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3 years ago

PHYSICS! I AM TIMED!

Physics

2 answers:

Lana71 [14]3 years ago

8 0

28J because mechanical energy is the sum of the potential energy and kinetic energy

ludmilkaskok [199]3 years ago

3 0

Answer:

28 J, because mechanical energy is the sum of the potential energy and kinetic energy .

Explanation:

Mechanical energy is the combination of the kinetic and potential energy.

Kinetic energy is the energy that an object will have due to its motion.

Whenever an object's state or position is considered, it is called potential energy. For example, a bird sitting on top of a tree at some height is said to possess potential energy.

Whenever an object has velocity, it will have kinetic energy.

It is maximum when the potential energy is a minimum or zero, when total energy of an object or a system is conserved.

Similarly, whenever an object or a system has maximum potential energy, its kinetic energy is a minimum or zero.

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Eddi Din [679]

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5 0

3 years ago

Hi If the coefficient of kinetic friction between the 5.0 kg mass and the table is 0.305, what is the tension in the string?

statuscvo [17]

Answer:

18 N

Explanation:

Draw a free body diagram for each block.

There are four forces acting on block I:

Weight force Mg pulling down

Normal force N pushing up

Tension force T pulling right

Friction force Nμ

There are two forces acting on block II:

Weight force mg pulling down

Tension force T pulling up

Sum of forces on block I in the +y direction:

∑F = ma

N − Mg = 0

N = Mg

Sum of forces on block I in the +x direction:

∑F = ma

T − Nμ = Ma

T − Mgμ = Ma

Sum of forces on block II in the -y direction:

∑F = ma

mg − T = ma

Solve for a in the first equation, then substitute into the second.

a = (T − Mgμ) / M

mg − T = m (T − Mgμ) / M

mMg − MT = mT − mMgμ

mMg + mMgμ = mT + MT

mMg (1 + μ) = (m + M) T

T = mMg (1 + μ) / (m + M)

T = (2) (5) (9.8) (1 + 0.305) / (2 + 5)

T = 18.27

Rounding to two significant figures, the tension is 18 N.

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3 years ago

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Answer:

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3 years ago