Technician A says that a MAF sensor is a high-authority sensor and is responsible for determining the fuel needs of the engine based on the measured amount of air entering the engine. Technician B says that a cold wire MAF sensor uses the electronics in the sensor itself to heat a wire 20°C below the temperature of the air entering the engine. Who is right

MAF wich stands for mass airflow sensor determines the mass of air flowing into the engine's air intake system. ... , the wire cools When air flows past the wire, decreasing its resistance, thereby more current flows through the circuit. When the MAf goes bad, it can not sense the amount of air intake into the engine.

8 0

4 years ago

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge

GarryVolchara [31]

Answer:

i = $- \frac{r \ A'}{2 \ rho}$ , i = 0.92 A

Explanation:

This exercise asks for the electromotive force, which can be calculated with Faraday's law

fem = $- \frac{d \Phi_B }{dt}$

where the magnetic flux

Ф = B. A

bold letters indicate vectors. We can write this equation

Ф = B A cos θ

In this case the magnetic field is perpendicular to the page and the normal to the loop of the loop is also parallel to the page, therefore the angle is zero and the cosine is 1

the loop is

A = π r²

we substitute in the first equation

fem = - π r² $\frac{dB}{dt}$

we substitute the values

fem = -π r² 1

fem = - π r²

to calculate the current let's use ohm's law

V = i R

R = ρ L / A'

where A 'is the area of the wire and L is the length of the loop

L = 2π r

V = i (ρ 2π r / A ')

I = $\frac{V \ A'}{2\pi \ r \ rho}$

In this case

V = fem

I = fem / R

i = $- \frac{r \ A'}{2 \ rho}$

In order to complete the calculation, you need the radius of the loop and / or the wire cutter.

if we assume that the loop has a radius of r = 1 cm = 0.01 m and an area of the wire A'= π 10⁻⁶ m² a radius of the wire 1 mm

i = - 10⁻² π 10⁻⁶ / ( 2 1.7 10-8)

i = 0.92 A

5 0

3 years ago

Which statement about these cells is correct

Nuetrik [128]

B is correct because most of the cells look the same so it's B

5 0

3 years ago

How would you find the speed of a person who walked

Alex Ar [27]

Answer:

v = 1.25 m/s

Explanation:

We have,

Distance covered by a person is 10 meters

Time taken by him to cover that distance is 8 seconds.

If we want to find the speed of a person, we must know distance covered by it and taken. In this case, we know both distance and time. His speed is given by :

$v=\dfrac{d}{t}\\\\v=\dfrac{10\ m}{8\ s}\\\\v=1.25\ m/s$

So, the speed of the person is 1.25 m/s.

4 0

3 years ago