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ss7ja [257]
4 years ago
13

1. Define the following vocabulary terms:

Physics
1 answer:
ehidna [41]4 years ago
3 0

a) Speed: It is the ratio of distance covered and time interval to cover that distance

it is given as speed = \frac{distance}{time}

b) Direction: it will define for vector quantities and shows the required direction for it

c) Velocity : It is rate of change in position or it is ratio of displacement and time

d) Vector : it is a type of physical quantity which will be defined by magnitude and direction both

e) Position : it is defined as the distance with respect to a given reference or origin

f) Acceleration : it is defined by rate of change in velocity.

a = \frac{v_f - v_i}{\Delta t}

g) Force = it is push or pull on an object which will create acceleration to the object

F = ma

it is product of mass and acceleration

h) Newton : it is SI unit of force or we measure force in this unit

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A 1200 kg truck is moving to the right at the speed of 30 m/s. It hit another identical truck that was at rest. The two trucks s
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Answer:

ok wht is the question

Explanation:

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3 years ago
A mass of 5kg starts from rest and pulls down vertically on a string wound around a disk-shaped, massive pulley. The mass of the
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Answer:

1.98 m/s

Explanation:

To solve this, we would be using the law of conservation of energy, i.e total initial energy is equal to total final energy.

E(i) = E(f)

mgh = ½Iw² + ½mv²

Recall, v = wr, thus, w = v/r

Also, I = ½mr²

I = 0.5 * 5 * 2²

I = 10 kgm²

Remember,

mgh = ½Iw² + ½mv²

Substituting w for v/r, we have

mgh = ½I(v/r)² + ½mv²

Now, putting the values in the equation, we have

5 * 9.8 * 0.3 = ½ * 10 * (v/2)² + ½ * 5 * v²

14.7 = 1.25 v² + 2.5 v²

14.7 = 3.75 v²

v² = 14.7/3.75

v² = 3.92

v = √3.92

v = 1.98 m/s

Thus, the speed is 1.98 m/s

5 0
3 years ago
How do professional bicycle riders reduce friction. Name two ways.<br> Thx
wlad13 [49]
A well maintained bicycle is key.  Oil the chain so that it's less likely to get hung up.  It will have a smoother flow.  Another could be in their clothing.  Notice they usually wear good fitting clothing?  I believe the more from fitting pants help clothing friction.  Another way could be keeping the tires well inflated so that the tires aren't dragging.  Rolling along smoothly on properly inflated tires seems like a must.  Get a few more answers along with mine, so that you have a variety to choose from.
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4 years ago
What is the thinnest film of MgF₂ (n = 1.38) on glass that produces a strong reflection for orange light with a wavelength of 60
marysya [2.9K]

Answer:

Thickness is 217 nm

Explanation:

For a thin film, constructive and destructive interference each has its own effects. Here constructive interference causes the light to be strongly reflected.  The thickness can be determined from

2\times t\times n \times sin\theta=m\lambda

here n is refractive index 1.38, m=1 , \theta=0, \lambda=600 nm

t=\frac{600 \times 10^{-9}}{2\times 1.38} \\t=217 nm

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The forces acting on a leaf are
otez555 [7]

Affected plants

Explanation:

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