Answer:
Explanation:
ignoring air resistance, the kinetic energy at water impact will equal the potential energy converted
½mv² = mgh
v = √(2gh)
v = √(2(9.81)2.1) = 6.4188... m/s
after impact, an impulse will result in a change of momentum.
There is a downward impulse due to gravity equal to the weight of the stone and an upward average force due to water resistance and buoyancy force.
FΔt = mΔv
(F - mg)Δt = m(vf - vi)
(F - mg) = m(vf - vi)/Δt
F = m(vf - vi)/Δt + mg
F = m((vf - vi)/Δt + g)
F = 1.05(((½(-6.4188) - -6.4188)/ 1.83) + 9.81)
F = 12.14198...
F = 12.1 N
It occurs when energy is supplied or withdrawn :)
7. The nineteenth amendment protects the right to vote of 18 year old women.
8.The 24th amendment eliminated poll taxes and increases voting rights in the United States.
9.National voter Registration allowed the option for adults to register vote when they obtain or renew a driver's license.
10.Three steps in voting process are registering to vote, preparing to vote and casting a ballot.
11.The statement that was not an effect of the United States Supreme Court's ruling in Bush vs Gore is Tennessee's electoral collage votes went to Al Gore.
12.The general election requires the United States choose a president
13.The type of election that is held to fill a public office that is left vacant when an official resigns is special election.
14.The position that a person actually vote for when a voter chooses a candidate for president is an elector in the elector college.
15.A possible candidate for president would form an exploratory committee to see how much support he or she can expect.
A motion where gravity is the only force acting upon it
Answer:
<h2>441 J</h2>
Explanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 30 × 9.8 × 1.5
We have the final answer as
<h3>441 J</h3>
Hope this helps you
