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3 years ago

Still don’t know what to do with this stuff

Physics

2 answers:

balandron [24]3 years ago

4 0

Answer:

what?

Explanation:

KonstantinChe [14]3 years ago

4 0

Answer:

brainly?

Explanation:

if you ment brainly i can help you?

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A stone is thrown vertically upwards with an initial velocity 20m/s. Find the maximum height it reaches and the time taken by it

Len [333]

Answer:

The maximum height it reaches will be 20 m.

The time taken by it to reach the height will be: t = 2 seconds.

Explanation:

We know the equation of the motion under gravity

v² - u² = 2gs

u = initial velocity = 20 m/s

v = final velocity = 0 m/s

$s\:=\:h_{max}$

$v^{2} \:-\:u^{2} \:=\:2gs$

substituting u = 20 m/s, v = 0 m/s, g = -10 and $s\:=\:h_{max}$

$\left(0\right)^2-\:\left(20\right)^2=\:2\left(-10\right)\times h_{max}$

$2\left(-10\right)\times h_{max}=-400$

$\frac{2\left(-10\right)h_{max}}{-20}=\frac{-400}{-20}$

$\:h_{max}=20$ m

Therefore, the maximum height it reaches will be 20 m.

We know the equation

u = gt

substitute u = 20, g = 10

20 = 10 × t

t = 20/10

t = 2 seconds

Therefore, the time taken by it to reach the height will be: t = 2 seconds.

3 0

3 years ago

An experimentalist fires a beam of electrons, creating a visible path in the air that can be measured. The beam is fired along a

gtnhenbr [62]

Answer:

Velocity of the electron in the beam.

Radius of the circulating electrons due to the magnetic field.

Explanation:

We have a Mathematical expression for the force on a moving charge in a magnetic field as:

$F=q.v.B.sin \theta$ ...........................(1)

where:

q= charge on the particle in coulomb

v= velocity of the charge projected into the magnetic field

B= intensity of the magnetic field in tesla

$\theta$ = angle between the velocity and direction of magnetic field

For the forces on rotating mass we have the formula:

$F=m.\frac{v^2}{r}$ ..........................................(2)

where:

m= mass of the charged particle

v= velocity of projection of charge into the magnetic field

r= radius of the path traced by the charge in the magnetic field

From eq. (1) and (2) we can calculate the magnetic field .

Now,

Using Ampere's Law we have:

$B = \frac{\mu_0 .I}{2 \pi r}$

where:

I= current in the wire

$\mu_0=$ The permeability of free space.

r= radial distance from the current carrying wire( in this case it is same as the radius of the circular path)

4 0

4 years ago

the video discusses four potential models of how the expansion of the universe changes with time. drag the correct model descrip

lapo4ka [179]

Only the coasting model makes the assumption that the universe's expansion pace never changes.

The current expansion of the cosmos is predicted by all four hypotheses.

Only the recollapsing model foresees the eventual contraction of the universe.

The average mass density of the cosmos is predicted to be exactly the critical density only under the critical model.

The cosmos is only predicted to be expanding more quickly than it did in the distant past by the accelerating model.

Cosmologists use observations of radiation released soon after the Big Bang to determine the expansion rate, often known as the Hubble constant.

Since the unexpected finding that the universe's expansion is speeding up in 1998, cosmologists have incorporated repulsive dark energy into their theory of cosmic development. The Hubble constant's inconsistent values might be resolved by early dark energy, an additional amount of dark energy present in the early cosmos. This early dark energy would have accelerated the universe's expansion by exerting external pressure.

To learn more about Universe expansion please visit-
brainly.com/question/16048709
#SPJ4

8 0

2 years ago

Salma is riding her bicycle. She rides 25.6 kilometers in 4 hours. What is her speed?

Musya8 [376]

Answer:

6.4 kilometers per hour

Explanation:

Just do the amount of distance she covers divided by how many hours she rides to get the answer. In this case, its 25.6 divided by 4 which equals 6.4

3 0

3 years ago

A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of 1.85 m/s2

Tasya [4]

Answer:

Coefficient of friction = 0.836

Explanation:

If v be the speed after one quarter of the circular path

v² = 2as = 2 x 1.85 x 2πr/4 ; v²/r = 1.85 x 3.14 = 5.8

tangential acceleration = 5.8 m/s²

radial acceleration = v² /r = 5.8

total acceleration = √2 x 5.8

m x√2 x 5.8 = m x g xμ

μ = √2 x 5.8 / 9.8 = 0.836

7 0

3 years ago