a wedge is a small inclined plane
a screw is an inclined lane wkich goes round a centrral axis ... like a 'spiral' or helical staircase
easier per step ... more steps
The answer would be C. (:
Answer:B
Explanation:
Given
mass of sledge=82 kg
Force on sledge=160 N
degree
force has two component sin and cos
Normal reaction 


Answer:b
Explanation:
use the process of elimination,
A is wrong because a lake doesnt mean it can send up seashells
D is wrong since you cant blow seashells up