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

An eagle is circling looking for prey, it completes a circle of
radius 10 m every 5 s. Birds can use their skills to make air exert
a force on them in any direction.
a) Draw a diagrams of the eagle’s motion, indicate the velocity
vector and the coordinate
system.
b) What are the linear and angular speed of the eagle?
c) If the eagle increases its speed over thirty seconds, to
complete one circle (r=10m) every 3s,
calculate the...

An eagle is circling looking for prey, it completes a circle of
radius 10 m every 5 s. Birds can use their skills to make air exert
a force on them in any direction.
a) Draw a diagrams of the eagle’s motion, indicate the velocity
vector and the coordinate system. (4 points)
b) What are the linear and angular speed of the eagle? (3
points)
c) If the eagle increases its speed over thirty seconds, to
complete one circle (r=10m)...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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