Answer:

Explanation:
When the rock is immersed in unknown liquid the forces that act on it are shown as under
1) Tension T by the string
2) Weight W of the rock
3) Force of buoyancy due to displaced liquid B
For equilibrium we have 
=
When the rock is suspended in air for equilibrium we have

When the rock is suspended in water for equilibrium we have
+
=
Using the given values of tension and solving α,β,γ simultaneously for
we get

Solving for density of liquid we get


Answer:
34 m/s
Explanation:
The law of conservation of linear momentum dictates that the sum of initial and final momentum should be equal. Momentum is a product of mass and velocity.
Since the canon recoils, its recoil velocity is opposite hence
MV=nu where M and n are mass of cannon and cannoball respectively, v and u are the velocities of cannon and cannon balls respectively.
Substituting 200 kg for M and 1.7 m/s for v then 10 kg for n
200*1.7=10u
U=200*1.7/10=34 m/s
You want to do it all by yourself ? Nothing to it !
Take a piece of rope that's maybe 12 to 18 inches long. Take one end
of the rope in each hand, raise your hands up in front of you, and make
like you're trying to stretch the rope. You'll automatically make the forces
of your hands equal and opposite, so that the rope just stays there in front
of you and doesn't move.
Answer:
the moment
Explanation:
the shorter the distance from the force, the lesser the torque acting on it