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2 years ago

How can you make the work output of a machine greater than the work input?

Physics

1 answer:

Vsevolod [243]2 years ago

7 0

Answer: D) none of the above

Explanation: This is a classic problem of thermodynamics, and refers to the principle of conservation of energy to give a correct answer

Option A) can be ruled out since no matter how much friction is reduced, it will always exist and therefore some energy will be lost

option B) and C) are out of context since the loss of work or energy will continue to exist even if those values are modified, so they do not answer the question

D) is the correct one since it should be said that this is not possible (so far...) as it goes against the conservation of energy and this option is none of the above

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Ocean waves pass through two small openings, 20.0 m apart, in a breakwater. You're in a boat 70.0 m from the breakwater and init

Klio2033 [76]

Answer:

λ = 5.65m

Explanation:

The Path Difference Condition is given as:

δ= $(m+\frac{1}{2})\frac{lamda}{n}$ ;

where lamda is represent by the symbol (λ) and is the wavelength we are meant to calculate.

m = no of openings which is 2

∴δ= $\frac{3*lamda}{2}$

n is the index of refraction of the medium in which the wave is traveling

To find δ we have;

δ= $\sqrt{70^2+(33+\frac{20}{2})^2 }-\sqrt{70^2+(33-\frac{20}{2})^2 }$

δ= $\sqrt{4900+(\frac{66+20}{2})^2}-\sqrt{4900+(\frac{66-20}{2})^2}$

δ= $\sqrt{4900+(\frac{86}{2})^2 }-\sqrt{4900+(\frac{46}{2})^2 }$

δ= $\sqrt{4900+43^2}-\sqrt{4900+23^2}$

δ= $\sqrt{4900+1849}-\sqrt{4900+529}$

δ= $\sqrt{6749}-\sqrt{5429}$

δ= 82.15 -73.68

δ= 8.47

Again remember; to calculate the wavelength of the ocean waves; we have:

δ= $\frac{3*lamda}{2}$

δ= 8.47

8.47 = $\frac{3*lamda}{2}$

λ = $\frac{8.47*2}{3}$

λ = 5.65m

3 0

4 years ago

1 Which photograph of Lange's is a portrait orientation? Which photograph of Lange's is a landscape orientation? Be sure to supp

Temka [501]

Answer: Is there any photographs to choose from?

4 0

4 years ago

Coal is NOT considered a mineral because it is organic and made from the remains of once living things. true or false

Nana76 [90]

Hello!

The answer to your question is.

True. Coal is NOT considered a mineral because it is organic and made from the remains of once living things.

~Hope this Helps!~

8 0

3 years ago

Whenever one object exerts a force on another object, the second object exerts a force of the same magnitude on the first object

Naddik [55]

Answer:

Explanation:

Newton third law of motion state that action and reaction are equal and opposite

6 0

3 years ago

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field

Brums [2.3K]

Answer:

the electric field direction should be in positive y axis

Explanation:

Lets assume that charge on particle is positive and it isequal to +q

First calculate the magnetic force on it

$F_B = q V\times B =qVBsin\theta$

for direction

use Right Hand Rule which will give the direction and by using his the direction will come towards negative y axis.

As given in the question that charge particle does not change their velocity so we need to apply electric field in such a way that electric force direction should be opposite to the magnectic field.

and magnitude should be same as magnectic force and also direcion of electric force depend on the direction of elecric field when charge is positive because electric force $F_E = qE$

Hence the electric field direction should be in positive y axis

3 0

4 years ago