First example: book, m= 0.75 kg, h=1.5 m, g= 9.8 m/s², it has only potential energy Ep,
Ep=m*g*h=0.75*9.8*1.5=11.025 J
Second example: brick, m=2.5 kg, v=10 m/s, h=4 m, it has potential energy Ep and kinetic energy Ek,
E=Ep+Ek=m*g*h + (1/2)*m*v²=98 J + 125 J= 223 J
Third example: ball, m=0.25 kg, v= 10 m/s, it has only kinetic energy Ek
Ek=(1/2)*m*v²=12.5 J.
Fourth example: stone, m=0.7 kg, h=7 m, it has only potential energy Ep,
Ep=m*g*h=0.7*9.8*7=48.02 J
The order of examples starting with the lowest energy:
1. book, 2. ball, 3. stone, 4. brick
Answer:
1.because of the heat produced by the socat
2. they should have control how they placed the heater
3. because the water is to much
4.because is different from the question
5. because that is how the question is
Both objects have the same electrical charge. Opposite charges attract. And if they were neutral they would not do anything.
The way I look at these things is like this:
-- The runner covered 12 meters in 4 seconds.
Average speed = 3 meters per second.
-- Speed at the beginning = zero.
In order to make the average 3, Speed at the end = 6 meters per second.
-- Speed increased from zero to 6 meters per second in 4 seconds.
It must have increased 1.5 meters per second each second.
That's choice-#2.
The first image below shows force F1 and the axes.
Answer:
3.62 kN
Explanation: The second figure below express the parallelogram method to calculate the u component of force F1.
The <u>Parallelogram</u> <u>Method</u> is a method to determine resultant force and is applied as described in the question above.
With the three components,
and
and angles, it can be used the <u>Law</u> <u>of</u> <u>Sines</u>, which states:

i.e., there is a relation of proportionality between an angle and its opposite side.
For the triangle below:



u = 3.62
The magnitude of the component acting along the u-axis is 3.62kN.