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s344n2d4d5 [400]
3 years ago
15

An automobile engine has an efficiency of 22.0% and produces 2510 J of work. How much heat is rejected by the engine

Physics
1 answer:
katrin [286]3 years ago
5 0

Answer:

If efficiency is .22 then  W = .22 * Q   where Q is the heat input

Heat Input    Q = 2510 / .22 = 11,400 J

Heat rejected = 11.400 - 2510 = 8900  J of heat wasted

Also, 8900 J / (4.19 J / cal) = 2120 cal

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andre [41]

Answer:

2.5 s, 5 m

Explanation:

The equations for the horizontal and vertical position of Lukalu are:

x(t) = 8t\\y(t) = -16t^2 + 100

we can find the time it takes her to reach the ground by requiring that the vertical position becomes zero:

y(t) = 0

So we find:

0=-16t^2 +100\\16t^2 = 100\\t=\sqrt{\frac{100}{16}}=2.5 s

The horizontal distance of Lukalu instead will be given by the equation for the horizontal position, substituting t = 2.5 s:

x=8t = 8 \cdot 2.5 s =5 m

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3 years ago
Why are the wires twisted around each other in twisted pair cable?
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Learn more about twisted pair cable here:

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5 0
2 years ago
The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet (complete outer energy level)
DanielleElmas [232]

Answer:

C. unlikely to combine with other elements.

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

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Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc.

Hence, the full octet makes the gas (neon) unlikely to combine with other elements.

7 0
3 years ago
If a crane worker lifts a crate with a mass of 250 kg from the ground to a
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D.

The gravitational of a body is possessed by the body due to the virtue of its position.

The formula for gravitational potential energy is,

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Substituting the values

196*9.8*250= 49k

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2 years ago
What happens when a boxer doesn't make weight?
ryzh [129]
They would just have to box in a higher weight class
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