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Which one of the following substances is a liquid fuel used in rocket engines? A. Potassium perchlorate B. Liquid oxygen C. Ammonia D. Sodium nitrate
Liquid oxygen is a liquid fuel used in rocket engines.
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Asked 6/17/2019 7:51:50 AM
Updated 245 days ago|11/28/2020 4:57:54 PM
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Liquid oxygen is a liquid fuel used in rocket engines.
Added 245 days ago|11/28/2020 4:57:54 PM
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The transmission of heat requiring the movement of a liquid or a gas is A. radiation. B. transduction. C. conduction. D. convection.
Weegy: The transmission of heat requiring the movement of a liquid or a gas is convection. (More)
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Updated 115 days ago|4/8/2021 2:30:17 AM
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The main difference between turbojets and rocket engines is the fact that A. rocket engines need oxygen from the air. B. rocket engines aren't dependent on oxygen from the air. C. turbojets aren't dependent on oxygen from the air. D. turbojets carry their own supply of oxygen as oxidizers.
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Updated 245 days ago|11/28/2020 4:57:39 PM
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The main difference between turbojets and rocket engines is the fact that rocket engines are not dependent on oxygen from the air.

Added 245 days ago|11/28/2020 4:57:39 PM
This answer has been confirmed as correct and helpful.
During the stage of internal-combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, A. the intake valve is open, and the exhaust valve is closed. B. both the intake and exhaust valves are open. C. both the intake and exhaust valves are closed. D. the exhaust valve is open, and the intake valve is closed.
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Updated 360 days ago|8/5/2020 1:05:01 PM
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During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, both valves will be closed.

Added 360 days ago|8/5/2020 1:05:01 PM
This answer has been confirmed as correct and helpful.
Convert the temperature 288 K to degrees Celsius. A. 561°C B. 748°C C. –172°C D. 15°C
Weegy: The temperature 288 K converted to degrees Celsius is 15°C. (More)
Question
Updated 6/17/2019 7:16:22 PM
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What's the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s? A. 6,000 J B. 12,000 J C. 2,940 J D. 5,880 J
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Updated 355 days ago|8/11/2020 12:52:12 AM
1 Answer/Comment
The kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s is: 6,000 J.
Solution:
KE = 1/2 * m * v^2
KE = (1/2) * 30 * (20^2)
KE = (1/2) *30* 400
KE = 6000 J
Added 355 days ago|8/11/2020 12:52:12 AM
This answer has been confirmed as correct and helpful.
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