Question

3. A bird flying 4 m/s has 8 joules of kinetic energy. What is the mass of the bird?

Answer 1

The mass of the bird is 2 kg.

Step-by-step explanation:

The kinetic energy of an object can be calculated using the formula:

Kinetic Energy (KE) = 0.5 * mass * velocity^2

In this case, we are given that the bird has a kinetic energy of 8 joules and is flying at a velocity of 4 m/s. We can plug these values into the formula:

8 = 0.5 * mass * (4)^2

Simplifying the equation:

8 = 0.5 * mass * 16

Dividing both sides by 8:

1 = 0.5 * mass

Dividing both sides by 0.5:

mass = 2 kg

Therefore, the mass of the bird is 2 kg.

Answer 2

The mass of the bird is 1 [kg]

Step-by-step explanation:

The kinetic energy is defined by the following equation:

`E_(k) =(1)/(2) *m*v^(2)\\`

where:

m= mass of the bird [kg]

v = velocity of the bird [m/s]

Ek = kinetic energy [J]

We need to clear the mass from the equation given.

`m=(2*E_(k) )/(v^(2)) \\m=(2*8)/((4)^(2) ) \\m=1 [kg]`