Two hockey players have a total momentum of +200 kg x m/s before a collision (+ is to the right). After the collision, they move
1 answer:
Total momentum after the collision: +200 kg m/s to the right
Explanation:
We can answer this question by using the law of conservation of momentum, which states that for an isolated system (=no external forces acting on the system), the total momentum is conserved.
Mathematically,
where
is the total momentum before the collision
is the total momentum after the collision
In this problem, the system consists of two hockey players. Before the collision, their total momentum is
(to the right)
Therefore, according to the law of conservation of momentum, their total momentum after the collision must be the same:
And given that the sign is +, the direction is still the same, therefore to the right.
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Answer:
The snail travel at the end of 5 s with a velocity of 12 m/s and the distance of the snail is 22.5 m.
Explanation:
Given that, the initial velocity of the snail is,
And the acceleration of the snail is,
And the time taken by the snail is,
Now according to first equation of motion,
Here, u is the initial velocity, t is the time, v is the final velocity and a is the acceleration.
Now substitute all the variables
Therefore, the snail travel at the end of 5 s with a velocity of 7 m/s.
Now according to third equation of motion.
Here, u is the initial velocity, a is the acceleration, s is the displacement, v is the final velocity.
Substitute all the variables in above equation.
Therefore the distance of the snail is 22.5 m.
The gravitational force would be
Explanation:
The magnitude of the gravitational force between two objects is given by
where
is the gravitational constant
m1, m2 are the masses of the two objects
r is the separation between them
In this case, we can write the gravitational force between the Moon and the Earth as:
where M is the Earth's mass and m is the Moon's mass.
We know that:
is their separation
is the force between them
So we can find:
Now, we are asked to find the gravitational force when the Earth and the Moon are separated by
In this case the new force would be
And substituting the values of (GMm) found previously and r', we find
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