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mash [69]
3 years ago
11

A car of the future requires 15kW of power to travel along a level road at 65km/h. A physics student wishes to use the car to dr

ive from Bowser to Qualicum, a distance of about 25 km. The engine is driven by heat energy recovered from a special material which has a specific heat capacity of 9800 J/kg • degree Celsius, If the car has 350 kg of this material, the outside air temperature is 15 °c and the engine is 88% efficient, to what temperature must the material be heated?
Physics
1 answer:
Luda [366]3 years ago
7 0
Power = Energy / time, The time is the one it takes to cover 25 km at 65 km/h, so:  time = 25/65*60*60 = 1384.6 seconds.

Now the total energy needed for that is: Energy = Power * time = 15,000 * 1384.6 = 20769239.8 J.

The heat provides those J. The heat for a difference in temperature is:

Heat = mass * c_h * Difference_of_temperature,

Heat = 350 * 9,800 * (T-15)*0.88,

where the 0.88 is because some of the heat is lost, efficiency 88%. Now, you can equal both results and get T:

350*9,800*0.88*(T-15) = 20769239.8

T-15 = 6.88, and T = 21.88 C

The answer is T= 21.88 C

NB: this specific heat, 9,800, is more than 2,000 time sthat of water, it is really a substance that does not exist,. It seems He has the highest (5,300) but it's a gas!
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Answer:

Explanation:

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The scientific method is a process that scientists use to understand the physical world. Place the four basic steps of the scien
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Answer:

a,b,c,e,d

Explanation:

The typical approach by the scientists use to understand the physical world includes the following steps:

Identifying a Problem

Researching the Information

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Testing the Hypothesis

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Analysis of the Data

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Therefore, according to the question the correct order would be:

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5 0
3 years ago
Which set of terms best defines what affects kinetic energy and potential energy, respectively?
aleksley [76]
<span>The correct answer is "velocity, height". Kinetic energy is affected by: mass and velocity, while potential energy by: mass, gravity and height (or "position"). Considering these combinations, only the third choice is the correct one: a) position, gravity describe only potential energy, B) gravity, position describe only potential energy, C) velocity, height describe respectively kinetic and potential energy, D) height, velocity would respectively describe potential energy first and then kinetic energy, it is in the wrong order, thus the correct answer is C.</span>
5 0
3 years ago
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(06.01 MC)
Misha Larkins [42]

Answer: C. Both observation 1 and observation 2

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God bless. <3

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3 years ago
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