The timing device in an automobile's intermittent wiper system is based on an RC time constant and utilizes a 0.350 µF capacitor and a variable resistor. Over what range (in MΩ) must R be made to vary to achieve time constants from 2.50 to 17.0 s?

Explanation:

Given that,

Capacitance of the capacitor is

C = 0.350 µF = 0.35 × 10^-6 F

Time constant ranges from

τ(min) = 2.5s

τ(max) = 17s

We want to find the range the resistance

Now, using the time constant formulae

τ = RC

Then, R= τ/C

So,

R(min) = τ(min) /C

R(min) = 2.5 / 0.35 × 10^-6

R(min) = 7.143 × 10^6 Ω

R(min) = 7.143 MΩ

R(max) = τ(max) /C

R(max) = 17 / 0.35 × 10^-6

R(max) = 48.57 × 10^6 Ω

R(max) = 48.57 MΩ

So the resistance ranges from

7.143 MΩ < R < 48.57 MΩ

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2