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11Alexandr11 [23.1K]
3 years ago
6

If an object is not accelerating what can you determine about the sum of all the forces on the object

Physics
1 answer:
xxTIMURxx [149]3 years ago
8 0
If object is not accelerating, the sum of all forces on the object will be equal to ZERO...
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Which of the following statements best explains why a book resting on a table is in equilibrium?
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A train slows down as it rounds a sharp horizontal turn, going from 94.0 km/h to 46.0 km/h in the 17.0 s that it takes to round
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Answer:

1.41 m/s^2

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u = 94.0 km/h \cdot \frac{1000 m/km}{3600 s/h} = 26.1 m/s

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a_c=\frac{v^2}{r}

where

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a_c=\frac{(12.8 m/s)^2}{140 m}=1.17 m/s^2

we also have a tangential acceleration, which is given by

a_t = \frac{v-u}{t}

where

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Substituting values,

a_t=\frac{12.8 m/s-26.1 m/s}{17.0 s}=-0.78 m/s^2

The two components of the acceleration are perpendicular to each other, so we can find the resultant acceleration by using Pythagorean theorem:

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3 years ago
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A hydrogen atom in a galaxy moving with a speed of 6.65×106 m/???? away from the Earth emits light with a wavelength of 5.13×10−
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Answer:

The observed wavelength on Earth from that hydrogen atom is 5.24\times 10^{-7}\ m.

Explanation:

Given that,

The actual wavelength of the hydrogen atom, \lambda_a=5.13\times 10^{-7}\ m

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We need to find the observed wavelength on Earth from that hydrogen atom. The speed of galaxy is given by :

v=c\times \dfrac{\lambda_o-\lambda_a}{\lambda_a}

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So, the observed wavelength on Earth from that hydrogen atom is 5.24\times 10^{-7}\ m. Hence, this is the required solution.

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