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3 years ago

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Physics

2 answers:

rodikova [14]3 years ago

7 0

Answer:

flip the cards over

Explanation:

Reptile [31]3 years ago

3 0

Answer:

click on the cards and you will get the answer

Explanation:

do it

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A fish cannot be killed by throwing an arrow into the water why?

olga55 [171]

Answer:

a fish cannot be killed by throwing an arrow into the water because you have to throw the arrow at the fish not just in the water….

Explanation:

common sense TwT

duhhh

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2 years ago

Read 2 more answers

A 2.5 kg , 20-cm-diameter turntable rotates at 150 rpm on frictionless bearings. Two 500 g blocks fall from above, hit the turnt

emmainna [20.7K]

The concepts required to solve this problem are those related to the conservation of the angular momentum and the moment of inertia of the disk. We will begin by calculating the moment of inertia of the disc, then the moment of inertia of the disc after the two two blocks hits and sticks to the edges of the turn table. In the end we will apply the conservation theorem.

The radius is given as,

$R = \frac{20cm}{2} = 10cm = 0.1m$

When a block falls from above and sticks to the turn table, the moment inertia of the turntable increases.

Since two blocks are stick to the turn table, the total final moment of inertia of the turntable is the sum moment of inertias of individual turntable, and two blocks.

$I_1 = \frac{1}{2} MR^2$

$I_1 = \frac{1}{2} (2.5)(0.1)^2$

$I_1 = 0.0125kg \cdot m^2$

The moment of inertia of each block is

$I_0 = mR^2$

Total moment of inertia of two block is

$I_0' = 2mR^2$

The final moment of inertia of the turn table is

$I_2 = I_1 +I'0$

$I_2 = I_1 +2mR^2$

$I_2 = 0.01kg\cdot m^2 + 2(500*10^{-3}kg)(0.1m)^2$

$I_2 = 0.0225kg\cdot m^2$

From the conservation of the angular momentum, the initial angular momentum of the system is equal to final angular momentum of the system,

Rearrange the equation we have that

$I_1\omega_2 = I_2\omega_2$

$\omega_2 = \frac{I_1\omega_2}{I_2}$

$\omega_2 = \frac{0.01*150rpm}{0.0225}$

$\omega_2 = 66.67rpm$

The magnitude of the turntable's angular velocity is 66.67rpm

3 0

3 years ago

The heat flux for a given wall is in the x-direction and given as q^n = 11 W/m^2, the walls thermal conductivity is 1.7 W/mK and

MrMuchimi

Answer:

$\frac{dT}{dx} = 6.47 ^oC/m$

Also as we can see the equation that heat flux directly depends on the temperature gradient so more is the temperature gradient then more will be the heat flux.

For positive temperature gradient the heat will flow outwards while for negative temperature gradient the heat will flow inwards

Explanation:

As we know that heat flux is given by the formula

$q^n = K\frac{dT}{dx}$

here we know that

K = thermal conductivity

$\frac{dT}{dx}$ = temperature gradient

now we know that

$q^n = 11 W/m^2$

also we know that

K = 1.7 W/mK

now we have

$11 = 1.7 \frac{dT}{dx}$

so temperature gradient is given as

$\frac{dT}{dx} = \frac{11}{1.7} = 6.47 K/m$

also in other unit it will be same

$\frac{dT}{dx} = 6.47 ^oC/m$

Also as we can see the equation that heat flux directly depends on the temperature gradient so more is the temperature gradient then more will be the heat flux.

For positive temperature gradient the heat will flow outwards while for negative temperature gradient the heat will flow inwards

5 0

3 years ago

g An object with mass m=2 kg is completely submerged, and tethered, to the bottom of a large body of water. If the density of th

Anit [1.1K]

Answer:

The tension in the rope is 20 N

Solution:

As per the question:

Mass of the object, M = 2 kg

Density of water, $\rho_{w} = 1000\ kg/m^{3}$