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4 years ago

What observations tell you that a car is accelerating

Physics

1 answer:

professor190 [17]4 years ago

8 0

When the car moves and makes a sound that is louder that when the car is just sitting there

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Calculate the mass of 1.35 moles of sodium chloride (NaCl).

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Answer:d

Explanation:

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3 years ago

Determine the moment of inertia of a uniform solid sphere of mass M and radius R about an axis that is tangent to the surface of

Inessa05 [86]

Answer:

$I = \frac{7}{5}MR^2$

Explanation:

For answer this we will use the paralell axis theorem:

I= $I_{cm} + Md^2$

Where $I_{cm}$ is the moment of inertia of the center of mass, M is the mass of the sphere and d is the distance between the center of mass and the axis for rotate, then:

$I = \frac{2}{5}MR^2 +MR^2$

$I = \frac{7}{5}MR^2$

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3 years ago

Select the order in which the flow of current is listed from greatest to the least.

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Answer:

Short circuit, closed circuit, open circuit

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3 years ago

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Please answer this question.

mylen [45]

Nothings showing upppp

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3 years ago

A 10 g bullet is fired into, and embeds itself in, a 2 kg block attached to a spring with a force constant of 19.6 n/m and whose

dmitriy555 [2]

Answer:

$x=0.478\ m$ is the compression in the spring

Explanation:

Given:

mass of the bullet, $m=10\ g=0.01\ kg$

mass of block, $M=2\ kg$

stiffness constant of the spring, $k=19.6\ N.m^{-1}$

initial velocity of the spring just before it hits the block, $u=300\ m.s^{-1}$

<u>Now since the bullet-mass gets embed into the block, we apply the conservation of momentum as:</u>

$m.u=(M+m).v$

$0.01\times 300=(2+0.01)\times v$

$v=1.4925\ m.s^{-1}$

Now this kinetic energy of the combined mass gets converted into potential energy of the spring.

$\rm Kinetic\ energy=Spring\ potential\ energy$

$\frac{1}{2} (M+m).v^2=\frac{1}{2} k.x^2$

$\frac{1}{2} \times (2+0.01)\times 1.4925^2=\frac{1}{2} \times 19.6\times x^2$

$x=0.478\ m$ is the compression in the spring

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3 years ago

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