A 0.775-m3 rigid tank initially contains air whose density is 1.18 kg/m3. The tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m3. Determine the mass of air that has entered the tank.

2.9 kg

Explanation:

Given that a 0.775-m3 rigid tank initially contains air whose density is 1.18 kg/m3.

According to the definition of density

Density = mass/volume

1.18 = mass / 0.775

Mass = 1.18 × 0.775

Mass = 0.9145 kg

Given that the tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m3.

Using the same density formula

Density = mass/volume

4.95 = mass / 0.775

mass = 3.83625 kg

To determine the mass of air that has entered the tank, take away the mass of the air initial in the tank from the mass calculated

Mass = 3.83625 - 0.9145

Mass = 2.923kg

Therefore, the mass of air that has entered the tank is 2.9 kg approximately.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

see earlier answer