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guajiro [1.7K]
3 years ago
10

Select the correct answer. Which of Newton's laws explains why your hands get red when you press them hard against a wall? A. Ne

wton's law of gravity B. Newton's first law of motion C. Newton's second law of motion D. Newton's third law of motion
Physics
1 answer:
STatiana [176]3 years ago
8 0

Answer:

D newton third law

Explanation:

good luck

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c

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A 3.0 kg rifle is held firmly by a 50.0 kg woman, initially standing still. A 0.06 kg bullet leaves the rifle muzzle with a velo
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1. What quantity of heat is required to raise?
netineya [11]

Answer: Calculate the energy required in joules to raise the temperature of 450 grams of water from 15°C to 85°C? (The specific heat capacity of water is 4.18 J/g/°C)

Explanation:

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How far will you travel if you walk for 10.0 minutes at a speed of 1.50 m/s?
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3 years ago
First consider a Carnot engine that operates between a hot reservoir at 58°C and a cold reservoir at -17°C. In running 24 minute
jok3333 [9.3K]

Answer:

Explanation:

Given that,

Hot reservoir temperature is

TH = 58°C

TH = 58 + 273 = 331 K

Cold reservoir temperature

TC = -17°C

TC = -17°C + 273 = 256K

In 24minutes 590 J of heat was removed from hot reservoir

t = 24mins

t = 24 × 60 = 1440 seconds

Then,

Power is given as

P = E / t

P = 590 / 1440

P = 0.41 W

Since this removed from the hot reservoir, then, QH = 0.41W

We want to find heat expelled to the cold reservoir QX

Efficiency is given as

η = 1 - TH/TC = 1 - QH/QC

1 - TH/TC = 1 - QH/QC

TH/TC = QH/QC

Make QC subject of formula

QC = QH × TC / TH

QC = 0.41 × 256 / 331

QC = 0.317 W

7 0
3 years ago
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