Aclosed system contains 30g of gas. how much heat(in joules) is added to or rejected by the system to produce 5000 n-m of work while the stored energy decreases by 200 j/g?

Answer : The heat rejected by the system is 1000 J

Explanation :

As per first law of thermodynamic,

where,

= internal energy  of the system

q = heat  added or rejected by the system

w = work done of the system

First we have to determine the internal energy for 30 grams of gas.

As, 1 gram of gas has internal energy = 200 J

So, 30 grams of gas has internal energy = 200 × 30 = 6000 J

Now we have to determine the heat of the system.

 = -6000 J

w = 5000 N.m = 5000 J

Now put all the given values in the above formula, we get:

The negative sign indicate that the heat rejected by the system.

Hence, the heat rejected by the system is 1000 J

the expression 15n + 2(3p) represents the amount isaiah spent buying gasoline and snacks, where n represents the price of each gallon of gasoline and p represents the cost of each snack that he bought. which statement is true about the amount isaiah spent?

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .