Compressed air is used to fire a 60 g ball vertically upward from a 0.70-m-tall tube. The air exerts an upward force of 3.0 N on the ball as long as it is in the tube. Part A How high does the ball go above the top of the tube

2.87 m

Explanation:

Given:

Mass of the ball (m) = 60 g = 0.06 kg

Height of the tube (h) = 0.70 m

Upward force by compressed air on the ball (F) = 3.0 N

Initial velocity of the ball (u) = 0 m/s (Assume)

Final velocity of the ball at the end of tube (v)  = ?

Acceleration of the ball (a) = ?

Weight of the ball is equal to the product of mass and gravity. So,

Weight (W) =

Therefore, the net force acting on the ball is equal to the difference of upward force and downward force. So,

Net force = Force by air - Weight

Now, from Newton's second law, the net force is equal to the product of object's mass and acceleration. So,

Now, acceleration (a) = 40.2 m/s²

Using equation of motion, we have:

Now, let the maximum height reached be 'H'.

So, applying energy conservation from the top of pipe to the maximum height.

Decrease in kinetic energy = Increase in potential energy.

Plug in the given values and solve for 'H'. This gives,

Therefore, the ball reaches a height of 2.87 m above the top of the tube.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.