10 Fig. 10.1 shows a car braking system. The brake fluid is an oily liquid. The brake drum rotates with the wheel of the car.
(a) Explain how pushing the brake pedal makes the brake shoes rub against the drum.
[2]

2. they have negligible mass.

Gas will most likely  fill the container 

Each student aligns the edge of the object with the left edge of the ruler as shown above. all four students read the ruler with a measurement of 4.6 cm. which statement describes the data they collect? i believe the answer is: the data have poor precision and poor accuracy because of a systematic error.

Answer4 million;