Question 1
Explain how Physics is important to Historians.
Answer
Historians use knowledge of carbon dating studied under radioactivity in Physics to establish ages of fossils.
Question 2
The density of concentrated sulphuric acid is 1.8 gcm-3. Calculate the volume 0f 4.5 kg of the acid.
Answer
-
P = (1.8 x 1000) =
v = 0.0025 m3 or 2500 cm3
Question 3
State the reason why a person is likely to nosebleed at the top of a mountain.
Answer
At the top of mountain there is very low atmospheric pressure compared to blood pressure. (Due to lower atmospheric pressure at the top of the mountain)
Question 4
Explain why weight of an object varies from place to place.
Answer
Due to variation of gravitational field strength from place to place.
Question 5
The diagram below shows a block of mass 400 mg.
Calculate in SI unit the volume of the block.
Answer
V = L x W x H
V = 0.12 m x 0.06 m x 0.02 m
V = 0.000144 m3 or 1.44 x 10-4 m3
V = 0.12 m x 0.06 m x 0.02 m
V = 0.000144 m3 or 1.44 x 10-4 m3