Answer:
Speed of larger piece is 
Explanation:
We apply the principle of conservation of momentum.
The watermelon is initially at rest. The initial momentum = 0 kg m/s in all directions.
After the collision,
Vertical momentum = momentum of piece in y-direction + y-component of momentum of larger piece = 
Here,
is the y-component of velocity of larger piece.
This is equal to 0, since the initial momentum is 0.

Horizontal momentum = momentum of piece in x-direction + x-component of momentum of larger piece = 
Here,
is the x-component of velocity of larger piece.
This is also equal to 0, since the initial momentum is 0.

The velocity of the larger piece,
, is the resultant of
and
. Since they are mutually perpendicular,


Answer:
40 J
Explanation:
= 4 C
= 2 C
= 20 J
The potential energy is directly proportional to the charge of the particle


The potential energy expected is 40 J
Answer:
True: For a sound wave to propagate, air particles must be displaced in the direction of propagation - it is the displacement of these particles that causes the eardrum to vibrate and recognize the sound.
Answer:
d. None of the above.
Explanation:
In a parabolic motion, you have that in the complete trajectory the component velocity is constant and the vertical component changes in time. Then, the total velocity vector is not zero.
In the complete trajectory the gravitational acceleration is always present. Then, the grasshopper's acceleration vector is not zero.
At the top of the arc the grasshopper is not at equilibrium because the gravitational force is constantly acting on the grasshopper.
Then, the correct answer is:
d. None of the above.
Average speed of the driver is given as

if he moved for total time t = 3.5 hours
so the distance between the tow is given as



so the distance between St. Louis and Chicago is 224 miles