Static friction is the friction that exists between two or more solids that are not moving with a relative speed. To calculate the static friction coefficient we use the formula Fs=us × n where Fs is the static friction , us is the coefficient of static friction and the n is the normal force.
thus the coefficient of static friction will be 5 N÷ 25 N = 0.2
Hence 0.2 is the coefficient of static friction
Answer:
To summarize, <em><u>Jane's star</u></em> has a <em><u>red</u></em> light and <em><u>is traveling towards</u></em> the <em><u>Earth</u></em> while <em><u>John's star </u></em>has a <em><u>blue</u></em> light and <em><u>is traveling away</u></em> from the <em><u>Earth</u></em>. This is a <em><u>prime example</u></em> of the <em><u>Doppler Effect</u></em> in <em><u>motion</u></em>. The stars <em><u>look different </u></em>because <em><u>they are traveling in different directions.</u></em>
Answer:
Work done during lifting up body is 0
Explanation:
From the question it is given that
Distance traveled by body during lifting is 2 m
since work done by body is given by
work done W = F x s x cosθ
Where F= mg = weight of body
s= distance traveled = 2m
θ = angle between force and distance vector
here θ = 90° as body is lifting up
on substituting the respected values we get
⇒ W = mg x 2 x cos90° = 0 {∵ cos90°= 0 }
Thus, work done during lifting up body is 0
The force exerted(applied) onto a surface by the weight of air