Chemistry, 16.09.2019 08:20, juliannabartra

Car q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. each car has a 45-l fuel tank. car z must stop to refuel after traveling for 4.2 hours. car q, however, travels for 5.4 hours before running out of gas. for each car, calculate the average kilometers traveled for each liter of gas (km/l)

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answered: melmar76

Explanation:

For car Z, according to the Newton equation,

v = u + at

where, v = final velocity = 0

u = initial velocity = 120 km/h

a = acceleration

t = time = 4.2 hours

Putting the given values into the above formula as follows.

v = u + at

0 = $120 km/h + a \times 4.2 hr$

a = 28.571 $km/h^{2}$

Also, it is known that $v^{2} = u^{2} + 2as$

s = $\frac{v^{2} - u^{2}}{2a}$

Putting the values into the above formula calculate for 's' as follows.

s = $\frac{v^{2} - u^{2}}{2a}$

= $\frac{(0)^{2} - (120)^{2}}{2 \times 28.571 km/hr^{2}}$

= 252.0 km

Since, 45 L of fuel is used by the car to travel 252 km. Then calculate car traveled km per liter as follows.

$\frac{252 km}{45 L}$

= 5.6 km/L

For car Q, v = u + at

0 = $120 + a \times 5.4 hr$

a = $\frac{120 km/hr}{5.4 hr}$

= 22.22 $km/hr^{2}$

Now, calculate value of 's' for car Q as follows.

s = $\frac{v^{2} - u^{2}}{2a}$

= $\frac{(0)^{2} - (120)^{2}}{2 \times 22.22 km/hr^{2}}$

= 324.0 km

Hence, average kilometers traveled for liter of gas is as follows.

$\frac{324 km}{45 L}$

7.2 km/L

Thus, we can conclude that the average kilometers traveled for each liter of gas (km/L) by car Z is 5.6 km/L and for car Q is 7.2 km/L.

answered: Guest

the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.

answered: Guest

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

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Car q and z are put though an endurance test to see if they can travel at 120 km/h for 5.0 hours. ea...