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3 years ago

Look at the pendulum diagram. at which point is the kinetic energy of the pendulum the greatest

Physics

2 answers:

damaskus [11]3 years ago

8 0

Position <em>' C '</em> is the middle of the swing. That's where the weight is the lowest.

It's also the place where the weight is moving the fastest, so that means it's the place where the kinetic energy is greatest.

Usimov [2.4K]3 years ago

5 0

Answer:

At point C

Explanation:

The velocity of the pendulum is maximum at its mean position, i.e., at C.

Formula for Kinetic energy is given by

$K = 1\div 2\times m\times v^{2}$

As velocity is maximum at C so kinetic energy is also maximum at C.

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In a TV set, an electron beam moves with horizontal velocity of 4.8 x 10^7 m/s across the cathode ray tube and strikes the scree

devlian [24]

Answer:

$5.32\times 10^{-16} m$

Explanation:

$Speed=\frac {distance}{time}$ hence making time the subject then

$Time=\frac {Distance}{Speed}$

Substituting 50 cm which is equivalent to 0.5 m for distance and velocity as given as $4.8*10^{7}$ we obtain

$Time=\frac {0.5}{4.8*10^{7}}=1.04167\times 10^{-8} s$

From kinematic equation

$s=ut+0.5gt^{2}$ and taking g as 9.81 then

$s=(0*1.04167\times 10^{-8} s)+(0.5*9.81*(1.04167\times 10^{-8} s)^{2})=5.32227\times 10^{-16} m$

$s\approx 5.32\times 10^{-16} m$

7 0

3 years ago

Soap bubble interference Light of 690-nm wavelength interferes constructively when reflected from a soap bubble having refractiv

Nikitich [7]

Answer:

The two possible thicknesses of the soap bubble is 129 nm and 389 nm.

Explanation:

Given that,

Wavelength = 690 nm

Refractive index = 1.33

We need to calculate the two possible thicknesses of the soap bubble

Using formula of thickness

$t=\dfrac{(m+\dfrac{1}{2})\lambda}{2n}$

For m = 0,

Put the value into the formula

$t=\dfrac{\dfrac{690\times10^{-9}}{2}}{2\times1.33}$

$t=129\times10^{-9}\ m$

$t=129\ nm$

For m=1,

Put the value into the formula

$t=\dfrac{\dfrac{3\times690\times10^{-9}}{2}}{2\times1.33}$

$t=389\times10^{-9}\ m$

$t=389\ nm$

Hence, The two possible thicknesses of the soap bubble is 129 nm and 389 nm.

5 0

3 years ago

Consider two identical springs. At the start of an experiment, Spring A is already stretched out 3 cm, while Spring B remains at

aksik [14]

Answer:

Explanation:

In this interesting exercise we have that spring A is 3 cm longer, due to previous experiments if these experiments did not reach the non-linear elongation point, the cosecant Km of the spring must remain the same, therefore when we lengthen the two springs these the longitudinal are lengthened.

As a consequence of the above according to Hockey law, the prediction of lengthening is the same, therefore the outside is the same in two two systems

F = K Δx

7 0

3 years ago

Why is measurement important?

Neko [114]

Answer:

Measurement is important so we could measure certain things right. By taking measurements we can have a knowledge of sizes, lengths, widths etc.

Explanation:

3 0

3 years ago

A submarine has a "crush depth" (that is, the depth at which

sergey [27]

Answer:

P =40.69 atm

Explanation:

We need to find the approximate pressure at a depth of 400 m.

It can be calculated as follows :

P = Patm + ρgh

Put all the values,

$P=1\ atm+1025 \times 9.81\times 400\times 9.8692\times 10^{-6}\ atm/Pa\\\\P=40.69\ atm$

So, the approximate pressure is equal to 40.69 atm.

3 0

2 years ago