3 years ago

Matter that emits no light at any wavelength is called

Physics

1 answer:

lorasvet [3.4K]3 years ago

4 0

Matter that emits no light at any wavelength is called DARK MATTER.

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Calculate the phase angle (in radians) for a circuit with a maximum voltage of 12 V and w-50 Hz. The voltage source is connected

Vinvika [58]

Answer:

The phase angle is 0.0180 rad.

(c) is correct option.

Explanation:

Given that,

Voltage = 12 V

Angular velocity = 50 Hz

Capacitance $C= 20\times10^{-2}\ F$

Inductance $L=20\times10^{-3}\ H$

Resistance $R= 50\ Omega$

We need to calculate the impedance

Using formula of impedance

$z=\sqrt{R^2+(\omega L-\dfrac{1}{\omega C})^2}$

$z=\sqrt{50^2+(50\times20\times10^{-3}-\dfrac{1}{50\times20\times10^{-2}})^2}$

$z=50.00$

We need to calculate the phase angle

Using formula of phase angle

$\theta=\cos^{-1}(\dfrac{R}{z})$

$\theta=\cos^{-1}(\dfrac{50}{50.00})$

$\theta=0.0180\ rad$

Hence, The phase angle is 0.0180 rad.

3 0

3 years ago

1. George is traveling to Boston from Springfield. Springfield is 144

denpristay [2]

Answer:

48 kilometers per hour

Explanation:

144/3 = 48 km/h

3 0

2 years ago

What is the average speed of a plane that flies 7,200 km in 9 hours?

Mnenie [13.5K]

First of all, the formula for speed is;
Speed=distance/time
From the question, you have;
distance=7,200km
Time=9 hours
So that will be;
Speed=7200/9
When divided, you will have;
Speed=800
The unit for speed is km/hr or m/s. So that will be;
Speed=800km/hr
Hope that helped, have a nice day

6 0

3 years ago

What is 9.7e-6 as a decimal

skelet666 [1.2K]

Answer:

See below

Explanation:

9.7e-6 is 9.7 x 10^-6 move the decimal 6 to the LEFT to get

= .0000097

4 0

1 year ago

What is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling directly

KATRIN_1 [288]

Explanation:

The difference in frequency can be calculated using the formula

$\Delta f=f(\frac{2v'}{v-v'})$

f= source frequency from the ship

v'= speed of the wave reflected from the whale = 4.95 m/s

v= speed of the ship.

since, the source frequency and speed of the ship data is missing, calculation of difference in frequency not possible.

7 0

3 years ago