Alex goes cruising on his dirt bike. He rides 700 m north, 300 m east, 400 m north, 600 m west, 1200 m south, 300 m east, and fi
1 answer:
ANSWER
EXPLANATION
First, let us make a sketch of the question:
From the diagram:
=> black line represents North
=> green line represents East
=> blue line represents West
=> red line represents South
From the diagram, we see that at the end of his journey, he returns to his start point.
Since displacement is the measure of the change in the position of an object and the boy's position did not change after the journey, his displacement is:
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Answer:
a) v= 1732.05m/s
b) d=250000m
c) v= 1414.214m/s
Explanation:
Notation
M= mass of the asteroid
m= mass of the particle moving upward
R= radius
v= escape speed
G= Universal constant
h= distance above the the surface
Part a
For this part we can use the principle of conservation of energy. for the begin the initial potential energy for the asteroid would be .
The initial kinetic energy would be . The assumption here is that the particle escapes only if is infinetely far from the asteroid. And other assumption required is that the final potential and kinetic energy are both zero. Applying these we have:
(1)
Dividing both sides by m and replacing by
And the equation (1) becomes:
(2)
If we solve for v we got this:
Part b
When we consider a particule at this surface at the starting point we have that:
Considering that the particle is at a distance h above the surface and then stops we have that:
And the balance of energy would be:
Dividing again both sides by m and replacing by
we got:
If we solve for h we can follow the following steps:
And subtracting R on both sides and multiplying by 2 in the fraction part and reordering terms:
Replacing:
Part c
For this part we assume that the particle is a distance h above the surface at the begin and start with 0 velocity so then:
And after the particle reach the asteroid we have this:
So the balance of energy would be:
Replacing again instead of GM and dividing both sides by m we have:
And solving for v:
Multiplying both sides by two and taking square root:
Replacing