Which of these forces could result in simple harmonic motion? the positive values of f(x) correspond to the forces acting in the positive x direction. select all that applya. f(x)=−9(x−6)1/2b. f(x)=9x1/2c. f(x)=−9x1/2d. f(x)=9xe. f(x)=−9xf. f(x)=−9x+6

Harmonic motion is the oscillating motion. Options D and E are correct.

From Hooke's Law,

Where,

- Spring constant

- displacement

Therefore, option D and E shows the simple harmonic motion.

Learn more about Simple Harmonic motion:

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E.F(x )= - 9 x

F.F(x )= - 9 x + 6

Explanation:

    Given that

F(x )=  9 x

F(x )= - 9 x

F(x )= - 9 x + 6

We know that ,for simple harmonic motion

F= - k x

k=constant

The power of x should be one.We can say that it is linear equation between force and displacement x.The force is proportional to the displacement but in the opposite direction.

Therefore the following forces shows the harmonic motion.

F(x )= - 9 x

F(x )= - 9 x + 6

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.