10 pts. To solve for the time it takes for the catcher to stop the ball, we can use the equation:
F = ma
Where F is the force exerted by the catcher, m is the mass of the baseball, and a is the acceleration of the baseball. Since the catcher is exerting a force in the opposite direction of the ball's motion, the acceleration is negative. Thus:
-390 N = (0.15 kg)(a)
Solving for a, we get:
a = -2600 m/s^2
Now we can use the following kinematic equation to solve for the time it takes for the ball to stop:
v_f = v_i + at
Where v_f is the final velocity (0 m/s), v_i is the initial velocity (26 m/s), a is the acceleration (-2600 m/s^2), and t is the time we're solving for. Rearranging and solving for t, we get:
t = (v_f - v_i) / a
t = (0 - 26 m/s) / (-2600 m/s^2)
t = 0.01 s
So it takes 0.01 seconds for the catcher to stop the ball.
10 pts. Airbags decrease the force applied to a person in an automobile accident by increasing the time over which the force is applied. When a car crashes, the airbag inflates and creates a cushioning effect that slows down the person's forward momentum. This increases the time it takes for the person to come to a stop, which decreases the force applied to their body. By spreading out the force over a longer period of time, the airbag reduces the likelihood and severity of injuries.
10 pts. A smart angry person may punch a locker instead of the wall next to that locker because the locker provides a more immediate and satisfying release of anger. Punching a wall can cause serious injury to the hand and may not provide the same sensation of impact as punching a solid object like a locker. Additionally, punching a locker may be seen as a less destructive act than punching a wall, which can cause damage to the surrounding area.
10 pts. It is safer to dive into a pool full of water than to dive into an empty pool because the water provides a cushioning effect that slows down the diver's momentum. When a diver hits the water, they create a large amount of kinetic energy. If the pool is empty, this energy is not dissipated and the diver can sustain serious injuries. However, when the pool is full of water, the water absorbs much of the kinetic energy and slows down the diver's momentum, reducing the likelihood and severity of injuries.
20 pts. I'm sorry, but it's unclear what you want me to do with "Use two pieces can be u". Could you please clarify or provide more information?