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3 years ago

Why is cathode positive in leclanche cell??

Physics

1 answer:

laila [671]3 years ago

7 0

Answer:

Because the zinc is reluctant

Explanation:

A leclanche cell contains a conducting solution (electrolyte) of ammonium chloride, a cathode (positive terminal) of carbon, a depolarizer of manganese dioxide (oxidizer), and an anode (negative terminal) of zinc (reductant).

As the Zn2+ ions move away from the anode, leaving their electrons on its surface,

Zn → Zn2+ + 2e−

the anode becomes more negatively charged than the cathode. When the cell is connected to an external electrical circuit, the excess electrons on the zinc anode flow through the circuit to the carbon rod, the movement of electrons forming an electric current.

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The pressure at the pump outlet is 2372 psi. If the pump has a mechanical efficiency of 0.93, what input horsepower is required

11Alexandr11 [23.1K]

Answer:

HP = 27.08 hp

Explanation:

The complete question has a theoretical flow rate of 18.2 GPM. So, to find the input horsepower, we will use the following formula:

HP = QP/1714(E)

where,

HP = Input Horse Power = ?

Q = Volume Flow Rate in Gallons Per Minute (GPM) = 18.2 GPM

P = Outlet Pressure in psi = 2372 psi

E = Mechanical Efficiency = 0.93

Therefore,

HP = (18.2 GPM)(2372 psi)/(1714)(0.93)

8 0

3 years ago

Under very dim levels of illumination foveas react to increase the sensitivity of the optic nerve. rods are more light-sensitive

Alex777 [14]

Answer:

rods are more light sensitive than cones.

Explanation:

There are two types of photo receptors in retina of our eyes. 1 Rods and 2 Cones. Rods are about 120 million and they are more sensitive then the cones. But the rods are not sensitive to color. Cones help us in seeing the color and there are about 6 to 7 million cones that provide color sensitivity to our eyes. That is why in the dark or where their are dim levels of illumination rods provide us scotopic vision. Because rods are more light sensitive then the cones.

7 0

4 years ago

Read 2 more answers

A Pitot-static tube is used to measure the velocity of helium in a pipe. The temperature and pressure are 44oF and 24 psia. A wa

leonid [27]

Answer:

V=203 ft/s

Explanation:

answer is available in word document named "attach 1" due to some technical error in maths equation. please find the attached document

Download docx

4 0

4 years ago

Read 2 more answers

What is the most important safety rule in science? A. Never work with chemicals. B. Always use unbreakable glassware. C. Always

sasho [114]

Well based on the three I would think it's C

4 0

3 years ago

. A 1.50kg mass on a spring has a displacement as a function of time given by the equation: x(t) = (7.40cm)cos[(4.16s-1)t – 2.42

rusak2 [61]

Answer:

Solution:

we have given the equation of motion is x(t)=8sint [where t in seconds and x in centimeter]

Position, velocity and acceleration are all based on the equation of motion.

The equation represents the position. The first derivative gives the velocity and the 2nd derivative gives the acceleration.

x(t)=8sint

x'(t)=8cost

x"(t)=-8sint

now at time t=2pi/3,

position, x(t)=8sin(2pi/3)=4*squart(3)cm.

velocity, x'(t)=8cos(2pi/3)==4cm/s

acceleration, x"(t)==8sin(2pi/3)=-4cm/s^2

so at present the direction is in y-axis.

5 0

3 years ago