Answer:
B. The force would be the same in both cases.
Explanation:
According to Newton's 3rd law where impulse was equated to the momentum formula.
F × t = M × V
where,
Force = F
V = velocity
Since, Impulse is force multiplied by time, whereas the time of contact is the same for both, therefore the impulse is the same in magnitude for the two trucks.
Case 1: Hitting the other car
Case 2: Hitting the brick wall
In Case 1, both the cars are identical and have same velocity whereas in the Case 2, the wall is stationary.
The case of hitting the brick wall have the same impact force as hitting the other car, because they have the same change in momentum.
Therefore, The force would be the same in both cases.
Answer:
60 J
Explanation:
KE = ½ mv²
KE = ½ (0.3 kg) (20 m/s)²
KE = 60 J
temperature rises ? specific heat capacity etc ...
The force with which the student is acting in the chair and the force of the chair acting on the student is 588 N
Explanation:
- There are two kinds of forces acting on you when you are sitting on the chair, they are the gravitational force and the force exerted by the chair on you.
- The forces acting on the chair when you are sitting are the gravitational force and the force exerted by you.
- As per Newton's third law of motion, for every action, there is an equal and opposite reaction.
- Hence, F = ma
that is, F = 60 * 9.8
=588 N
- So, 588 N force should be applied from both sides then only you can sit properly in the chair.
