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3 years ago

Give the reason to the order

Physics

2 answers:

Nimfa-mama [501]3 years ago

5 0

Answer: the ordering is justified by calculating the corresponding temperature differences and sorting in descending order.

Explanation:

The energy exchange rate is a function of the temperature difference between two parts (here the sphere and the surroundings). The larger the difference the higher the rate of exchange.

The differences are as follows:

A: 65 degrees --> second highest rate of energy transfer

B: 80 degrees --> highest rate of energy transfer

C: 60 degrees --> lowest rate

Therefore, the ordering will be B->A->C

Luba_88 [7]3 years ago

4 0

This is simple it is because B has the greatest ammount of energy being transfered, A has the second most, and C has the least ammount being transferred.

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Answer:

Given that

T= 0.43 s

Radius of the ball path's , r=2.1 m

We know that

f= 1/T

Here f= frequency

T= Time period

Now by putting the values

f= 1/T

T= 0.43 s

f= 1/0.43

f=2.32 Hz

We know that

V= ω r

ω = 2 π f

ω=Angular speed

V= Linear speed

ω = 2 π f=ω = 2 x π x 2.32 =14.60 rad/s

V= ω r= 14.60 x 2.1 = 30.66 m/s

Acceleration ,a

a =ω ² r

a= 14.6 ² x 2.1 = 447.63 m/s²

We know that g = 10 m/s²

a= a/g= 447.63/10 = 44.7 g m/s²

a= 44.7 g m/s²

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3 years ago

A rock is thrown upwards and has a max altitude of 40 m. What was its initial velocity?

Natali [406]

Recall the formula,

${v_f}^2-{v_i}^2=2a\Delta x$

where $v_i$ and $v_f$ are the rock's initial and final velocities, respectively; $a$ is its acceleration; and $\Delta x$ is the displacement it undergoes.

At any point during its motion, the rock is subject to gravity, so $a=-g$ , where $g=9.80\frac{\rm m}{\mathrm s^2}$ . At its maximum height, the rock has zero vertical velocity, and if we take its starting height to be the origin, we have $\Delta x=x_{\rm max}$ .

So,

$0^2-{v_i}^2=-2gx_{\rm max}\implies-{v_i}^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)(40\,\mathrm m\implies\boxed{v_i=28\dfrac{\rm m}{\rm s}}$

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Yuri [45]

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cricket20 [7]

Answer:

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