Answer:
4.2591 cm
Explanation:
We have given focal length of the lens f=6.91 cm
Object distance u =11.1 cm
We have to find the image distance that is v
For the lens we know that 
So 



Answer:
Hoop.
Explanation:
The angular acceleration performed at a given torque:

The moments of inertia of each element are described below:
Hoop

Solid sphere

Flat disk

Hollow sphere

The greater the moment of inertia, the greater the torque to obtain the same angular acceleration. Therefore, the hoop requires the largest torque to receive the same angular acceleration.
Answer:
W = 1222.4 J = 1.22 KJ
Explanation:
The work done on an object is the product of the force applied on it and the displacement it covers as a result of this force. It must be noted that the component of displacement in the direction of force should only be used. Hence, the work can be calculated as:
W = F d Cosθ
where,
W = Work Done = ?
F = Force Applied = 64 N
d = Distance Covered by Box = 19.1 m
θ = Angle between force and displacement = 0°
Therefore,
W = (64 N)(19.1 m)Cos 0°
<u>W = 1222.4 J = 1.22 KJ</u>
Oxygen and carbon dioxide
True !! Hope I helped you out a bit!