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kondaur [170]
4 years ago
14

explain how fossil records of the past are reliable sources of information about evolution of life on Earth.

Physics
1 answer:
Tema [17]4 years ago
4 0
Because the fossil show layers and those layers show what kind of settlements where left behind at that layer
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An electric motor rotating a workshop grinding wheel at 1.00 × 10² rev/min is switched off. Assume the wheel has a constant nega
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An electric engine turning a workshop sanding rotation at 1.00 × 10² rev/min is switched off. Take the wheel includes a regular negative angular acceleration of volume 2.00 rad/s². 5.25 moments long it takes the grinding rotation to control.

<h3>What is negative angular acceleration?</h3>
  • A particle that has a negative angular velocity rotates counterclockwise.
  • Negative angular acceleration () is a "push" that is hence counterclockwise.
  • The body will speed up or slow down depending on whether and have the same sign (and eventually go in reverse).
  • For instance, when an object rotating counterclockwise slows down, acceleration would be negative.
  • If a rotating body's angular speed is seen to grow in a clockwise direction and decrease in a counterclockwise direction, it is given a negative sign.
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Let t be the time taken to stop.

ω = 0 rad/s

Use the first equation of motion for rotational motion

ω = ωo + α t

0 = 10.5 - 2 x t

t = 5.25 second

To learn more about angular acceleration, refer to:

brainly.com/question/21278452

#SPJ4

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The electric force between two charged objects depends on which of the following
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Suppose that in an alternate universe, the possible values of l are the integer values from 0 to n (instead of 0 to nâ1). assumi
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Answer:

    level     possible values of ℓ     possible values of m     number of orbitals

    n = 1        0, 1                                 -1, 0, 1                                      3

    n = 2       0, 1, 2                             -2, - 1, 0, +1, +2                       5

    n = 3       0, 1, 2, 3                         -3, -2, -1, 0, +1, +2, +3            7    

    n = 4        ...                                    ...                                            9

    n = 5       ...                                    ...                                            11


Explanation:


1. This question is about the quantum numbers: n, ℓ, m, s.


2. n is the principal quantum number, i.e. amin energy level. It can be any positive integer: 1, 2, 3, 4, 5, 6, 7 ...


3. ℓ is the azimuthal quantum number. The possible values of ℓ are from 0 to n - 1.


4. It is stated that in the alternate universe the possible values of ℓ are from 0 to n, instead of o to  n - 1, and that all the other rules are still valid.


5. Since, two electrons in the same atom cannot have the same set of four quantum numbers, and the spin number can only be +1/2 or -1/2, the number of possible orbitals is equal to the amount  of possible ℓ numbers.


That implies that you can build the table with the possible number of orbitgals in each level:


    level     possible values of ℓ     possible values of m     number of orbitals

    n = 1        0, 1                                 -1, 0, 1                                      3

    n = 2       0, 1, 2                             -2, - 1, 0, +1, +2                       5

    n = 3       0, 1, 2, 3                         -3, -2, -1, 0, +1, +2, +3             7    

    n = 4        ...                                    ...                                            9

    n = 5       ...                                    ...                                            11

   n = 6        ...                                    ...                                            13

   n = 7        ...                                    ...                                            15




5 0
4 years ago
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