Question

The Accipitridae bird is one of the well-known birds of prey. A accipitridae bird which has a mass of exactly 5.0kg is hungry and goes hunting. The bird sees a mouse on the ground below it. After finally catching it, the bird goes back to its nest, flying at a constant horizontal velocity, carrying the 1.5kg mouse along. You may want to ignore air resistance::

1.. What must the lift force acting on the bird be if it is to maintain the constant velocity?

2.. The birds nest is sitting on the surface of a rock which is inclined at 30 degrees above the horizontal. During its landing, the bird is able to exert a maximum force of 87N downwards on the rock.

A) What frictional force is required in order to stop the bird from sliding down the rock when it lands?

B) is the bird able to land on the rock without sliding down it? While answering this question it is important to consider the maximum force that the bird exerts on the rock while it is landing.

Please explain these answers well and use diagrams when required.

Answer 1

1. the lift should be equal to the weight of the bird and mice together so the lift equals 6.5*9.8=63.7 N

2 A. In this one thing is not clear it says the bird applies a maximum of 87 N which is including the weight or excluding. assuming its including the weight , the component of this along the plane is 87 sin 30= 43.5 N , so the frictional force must be 43.5 netons

for last part we need more info like co efficient of friction between the bird and the rock