Physics, 23.03.2020 05:07 brenton14

A 10.0 kg block is at rest on a frictionless horizontal table. A student applies a constant 40.0 N force at an angle of 60.0 degrees, as shown in the figure below. The block remains in contact with the table as it is dragged along.
a) How far does the block move in 5.00 seconds? b) How much work is done by the applied force? c) What is the speed of the block after 5.00 seconds? d) What is the kinetic energy of the block after moving this distance? e) Compare the answers for b and d. If the answers are the same, explain. If they differ,
explain why they differ.

Answers: 2

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Answers

Answer from: mackaylabarnes22

See explanation.

Explanation:

The horizontal component of the force is

$F_x = 40*cos(60^o) \\\\\boxed{F_x = 20N.}$

And the acceleration that this force causes in the 10.0 kg block is

$a = \dfrac{F_x}{m}$

$a = \dfrac{20N}{10.0kg}$

$\boxed{a = 2ms^{-2}}$

(a).

The distance the block moves in time is

$D = \dfrac{1}{2}at^2;$

therefore, at t = 5.00s

$D = \dfrac{1}{2}(2)(5)^2$ ,

$\boxed{D = 25.}$

(b).

The work done by the applied force is

W = F_xD

putting in numbers we get:

$W = 20N* 25m\\\\\boxed{W = 500J}$

(c).

Those 500J of energy must appear as the kinetic energy of the block:

$\dfrac{1}{2}mv^2 = 500J$

solving for , we get:

$v = \sqrt{\dfrac{2*500J}{m} }$

$v = \sqrt{\dfrac{2*500J}{10kg} }$

$\boxed{v =10ms^{-1}}$

(d).

From (c), we know that the work done by he force must appear as the kinetic energy of the block; therefore, the kinetic energy of the block its 500J.

(e).

The kinetic energy of the block equals the work done by the force because of the law of conservation of energy, which here demands that the block cannot gain additional energy except that imparted by the force exerted on it.

Answer from: Quest

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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A 10.0 kg block is at rest on a frictionless horizontal table. A student applies a constant 40.0 N f...