When ball is thrown vertically upward. As it rises, what happens to its kinetic energy Kinetic energy decreases.
At the highest point, the kinetic energy is zero because all the kinetic energy is converted to potential energy. Therefore the kinetic energy is zero at the highest point. Kinetic energy is the energy that an object possesses due to its motion. Therefore, if an object is thrown straight up, its kinetic energy is zero at its maximum height.
An object thrown vertically upwards will be slowed down by the earth's gravity. Its speed decreases until it reaches a maximum altitude where the speed becomes zero. Gravity then accelerates it downward evenly. If you throw a ball into the air, it will point up, but gravity will slow it down. The ball is slowing down and has zero velocity at the top of its flight.
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Answer:
U₁ = 129.4 J
Explanation:
The potential energy is
U = mg y - m g y₀
Where I correspond to the initial position, with this it is an additive constant, we can make it zero with the placement of the reference system, in this case the system is placed on the floor where the ladder rests.
The power power for people on the floor is
U₀ = 0 J
The potential energy for the person on the first step is
U₁ = m g y₁
In general the steps are 20 cm high
y₁ = 20 cm (1m / 100cm) = 0.20 m
U₁ = 66 9.8 0.20
U₁ = 129.4 J
All of them are very expensive to install the machinery.
Nuclear energy has no particular negative effect while it's being
generated. But after the fuel is 'used up', and you can't get much
more energy out of it, it's still highly radioactive and dangerous to
people.
We still don't have a good, completely foolproof way to dispose of
the waste material, in a way that will protect people from it for as long
as it stays radioactive (can be thousands of years !).
Answer:
a. True
Explanation:
Metals are amazing, and they are all around us. You can probably easily identify them by their shiny surfaces and tinny sound when you tap them.
Generally, metals are mainly hard, shiny, and can be hammered into thin sheets. Also, another property of a metal is that, it is a good conductor of heat and even electricity because there valence (outer) electrons are delocalized. Some examples of chemical elements that are metals are iron, gold, sodium, silver, copper etc.