How can the solar energy be used as an alternative energy
1 answer:
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The final velocity is 1 m/s west
Explanation:
The problem can be solved by using the principle of conservation of momentum: in an isolated system, the total momentum of the system must be conserved before and after the collision. So we can write:
where:
is the mass of the first car
is the initial velocity of the first car (we take east as positive direction)
is the mass of the second car
is the initial velocity of the second car
is the final velocity of the two cars together after the collision
Re-arranging the equation and substituting the values, we find:
And since the sign is negative, the direction is to west.
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The potential energy of the lemming is 1.53 J
Explanation:
The potential energy (PE) of an object is the energy possessed by the object due to its position in the Earth's gravitational field, and it is given by:
where:
m is the mass of the object
is the acceleration of gravity
h is the height of the object relative to the ground
In this problem:
m = 0.0780 kg is the mass of the lemming
We want to find the potential energy when the height is
h = 2.00 m
Therefore, we find:
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