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3 years ago

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A train crew was cleaning out a rail tanker that had been emptied of its contents. They rinsed the rail car out with scalding ho

t water through a port of the bottom of the rail car. When they were finished and had drained the water out they shut the valve of the port and went home for the day. During the night the temperature droppe d and it was very cold outside. When they came back to the work the next night something happens to the rail car!

1 answer:

gizmo_the_mogwai [7]3 years ago

7 0

Answer:

...............

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Two horizontal rods are each held up by vertical strings tied to their ends.

IgorLugansk [536]

Answer:

a. Rod 1.

Explanation:

Below ia an attachment containing the solution.

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A ball rolling on grass has more friction than a ball rolling on tile

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Answer:

When you slide an object there is less friction than when you roll it. an object's acceleration (change in speed) depends on the mass of the object and the amount of force applied on it. an object at rest stays at rest unless a force acts on it. ... A ball rolling on grass has more friction than a ball rolling on tile.

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3 years ago

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An 20-cm-long Bicycle Crank Arm. With A Pedal At One End. Is Attached To A 25-cm-diameter Sprocket, The Toothed Disk Around Whic

malfutka [58]

To solve the problem, it is necessary to apply the concepts related to the kinematic equations of the description of angular movement.

The angular velocity can be described as

$\omega_f = \omega_0 + \alpha t$

Where,

$\omega_f =$ Final Angular Velocity

$\omega_0 =$ Initial Angular velocity

$\alpha =$ Angular acceleration

t = time

The relation between the tangential acceleration is given as,

$a = \alpha r$

where,

r = radius.

PART A ) Using our values and replacing at the previous equation we have that

$\omega_f = (94rpm)(\frac{2\pi rad}{60s})= 9.8436rad/s$

$\omega_0 = 63rpm(\frac{2\pi rad}{60s})= 6.5973rad/s$

$t = 11s$

Replacing the previous equation with our values we have,

$\omega_f = \omega_0 + \alpha t$

$9.8436 = 6.5973 + \alpha (11)$

$\alpha = \frac{9.8436- 6.5973}{11}$

$\alpha = 0.295rad/s^2$

The tangential velocity then would be,

$a = \alpha r$

$a = (0.295)(0.2)$

$a = 0.059m/s^2$

Part B) To find the displacement as a function of angular velocity and angular acceleration regardless of time, we would use the equation

$\omega_f^2=\omega_0^2+2\alpha\theta$

Replacing with our values and re-arrange to find $\theta,$

$\theta = \frac{\omega_f^2-\omega_0^2}{2\alpha}$

$\theta = \frac{9.8436^2-6.5973^2}{2*0.295}$

$\theta = 90.461rad$

That is equal in revolution to

$\theta = 90.461rad(\frac{1rev}{2\pi rad}) = 14.397rev$

The linear displacement of the system is,

$x = \theta*(2\pi*r)$

$x = 14.397*(2\pi*\frac{0.25}{2})$

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3 years ago

Galileo galilei was the first scientist to perform experiments in order to test his ideas. He was also the first astronomer to s

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Answer:

Galileo four key observations are

1. Jupiter has orbiting moons.

2. The Sun has sunspots and rotates on its axis.

3. The Moon has mountains, valleys, and craters.

4. Venus goes through a full set of phases.

Explanation:

The above are Galileo's observations that went against the geocentric model and the general beliefs about the universe at the time.

His most critical observation was when he stated that planet Venus is different phases; this observation has a direct impact on the notion that objects orbit the Sun but not the Earth.

He went further to state his observations that the Sun and Moon had surface rough and imperfect surface. This observation disproved the idea that the moon and the Sun had perfect surfaces.

Galileo's observations of Jupiter's orbiting moons showed that there were other centers of motion in the universe.

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3 years ago