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3 years ago

Why is charge usually transferred by electrons rather than by protons?

1 answer:

7 0

This is because most of the atom cannot move due to being held in place by surronding atoms, but electrons can move around and travel

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. An iron cube (ρ = 7860 kg/m3) having sides of 1 cm is submerged in open fresh water (ρ = 1000kg/m3) with its top surface at a

Korolek [52]

Answer:

$\Delta P = 98.07\,Pa$

Explanation:

The difference between top and bottom surfaces is computed by the following hydrostatic equivalence:

$\Delta P = \rho_{w}\cdot g \cdot \Delta h$

$\Delta P = \left(1000\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (0.01\,m)$

$\Delta P = 98.07\,Pa$

5 0

3 years ago

A hot–air balloon is moving at a speed of 10 meters/second in the +x–direction. The balloonist throws a brass ball in the +x–dir

IrinaVladis [17]

The ball has an initial speed of 10m/s. This is because it is moving with the balloon. Now the balloonist throws the ball 4m/s with respect to himself, so it means that he gives the ball a extra push of 4m/s, so the total speed is 14m/s. Since it takes 30 seconds to reach the ground, the distance travelled is 14*30=420m.

7 0

3 years ago

Plzz help,i will mark you as brainlist

Fantom [35]

Answer:

could you please send the whole question so I could understand

4 0

3 years ago

A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m high

aleksandrvk [35]

Answer:

boat is approaching the dock at rate 1.007 m/s

Explanation:

Given data

dock that = 1 m

rate = 1 m/s

to find out

how fast is the boat approaching

solution

we apply here pythagoras theorem here

we know pulley is 1 m height

so horizontal distance is consider x and vertical is here 1 m

and hypotenuse is y

so here we can say

x² +1² = y² ..............1

if we differentiate w.r.t time

2x dx/dt = 2y dy/dy

x dx/dt = y dy/dt

we have given x = 8m and dy/dt is 1

so from equation 1

x² +1² = y²

y² = 8² +1²

y = $\sqrt{64 +1}$

so now

x dx/dt = y dy/dt

8 dx/dt = $\sqrt{64 +1}$ (1)

dx/dt = $\sqrt{64 +1}$ (1) /8

dx/dt = 1.007 m/s

therefore we say boat is approaching the dock at rate 1.007 m/s

3 0

3 years ago

The resistivity of blood is related to its hematocrit, the volume fraction of red blood cells in the blood. A commonly used equa

Reika [66]

Answer:

0.47361

Explanation:

L = Length of cylinder = 1 cm

d = Diameter of cylinder = 0.9 cm

r = Radius of cylinder = $\frac{d}{2}=\frac{0.9}{2}=0.45\ cm$

h = Hematocrit

A = Area = $\pi r^2$

The resistivity of blood is given by

$\rho=\frac{1.32}{1-h}-0.79$

The resistivity of a material is given by

$R=\rho\frac{L}{A}\\\Rightarrow R=\frac{1.32}{1-h}-0.79\times \frac{0.01}{\pi 0.0045^2}\\\Rightarrow h=1-\frac{1.32}{\frac{AR}{L}+0.79}\\\Rightarrow h=1-\frac{1.32}{\frac{\pi 0.0045^2\times 270}{0.01}+0.79}\\\Rightarrow h=0.47361$

The hematocirt of the blood is 0.47361

8 0

4 years ago