PHYSICS HIGH SCHOOL

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.3 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.3 cm and is 0.20 mm thick.Part AWhat is the resistivity of the leaf tissue?Express your answer to two significant figures and include the appropriate units.ρ=________Part BIs this greater than or less than the resistivity of muscle tissue in the human body?(A) greater or(B) less

Answers

Answer 1

Answer:

Answer:

Part a)

$\rho = 52.9 ohm- m$

Part b)

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Explanation:

Part a)

As we know the formula of resistance is given as

$R = \rho (L)/(A)$

here we know that

$\rho = (RA)/(L)$

here we have

$R = 2.3 M ohm$

$L = 20 cm$

$Area = (0.023)(0.20 * 10^(-3))$

$Area = 4.6 * 10^(-6) m^2$

now we have

$\rho = ((2.3 * 10^6)(4.6 * 10^(-6)))/(0.20)$

$\rho = 52.9 ohm- m$

Part b)

Resistivity of mucle tissue of human is is ranging from 15 ohm-m to 50 ohm m so here we can say that

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

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PLEASEEE HELP, thank you :)

Answers

Answer:

The answer is B.

Explanation:

Given that the current (Ampere) in a series circuit is same so we can ignore it. We can assume that the total voltage is 60V and all the 3 resistance are different, 20Ω, 40Ω and 60Ω. So first, we have to find the total resistance by adding :

Total resistance = 20Ω + 40Ω + 60Ω

=120Ω

Next, we have to find out that 1Ω is equal to how many voltage by dividing :

120Ω = 60V

1Ω = 60V ÷ 120

1Ω=0.5V

Lastly, we have to calculate the voltage at R1 so we have to multiply by 20 (R1) :

1Ω = 0.5V

20Ω = 0.5V × 20

20Ω = 10V

Average velocity is different than average speed because calculating average velocity involves what?

Answers

Two things that aren't involved in speed: -- the straight-line distance between the start- and end- points. -- the direction from start-point to end-point.

The correct answer to the question is: Direction

EXPLANATION:

The average velocity of a body is defined as the rate of change of displacement.

We know that displacement is a vector quantity. Hence, it has magnitude as well as direction for its specification.

On the other hand, the average speed of a body is defined as the rate of change of distance travelled. Hence, the average speed of a body is a scalar quantity. It means that it has only magnitude.

Hence, during the calculation of average velocity,we have to think of its direction.

Which of these statements would suggest that digital television transmission is a better method than analog?

Answers

Answer: A digatil is newer better

Explanation:

Can someone tell me some variables that could affect how far a ski jumper could travel in the air and explain the science behind it ? Thanks you will help me a lot if you can answer it !

Answers

Some things you could take into consideration are the weight of the jumpers. There height, well more like overall mass. Gravity would be another key factor. The angle at which she jumped could be another variable. Wind resistance could be another important thing. How far she is attempting to jump is an important variable.

Those are just some of the basic things.

Hope I helped. :)

Performance in ski jumping is determined not only by the motor abilities of the athlete, but alsoto a large extent by the aerodynamic features of the equipment used and by a low body weight. Manyski jumpers were extremely underweight to the point of having a body mass index (BMI =m/h2of16.4 kgm−2(heighth= 1.73m, body massm= 49 kg)

Consider two walls, A and B, with the same surface areas and the same temperature drops across their thicknesses. The ratio of their thermal conductivities is kA/kB=4 and the ratio of the wall thickness is LA/LB=2. The ratio of heat transfer rates through the walls qA/qB is:(a) 0.5

(b) 1

(c) 2

(d) 4

(e) 8

(f) None of them

Answers

Answer:

Explanation:

Heat transfer across the walls due to conduction is given by:

$q = -KA(\Delta T)/(L)$

where,

q = heat transfer rate

K = thermal conductivity

A = Area

ΔT = change in temperature

L = thickness

For wall A:

$q_A = -K_AA(\Delta T)/(L_A)$

For wall B:

$q_B = -K_BA(\Delta T)/(L_B)$

Because the change of temperature and area of walls are the same. Dividing both terms:

$(q_A)/(q_B) = ((K_A)/(L_A) )/((K_B)/(L_B))\n\n (q_A)/(q_B) =((K_A)/(K_B) )/((L_A)/(L_B))$

using values given in the question:

$(q_A)/(q_B) = (4)/(2)\n\n(q_A)/(q_B) = 2$

Therefore, the correct answer is:

(c) 2

um carro com uma velocidade de 80 km\h passa pelo km 240 de uma rodovia as 7:30. a que horas este carro chegara a proxima cidade, sabendo-se que a mesma esta situada no km 300 dessa rodovia?

Answers

From km 240 to km 300 there are 60 km.

The time to travel 60 km at 80km/h is t = d/V = 60km / 80 km/h = 3/4 h.

That is 45 minutes. Then the car will arrive at 7:30 + 45 min = 8:15.

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