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Alex787 [66]
3 years ago
9

how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficie

nt

Physics
1 answer:
vagabundo [1.1K]3 years ago
3 0

Here i state the conservation of energy rule and use that to justify my answer. I showed how to manipulate percentages to get the final answer of 11000J (2sf). Hope I'm right xx

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Helpppp!!!
zubka84 [21]

Answer:

B

Explanation:

7 0
3 years ago
22) What is the difference between the plasma and gaseous states of matter?
nirvana33 [79]
I think the ans is b.)

Also, in plasma gas, it's so hot that the electrons,protons and neutrons are separated from their bond so plasma can conduct electricity as it has free electrons

Hope it helps!
7 0
3 years ago
Slow moving vehicles that travel at a speed less than ___ mph will have an orange reflective triangle with red around the edges
nika2105 [10]
Slow moving vehicles that travel at a sped less than 25 MPH will have ...........
Slow moving vechicles [SMV] are those vehicles that travel on the road at a speed that is less than the recommended speed, example of a slow moving vehicle is tractor. These vehicles must have SMV signs on them to notify other drivers that they would not be travel fast.
7 0
2 years ago
For general projectile motion, which of the following best describes the horizontal component of a projectile's acceleration? As
malfutka [58]

Answer:

E ) The horizontal component of a projectile acceleration is zero.

Explanation:

In case of a projectile , force of gravity acts in vertically downward direction so acceleration will act in vertically downward direction . Its direction never changes during course of its journey. So horizontal component of acceleration will always be zero at all points of its journey.

7 0
2 years ago
A 6.0-cm-diameter horizontal pipe gradually narrows to 4.5 cm. When water flows through this pipe at a certain rate, the gauge p
Rufina [12.5K]

Answer:

0.0072 m³/s

Explanation:

Using Bernoulli's law

P₁ + 1/2ρv₁² = P₂ + 1/2ρv₂ since the pipe is horizontal

1/2ρv₂² - 1/2ρv₁² = P₁ - P₂

flow rate is constant

A₁v₁ = A₂v₂

A₁ = πr₁² = π (0.06/2)² = 0.0028278 m²

A₂ = πr₂² = π (0.0225)² = 0.00159 m²

v₁  = (A₂ / A₁)v₂

v₁  = (0.00159 m²/ 0.0028278  m²) v₂ = 0.562  v₂

substitute v₁  into the Bernoulli's equation

1/2ρv₂² - 1/2ρv₁² = P₁ - P₂

500 ( 1 - 0.3161 ) v₂²  = (31.0 - 24 ) × 10³ Pa

341.924 v₂² = 7000

v₂² = 20.472

v₂ = √ 20.472 = 4.525 m/s

volume follow rate = 0.00159 m² ×  4.525 m/s = 0.0072 m³/s

8 0
3 years ago
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