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Serga [27]
3 years ago
7

1. You wish to heat 20 kg of water from 40°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this c

orrespond?​
Physics
1 answer:
adelina 88 [10]3 years ago
8 0

Answer:

<h2>3,343.68kJ </h2>

Explanation:

Heat energy used up can be calculated using the formula:

H = mcΔt

m = mass oof the object (in kg) = 20kg

c = specific heat capacity of water = 4179.6J/kg°C

Δt change in temperature = 80-40 = 40°C

H= 20* 4179.6 * 40

H = 3,343,680Joules

H = 3,343.68kJ

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In a series circuit, the voltage divides across the resistors in proportion to
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3 years ago
If Scoobie could drive a Jetson's flying car at a constant speed of 450.0 km/hr across oceans and space, approximately how long
vladimir2022 [97]

Answer:

The value is t = 3.6 \  days

Explanation:

From the question we are told that

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Generally the circumfernce of the earth is mathematically evaluated as

C =  2\pi  R

=> C =   2 * 3.142 *   6200

=> C =  38960.8 \ km

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t =  \frac{38960.8}{450.0}

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Converting to days

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7 0
3 years ago
Which type of mine involves digging tunnels and shafts deep underground?
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The mine involves digging tunnels and shafts deep underground is the underground mining.

<h3>What is mining?</h3>

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Thus, underground mining involves digging tunnels and shafts deep underground.

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One observer stands on a train moving at a constant speed, and one observer stands at rest on the ground. The person on the trai
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Answer:

Option D.

Value cannot be calculated without knowing the speed of the train

Explanation:

The speed of the beam can only be calculated accurately when the speed of the train is put into consideration. Based of the theory of relativity, the observer is on the ground, and the train is moving with the beam of light inside it. This causes a variation in the reference frames when making judgements of the speed of the beam. The speed of the beam will be more accurate if the observer is moving at the same sped of the train, or the train is stationary.

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