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3 years ago

In a closed system, _____ energy is equal to potential energy plus kinetic energy.

Physics

2 answers:

Blizzard [7]3 years ago

7 0

Answer: The correct answer is mechanical energy.

Explanation:

Kinetic energy is due to the motion of the object.

Potential energy is the energy due to the position of the object.

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

The expression of the mechanical energy is as follows:

ME= KE+ PE

Here. KE is the kinetic energy and PE is the potential energy.

In a closed system, mechanical energy is equal to potential energy plus kinetic energy. According to the conservation law of mechanical energy,the total mechanical energy of the system is conserved in a closed system.

Kobotan [32]3 years ago

4 0

The answer is mechanical

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Heat is extracted from a certain quantity of steam at

vodomira [7]

Answer: $v=2452.91 m/s$

Explanation:

Given

initially steam is at $100^{\circ}C$ and converted to $0^{\circ} C$ ice

Let m be the mass of steam

latent heat of fusion and vaporization for water is

$L_f=3.33\times 10^5 J/kg$

$L_v=2.26\times 10^6 J/kg$

Heat required to convert steam in to water at $100^{\circ}C$

$Q_1=m\times L_v=m\cdot 2.26\times 10^6 J$

Heat required to lower water temperature to $0^{\circ}C$

$Q_2=m\times c\times \Delta T$

$Q_2=m\times 4.184\times (100)$

$Q_2=4.184m\times 10^5 J$

Heat required to convert $0^{\circ}C$ water to ice at $0^{\circ}C$ is

$Q_3=m\times L_f$

$Q_3=m\times 3.33\times 10^5=3.33m\times 10^5 J$

$Q=Q_1+Q_2+Q_3$

$Q=(2.26+0.4184+0.33)m\times 10^6 J$

$Q=3.0084m\times 10^6 J$

So this energy is equal to kinetic energy of bullet of mass m moving with velocity v

$Q=\frac{1}{2}mv^2$

$3.0084m\times 10^6=\frac{1}{2}mv^2$

$v^2=3.0084\times 2\times 10^6$

$v=2.452\times 10^3 m/s$

$v=2452.91 m/s$

5 0

3 years ago

PLEASE HELP I WILL GOVE BRAINLIEST TO FIRST CORRECT ANSWER!!!!!

Dmitrij [34]

Answer is C is the correct answer

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3 years ago

A ladybug sits 14 cm from the center of a turntable spinning at 33.33 rpm. The Sun is shining horizontally through the window an

kolbaska11 [484]

Answer:

The maximum velocity is 0.489 m/s

Explanation:

Maximum velocity (v) = angular velocity (w) × radius (r)

w = 33.33 rpm = 33.33×0.1047 = 3.4897 rad/s

r = 14 cm = 14/100 = 0.14 m

v = 3.4897×0.14 = 0.489 m/s

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2 years ago

If something changes motion, are forces balanced or unbalanced?

ololo11 [35]

When the motion of an object changes, the forces are unbalanced. Balanced forces are equal in size and opposite in direction. ... When the forces on an object are equal and in opposite directions, the forces are balanced, and there is no change in motion.

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2 years ago

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HACTEHA [7]

Answer:

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