The initial kinetic energy of the boat and its rider is
After Sam stops it, the final kinetic energy of the boat+rider is
because its final velocity is zero.
For the law of conservation of energy, the work done by Sam is the variation of kinetic energy of the system:
where the negative sign is due to the fact that the force Sam is applying goes against the direction of motion of the boat.
Storage form of energy:
- Potential energy
- Nuclear energy
- electrical energy
- thermal energy
- magnetic energy
Potential energy:
All stationary objects are having potential energy stored in it. This energy can be transferred in form of kinetic energy when it comes in the motion from rest. Example, An object placed at height h having potential energy in it. When it comes in motion from the rest the potential energy is converted into kinetic energy.
Nuclear energy:
Nuclear energy is energy that is stored in nucleus of any element. Example, fusion reaction on sun gives earth solar energy.
Electric energy:
Electrical energy is due to movement of the electrical charges. Example, In elctrical batteries electrical energy is stored.
Thermal energy:
Thermal energy is the internal energy of a substance that is transferred to other substance in the form of heat. Example, on heating water is a beaker stem energy is developed.
Magnetic energy:
Magnetic energy is the potential energy stored in the magnetic field. Example, using magnetic energy electric field is produced according to Faraday's law.
Answer:
v = 7.18_m/s
Explanation:
Velocity of the earth towards the ball is = velocity of the ball moving towards earth
For object in free fall, we have
Where
v = final velocity
u = initial velocity
g = acceleration due to gravity
t = time
S = height of ball above ground
v^2 = u^2 - 2×g×(-S)
= 0 + 2×9.8×2.63 = 51.55_m^2/s^2
Velocity of the ball just before it hits the ground is
v = 7.18_m/s
Answer:
A) motion parallax
Explanation:
Motion parallax is a visual perception while we are in motion with respect to our surrounding in which the surroundings objects nearer to our eyes appear to move or pass at a faster pace than the objects farther to our eyes during the motion.
This can also be understood as the angular displacement of the objects while our motion. The objects nearer to our eyes have a rapid change in the angular position than the objects far away from us.
Answer: 39.08664m
Normal free fall:
2s = 19.6133m/s
1s = 9.08665m/s
Assuming there's no air resistance:
The first second of the fall it will travel 15m
since the initial speed of the ball is 15m/s
this leaves us with 1 second, however by the time the ball ha traveled 1 second it will be accelerated by the force of gravity (9.08665)
15 + 9.08665 = 24.08665
We're already travelled 15m
and now 24.08665 will be covered in
the last second.
24.08665 + 15 = 39.08664m
-/
if we're gonna be technical:
a coins terminal velocity is only roughly around 19km/s so it wouldn't even travel much
(a brainliest would be appreciated)