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2 years ago

The weight of a body is 147N. what is its mass?

Physics

1 answer:

barxatty [35]2 years ago

5 0

To find the mass, with only the weight:

⇒ must consider the relationship between the mass and weight

⇒ (in other words) we must find the equation that has both the

mass and weight

Based on our physics knowledge, we know:

$Weight=mass*gravitational_. acceleration$

Weight: 147N
Gravitational Acceleration: 9.8 m/s²

Now let's plug in the values, and solve:

$147N = mass*9.8_.m/s^2\\mass = 15_.kg$

Answer: 15 kg

Hope that helps!

*as a note, if you use the gravitational acceleration as 10m/s², then the answer would be 14.7 kg

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ladessa [460]

Answer:

a. E=1440KJ

b. E=360KJ

c. E=1.8 J

Explanation:

I have the power (Watts) is expressed as Energy (Joules) / Time (seconds), also I have to $1hour * \frac{60min}{1hour}*\frac{60s}{1min}\\1h=3600s$

so, for the lightbulb

$100W= \frac{Energy}{3600s*4}\\Energy=100W*14400s\\ E=1440000J =1440KJ$

Analogously, for the microwave

$1200W= \frac{Energy}{60s*5}\\Energy=1200W*300s\\ E=360000J =360KJ$

Now, I have to express the efficiency as Heat energy / power * 100 so $1.8= \frac{Heat Energy}{100W}*100\\Heat Energy=1.8J$

Done

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4 years ago

The temperature of a 2.0-kg block increases by 5°C when 2,000 J of thermal energy are added to the block. What is the specific h

Nadya [2.5K]

Heat = m x c x Δθ
2000 = 2 x c x 5
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3 years ago

A proton in a particle accelerator is traveling at a speed of 0.99c.(a) If you use the approximate nonrelativistic equation for

____ [38]

Answer:

a) p = 4.96 10⁻¹⁹ kg m / s , b) p = 35 .18 10⁻¹⁹ kg m / s ,

c) p_correst / p_approximate = 7.09

Explanation:

a) The moment is defined in classical mechanics as

p = m v

Let's calculate its value

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p = 4.96 10⁻¹⁹ kg m / s

b) in special relativity the moment is defined as

p = m v / √(1 –v² / c²)

Let's calculate

p = 1.67 10⁻²⁷ 0.99 10⁸/ √(1- 0.99²)

p = 4.96 10⁻¹⁹ / 0.141

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c) the relationship between the two values is

p_correst / p_approximate = 35.18 / 4.96

p_correst / p_approximate = 7.09

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3 years ago

Photons with the lowest energy have the

zhannawk [14.2K]

C. longest wavelength

Explanation:

Photons with the lowest energy have the longest wavelength and the shortest frequency.

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where f is the frequency of photon

h is the planck's constant

∧ is wavelength

c is the speed of light

The more the frequency, the higher the energy of the photon.

Photons with low energy have long wavelength.

Learn more:

Wavelength brainly.com/question/6352445

#learnwithBrainly

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