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telo118 [61]
3 years ago
5

Marek is trying to push a box of sports equipment across the floor. The arrow on the box is vector representing the force that m

arek exerts. What are the forces acting up one the box?
Answer quick
Chemistry
1 answer:
Dennis_Churaev [7]3 years ago
7 0

Answer:

Gravity force (friction towards Marek ).

Explanation:

According to the situation, Marek try to push the box which contains some mass because of sports equipment  

Marek tries to push the box, but gravity tries to the down box on the floor.

So, box and floor create friction towards Marek

.

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Explanation:

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4 0
2 years ago
How much heat energy is required to melt 75g of ice at 0°C?
Mnenie [13.5K]

The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol. This means for every mole of ice we melt we must apply 6.02 kj of heat. We can calculate the heat needed with the following equation:

Q = N x ΔH

where:

Q  = heat

N  = moles  

ΔH  = enthalpy

In this problem we would like to calculate the heat needed to melt 35 grams of ice at 0 °C. This problem can be broken into three steps:


1. Calculate moles of water

2. multiply by the enthalpy of fusion

3. Convert kJ to J.


Step 1 : Calculate moles of water

[ 75g ] x (\frac{1 mol}{18.02g} ) =

Step 2 : Multiply by enthalpy of fusion

Q = N × ΔH  = <em> [ Step 1 Answer ]</em> ×  6.02 =

Step 3 : Convert kJ to J

[ Step 2 Answer ] x (\frac{1000j}{1kJ} ) =

Finally rounding to 2 sig figs (since 34°C has two sig figs) we get


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Answer:

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