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3 years ago

12

Which of the following does not use an internal combustion enginea. a cannonb. a lawnmowerc. a windmilld. a car

2 answers:

lara31 [8.8K]3 years ago

6 0

The windmill does not use a combustion engine.

damaskus [11]3 years ago

3 0

Answer:

c) a Windmill

Explanation:

A lawn mower may have a two stroke or a 4 stroke internal combustion engine.

Wind mill is a device that runs with wind. When wind blows, wings of the wind mill rotate. Wind mills are used to generate electricity. It is a renewable source of energy that requires large farms or open space for their establishment and maintenance.

In a cannon gun powder is ignited , not with the help of an engine , but a different method for its ignition.

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2 years ago

You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the eart

hichkok12 [17]

Answer:

$v = 3.5 \times 10^5 m/s$

Explanation:

At some distance from the Earth the force of attraction due to moon is balanced by the force due to Moon

so we will have

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now we have

$\frac{d - r}{r} = \sqrt{\frac{M_m}{M_e}}$

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so we will have

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Now by energy conservation

$-\frac{GM_e}{R_e} - \frac{GM_m}{d - (R_e + R_m)} + \frac{1}{2}v^2 = -\frac{GM_e}{r} - \frac{GM_m}{d - r}$

$-6.26 \times 10^{8} - 13046 + \frac{1}{2}v^2 = -1.15 \times 10^6 - 1.28 \times 10^5$

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3 years ago

Is a sound wave mechanical or an electromagnetic wave

NNADVOKAT [17]

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2 years ago

The picture below shows a person swinging a yo-yo in a circle. Which vector shows the velocity of the yo-yo at this moment?

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2 years ago

A 12.0-g cd with a radius of 5.81 cm rotates with an angular speed of 33.2 rad/s. what is its kinetic energy?

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