Four different food colourings are analysed using chromatography. The results are shown on the chromatogram. The diagram is not drawn to scale.
Which food colouring contains a component with an R value of 0.3?
solvent front
10 cm
8cm-
0
6cm-
0
0
Acm
0
2 cm
0
0
baseline
9
B

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.