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Tju [1.3M]
3 years ago
12

We cannot consider something to be work unless

Physics
2 answers:
iren [92.7K]3 years ago
5 0
<span>force applied causes movement of an object in the same direction as the applied force.</span>
kari74 [83]3 years ago
5 0

Explanation:

The product of applied force and the displacement is called the amount of work done by an object. For the work to be done the force and the displacement are two important factors. The mathematical expression for the work done is given by :

W=Fd\ cos\theta

Where

\theta is the angle between applied force and the displacement

When \theta=90, W = 0

\theta=0, W = F d

\theta=180, W = -F d

So, we cannot consider something to be work unless force applied causes movement of an object in the same direction as the applied force. Hence, this is the required solution.

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1. A kangaroo hops 84 m to the east in 7 seconds.
DENIUS [597]

Explanation:

Given parameters:

Distance hopped  = 84m

Displacement  = 84m due east

Time  = 7s

Unknown:

Speed of kangaroo  = ?

Velocity of kangaroo  = ?

Solution:

To solve this problem,

    Speed  = \frac{distance}{time }   = \frac{84}{7}  = 12m/s

  Velocity  = \frac{displacement}{time}   = \frac{84}{7}   = 12m/s due east

3 0
3 years ago
What are dot diagrams in Physical Science?​
s344n2d4d5 [400]

Answer:

If you mean Lewis dot diagrams, aka electron-dot diagrams, then these are diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that may exist in the molecule.

Explanation:

6 0
3 years ago
Rama's weight is 4okg: She is carrying a load of 20kg up to a height of 20 meters.what work does she do?Also mention its type of
Maslowich

Answer:

rama is doing

Explanation:

work done=f×d×g

=60×20×9.8

=11760j

she is doing work against gravity

mark me

8 0
3 years ago
What is the longest wavelength of light that will emit electrons from a metal whose work function is 3.70 eV
SSSSS [86.1K]

Answer:

h f = Wf + K

where the total energy available is h f, Wf is the work function or the work needed to remove the electron and K is the kinetic energy of the removed electron

If K = zero then hf = Wf

Wf = h f = h c / λ    or

λ = h c / Wf = 6.63E-34 * 3.0E8 / (3.7 * 1.6E-19)

λ = 6.63 * 3 / (3.7 * 1.6) E-7 = 3.36E-7

This would be 3360 angstroms or 336 millimicrons

Visible light = 400-700 millimicrons

6 0
2 years ago
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Not very y’all..........
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2 years ago
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