Answer:
2nd option
Explanation:
total energy = kinetic energy + potential energy
and since
kinetic energy = 456J
total energy = 8768 J
substitute these values into the equation
8768 = 456 + potential energy
potential energy = 8312 J
hope this helps bro
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The statement that indicate the examples of resource depletion that can occur due to technology is option B which is Certain chemicals are released into the air by cars, leading to acid rain.
<h3>What is resource depletion?</h3>
Resources depletion is the process in which resources or raw materials are been destroyed or been exhausted due to several human activities or technologies thereby by leading to harmful effects on the health and livelihood of humans.
Therefore, The statement that indicate the examples of resource depletion that can occur due to technology is option B which is Certain chemicals are released into the air by cars, leading to acid rain.
Learn more about resource depletion below.
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Answer:
Yes, dimensionally the equation is correct.
Explanation:
This equation is the kinematic equation for uniformly accelerated motion, then we study the units of each member to conclude whether it is dimensionally correct.
vi = initial velocity [m/s]
a = acceleration [m/s^2]
t = time [s]
v = final velocity
therefore we have:
[m/s] + [m/s^2]*[t^2], the second term now is m/s
[m/s] + [m/s] = [m/s]
So the analysis is correct.
Answer:
Explanation:
Use the equation
where h(t) is the height after a certain amount of time goes by, v0t is the initial upwards velocity, and h0 is the initial height of the projectile. For us:
h(t) = 10
v0t = 80
h0 = 3 and filling in:
and get everything on one side to factor:
This factors to
t = .09 sec and 4.9 sec. Let's interpret this.
The time of .09 is when the ball reached 10 feet on the way up, and
the time of 4.9 is when the ball reached 10 feet on the way back down. That's the height we need, 4.9 seconds.
The
half-life of this radioactive isotope is 9 months for it decreases to
one-fourth its original amount in 18 months. Half-life means a certain length
of time after which half of the amount of radioactive element has decayed.
Therefore,
the half-life of this particular isotope is 18 months. After 18 months the
isotope was at one-half, then another 18 months, the isotope was at one-fourth,
which is 9 months where one-fourth is one-half of one half.