Power = energy / time
Multiply each side by 'time', then
divide each side by 'power':
Time = energy / power
Time = 432 / 75 = <em>5.76 seconds</em>
Answer: 45000 m/s^2
Explanation:
First, we know:
Bullet's Initial Velocity (Vo) = 0 m/s
Distance Travelled (D) = 1 m
Final Velocity (Vf) = 300 m/s
We need to know the bullets acceleration to reach the final velocity on that distance. Because the bullet stars from rest, his Initial Velocity is equal to zero.
We dont know on how much time it takes for the bullet, but we know the acceleration on the barrel is constant.
We can use the following equation for this
Because Vo is zero, the equation simplify, so we have.
Searching for the accelaration we obtain
Changing values
This is the acceleration needed to reach the velocity at the end of the barrel.
Answer:
-11776.36 N
This force is attractive since both charges are of opposite sign
Explanation:
Given that
Distance between the spheres = 2.73 cm =0.0273 m
where K is Coulomb's constant =
According to coulombs law we know that force between two charges is given by
This force is attractive since both charges are of opposite sign
Answer:
The statement is true but does not fully explain the situation.
Explanation:
- According to Newton's third law, a pair of equal and opposite forces is generated in every action and they of course cancel out when the system (the doer and the receiver are taken as a single system).
- According to the same law, one can work out the force-pairs that are generated during the push on the truck as follows.
- The friction force that applies to the truck is equal to the force applied to it by the person as the truck does not move.
- It is this friction force that keeps the truck stationary on the ground.
- To move the truck one should apply a force that is just above the static friction force that could apply to the truck from the ground at a given instance.
- Since the truck is massive, the static friction/ the maximum friction is also massive which a person could not imagine even applying.
- And that is why a push by a person does not move a massive truck.
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