Answer:
A body at rest remains at rest and a body in motion remains in uniform motion in a straight line unless acted upon by an external force is law of motion.
Empty space; an atom consists of a dense, positively charged nucleus surrounded by a "cloud" of negatively charged electrons
Answer:
Scale reading for no wind 
Explanation:
From the question we are told that
Area 
Weight of board 
Velocity 
Density of air 
Generally the equation for pressure difference by Bernoulli equation is mathematically given by
Generally force acting on the board by air is mathematically given by
Therefore
Scale reading for no wind W'
Scale reading for no wind W'=60N
Answer: 0.169 (3 s.f.)
Explanation:
Force = 76 N
Spring constant = 450 N/m
Extension/displacement = x
Hooke's law states that: F = kx
Therefore, 76 = 450 X x
76/450 = x
0.169 (3 s.f.) = x
Answer:
To have a positive job, the two vectors must have the same direction
Explanation:
Work is a scalar defined as the scalar product of two vectors, the froce and the displacement. To have a positive job, the two vectors must have
collinear and that their arrows point in the same direction.
You can also appreciate this from the work equation
W = F. r
bold indicate vector
W = F r cos θ
With θ the angle between force and displacement
