of the protons is $u_1 = 2.10*10^{7} m/s$

The mass of the protons is $m$

The speed of the rebounding protons are $v_1 = -1.80 * 10^{7} \ m/s$

The negative sign shows that it is moving in the opposite direction

Now according to the law of energy conservation mass of one nucleus of the unknown element. is mathematically represented as

$m_2 = [\frac{u_1 -v_1}{u_1 + v_1} ] m_1$

Where $m_1$ is the mass of a single proton

So substituting values

$m_2 = \frac{2.10 *10^{7} - (-1.80 *10^{7})} {(2.10 *10^7) + (-1.80 *10^{7})} m_1$

$m_2 =13 m_1$

The mass of on proton is $m_1 = 1.673 * 10^{-27} \ kg$

So $m_2 =13 ( 1.673 * 10^{-27} )$

$m_2 =21.75*10^{-27} \ kg$

Now according to the law of linear momentum conservation the speed of the unknown nucleus immediately after such a collision is mathematically evaluated as

$m_1 u_1 + m_2u_2 = m_1 v_1 + m_2v_2$

Now $u_2$ because before collision the the nucleus was at rest

$m_1 u_1 = m_1 v_1 + m_2v_2$

=> $v_2 = \frac{m_1(u_1 -v_1)}{m_2}$

Recall that $m_2 =13 m_1$

$v_2 = \frac{m_1(u_1 -v_1)}{13m_1}$

=> $v_2 = \frac{(u_1 -v_1)}{13}$

substituting values

$v_2 = \frac{( 2.10*10^{7} -(-1.80 *10^{7}))}{13}$

$v_2 = 3.0*10^{6} m/s$

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3 years ago

By what angle should the second polarized sheet be rotated relative to the first to reduce the transmitted intensity to one-half

algol [13]

Answer:

θ = 45º

Explanation:

The light that falls on the second polarized is polarized, therefore it is governed by the law of Maluz

I = I₀ cos² θ

in the problem they ask us

I = ½ I₀

let's look for the angles

½ I₀ = I₀ cos² θ

cos θ = √ ½ = 0.707

θ = cos 0.707

θ = 45º

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2 years ago

In Alamogordo, New Mexico, falling rocks are a hazard along US Highway 82. If a rock falls from a cliff with 157 N of force,what

jeka94

Answer:

Mass, m = 16.02kg

Explanation:

Given the following data;

Force, F = 157N

Since it's a free fall, acceleration, a = g = 9.8m/s² (acceleration due to gravity).

To find the mass;

Force is given by the multiplication of mass and acceleration.

Mathematically, Force is;

$F = ma$

Where;

F represents force measured in Newton.

m represents the mass of an object measured in kilograms.

a represents acceleration measured in meter per seconds square.

Making mass (m) the subject of formula, we have;

$Mass (m) = \frac{F}{a}$

Substituting into the equation;

$Mass (m) = \frac{157}{9.8}$

Mass, m = 16.02kg

Therefore, the mass of the rock is 16.02kg.

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2 years ago

The sound waves used for sonar are _____.

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Acoustic Energy

Sonar uses the echo principle by sending out sound waves underwater or through the human body to locate objects

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3 years ago

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