Question

Physics !!!!!!!!!!!!

Answer 1

1) The identity is true

2) The child has a greater momentum than the bike.

3) The total momentum of a closed system remains constant throught time, regardless of changes within the system

Explanation:

1)

We need to rewrite the Newton, which is the unit of the force (F). Using Newton's second law:

$F=ma \rightarrow [N] = [kg][m/s^2]$

So, $N\cdot s$ (left side) is equal to

$N\cdot s = kg\cdot s \cdot \frac{m}{s^2}=kg \cdot \frac{m}{s}$

So, the identity is true.

2)

The momentum of an object is given by:

$p=mv$

where

m is the mass of the object

v is its velocity

Here we have:

M = 23 kg is the mass of the child

v = 4.5 m/s is the velocity of the child

So its momentum is

$p=Mv=(23)(4.5)=103.5 kg m/s$

The bike has

m = 5.5 kg is its mass

v = 4.5 m/s is its velocity

So, its momentum is

$p=mv=(5.5)(4.5)=24.8 kg m/s$

So, the child has a greater momentum than the bike.

3)

A closed system is a system on which the next external force acting on it is zero:

$F=0$

From Newton's second law, we know that the net force acting on a system is equal to the rate of change of momentum of the system:

$F=\frac{\Delta p}{\Delta t}$

where

$\Delta p$ is the change in total momentum of the system

$\Delta t$ is the time interval

For a closed system, this implies that

$\Delta p = 0$

which means that the total momentum is constant.

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