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goblinko [34]
3 years ago
7

In a thought experiment, a scientist devised a system in which an object fell from a higher point to a lower point above the gro

und with no friction. Which statement about this system is correct?
The mechanical energy of the system at the beginning of the experiment is less than the mechanical energy of the system at the end of the experiment.

The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.

The total energy of the system was zero because there was no friction.

The mechanical energy of the system at the beginning of the experiment is greater than the mechanical energy of the system at the end of the experiment.
Physics
1 answer:
timofeeve [1]3 years ago
6 0

Answer:

A. The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.

Explanation:

I took the quiz and I put this answer and I got a 100%.

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Explanation:

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Two masses —m1 and m2— are connected by light cables to the perimeters of two cylinders of radii r1 and r2 respectively, as show
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Answer:

Part a)

Mass of m2 is given as

m_2 = \frac{20}{3} kg

Part b)

Angular acceleration is given as

\alpha = 1.96 rad/s^2

Part c)

Tension in the rope is given as

T = 176.6 N

Explanation:

Part a)

When m1 and m2 both connected to the cylinder then the system is at rest

so we can use torque balance here

m_1g r_1 = m_2 g r_2

20 g(0.5) = m_2 g(1.5)

10 = 1.5 m_2

m_2 = \frac{20}{3} kg

Part b)

When block m_2 is removed then system becomes unstable

so force equation of mass m1

m_1g - T = m_1 a

also we have

T r_1 = I\alpha

now we have

m_1g = \frac{I a}{r_1^2} + m_1 a

a = \frac{m_1g}{\frac{I}{r_1^2} + m_1}

a = \frac{20 (9.81)}{\frac{45}{0.5^2} + 20}

a = 0.981 m/s^2

so angular acceleration is given as

\alpha = \frac{a}{r_1}

\alpha = \frac{0.981}{0.5}

\alpha = 1.96 rad/s^2

Part c)

Tension in the rope is given as

T = \frac{I\alpha}{r_1}

T = \frac{45 (1.96)}{0.5}

T = 176.6 N

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4 years ago
The ball is pulled by a force called gravity. In what direction does gravity always pull the ball?​
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Answer:

Gravity always pulls the ball toward the center of earth (the ground).

Explanation:

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Answer:

average speed, accelerated speed

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A rocket has a mass 250 x (10^3) slugs on earth. Specify(a) its mass in SI units, and(b)its weight in SI units.If the rocket is
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Explanation:

It is given that,

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(b) Weight of the rocket is given by :

W = m g

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or

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Weight of the rocket on the moon is, W=mg

W=3647500\times 1.61

W = 5872475 N

or

W=5.8\times 10^6\ N

Hence, this is the required solution.                        

8 0
3 years ago
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