An IGCSE student thinks it may be possible to identify different rocks (A, B and C) by measuring their densities. She uses an electronic balance to measure the mass of each sample and uses the displacement
method to determine the volume of each sample.

See the answer below

Explanation:

a. The volume in the first measuring cylinder reads 70 while that of the second reads 95  . Hence;

V1 = 70  

V2 = 95  

b. An object will always displace its own volume in a liquid. Hence:

Volume V of the rock sample = V2 - V1

   = 95 - 70 = 25  

c. Mass of A = 102 g

   Volume of A = 25  

Density = mass/volume

Hence, density of A = 102/25 = 4.08 g/

answer: good job it's all correct !

explanation:

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2