Answer:
is the initial velocity of tossing the apple.
the apple should be tossed after 
Explanation:
Given:
- velocity of arrow in projectile,

- angle of projectile from the horizontal,

- distance of the point of tossing up of an apple,

<u>Now the horizontal component of velocity:</u>



<u>The vertical component of the velocity:</u>



<u>Time taken by the projectile to travel the distance of 30 m:</u>



<u>Vertical position of the projectile at this time:</u>



<u>Now this height should be the maximum height of the tossed apple where its velocity becomes zero.</u>


is the initial velocity of tossing the apple.
<u>Time taken to reach this height:</u>



<u>We observe that </u>
<u> hence the time after the launch of the projectile after which the apple should be tossed is:</u>



Answer:
μ = 0.038 Pa.s
Explanation:
Given that
V= 1.5 m/s
r= 2 mm
L = 18 cm
If we assume that flow inside the tube is laminar ,then the pressure drop ΔP given as




μ = 0.038 Pa.s
The viscosity of the fluid = 0.038 Pa.s
Light could not act as a medium for a mechanical wave
Answer:
negative work is done.
Explanation:
Here a football player pushes against another player so the force is applied by the football player so that it will move ahead Now here the force of another player is opposite to his motion so the work done on player by another player is negative.
So work done is negative because it is done on the system.