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3 years ago

Which of the following changes would make a heat engine less efficient

1 answer:

8 0

A heat engine would be less efficient due to many factors
For instance, a heat engine is more efficient when it uses in cold weather because there is a greater temperature difference ( Carnot Efficient )
A heat engine could be less efficient because of friction
Hope it helps I am a beginner

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When a star is in the main-sequence stage of its life, it is fusing __________ into ________

gizmo_the_mogwai [7]

Hydrogen into helium

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3 years ago

Two horizontal rods are each held up by vertical strings tied to their ends. Rod 1 has length L and mass M; rod 2 has length 2L

antiseptic1488 [7]

Answer:

Rod 1 has greater initial angular acceleration; The initial angular acceleration for rod 1 is greater than for rod 2.

Explanation:

For the rod 1 the angular acceleration is

$\tau_1 = I_1\alpha _1 \\\\\alpha_1 = \dfrac{\tau_1}{I_1}$

Similarly, for rod 2

$\alpha_2 = \dfrac{\tau_2}{I_2}.$

Now, the moment of inertia for rod 1 is

$I_1 = \dfrac{1}{3}ML^2$ ,

and the torque acting on it is (about the center of mass)

$\tau_1 = Mg\dfrac{L}{2};$

therefore, the angular acceleration of rod 1 is

$\alpha_1 = \dfrac{Mg\dfrac{L}{2}}{\dfrac{1}{3}ML^2},$

$\boxed{\alpha_1 = \dfrac{3g}{2L} }$

Now, for rod 2 the moment of inertia is

$I_2 = \dfrac{1}{3}(2M)(2L)^2$

$I_2 = \dfrac{8}{3} ML^2,$

and the torque acting is (about the center of mass)

$\tau _2 = (2M)g \dfrac{(2L)}{2}$

$\tau _2 = 2MgL;$

therefore, the angular acceleration $\alpha_2$ is

$\alpha_2 = \dfrac{2MgL;}{\dfrac{8}{3} ML^2,}.$

$\boxed{\alpha_2 = \dfrac{3g}{4L}}$

We see here that

$\dfrac{3g}{2L} > \dfrac{3g}{4L}$

therefore

$\boxed{\alpha_1 > \alpha_2.}$

In other words , the initial angular acceleration for rod 1 is greater than for rod 2.

7 0

3 years ago

HELP HELP PLZZ!!!

nika2105 [10]

This is because the diagram represented isotopes of Nitrogen. Isotopes are forms of an element with an equal number of protons but different number of neutrons.

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3 years ago

Oz discusses his work in the circus in the wonderful wizard of oz. he tells them about the ventriloquists in the circus. what is

iren [92.7K]

a person who alters their voice to make it seem as though the sound is coming from somewhere else, typically a puppet is a ventriloquist.

<h3>Which ventriloquist was the best?</h3>

Jimmy Nelson, an American ventriloquist who performed on television in the 1950s and 1960s, was born on December 15, 1928.

<h3>What makes it a ventriloquist?</h3>

The incorrect but long-held notion that the voice came from the stomach is explained by the word ventriloquism's Latin roots, ventri (belly) and loquor (to talk).

<h3>Why is a ventriloquist good?</h3>

Making your puppet seem lifelike and honing your voice are essential for becoming a competent ventriloquist. To divert attention from yourself, keep moving the body, arms, and head of the creature. To assist people forget that your puppet is actually you, try to make the character as different from you as you can.

learn more about ventriloquist here

<u>brainly.com/question/15900836</u>

#SPJ4

7 0

2 years ago

A school bus travels 50 km/hr for 0.75 hr. How far did the bus go?

PSYCHO15rus [73]

Explanation:

speed = 50 km/h

time = 0.75 hr

dist. = time × speed

dist. = 0.75 × 50

dist.= 37.5 km

7 0

3 years ago

Read 2 more answers