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laila [671]
2 years ago
15

Which of the following statements is true of electromagnetic waves but NOT mechanical waves.

Physics
1 answer:
Neko [114]2 years ago
4 0

Answer:

a

Explanation:

what the heck is a medium

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A 2.0 µF capacitor is charged through a 50,000 ohm resistor. How long does it take for the capacitor to reach 90% of full charge
Nesterboy [21]

Answer:

0.23 s

Explanation:

First of all, let's find the time constant of the circuit:

\tau=RC

where

R=50,000 \Omega is the resistance

C=2.0\mu F=2.0\cdot 10^{-6}F is the capacitance

Substituting,

\tau=(50,000 \Omega)(2.0\cdot 10^{-6}F)=0.1 s

The charge on a charging capacitor is given by

Q(t)=Q_0 (1-e^{-t/\tau} ) (1)

where

Q_0 is the full charge

we want to find the time t at which the capacitor reaches 90% of the full charge, so the time t at which

Q(t)=0.90 Q_0

Substituting this into eq.(1) we find

0.90 Q_0 = Q_0 (1-e^{-t/\tau})\\0.90=1-e^{-t/\tau}\\e^{-t/\tau}=1-0.90=0.10\\-\frac{t}{\tau}=ln(0.10)\\t=-\tau ln(0.10)=(0.1 s)ln(0.10)=0.23 s

4 0
3 years ago
Change of state that occurs when hailstones form
NikAS [45]
Hailstones form when raindrops freezes that is from liquid state to solid state.
Hope you got your answer!
5 0
3 years ago
2. A 1750 kg car accelerates at a rate of 4.0 m/s2. How much force is the cars engine producing?
8090 [49]

Answer:

<h2>7000 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 1750 × 4

We have the final answer as

<h3>7000 N</h3>

Hope this helps you

6 0
3 years ago
What type of bond connects the atoms in a molecule of Carbon dioxide gas (CO2)?
Troyanec [42]

Answer:

Covalent Bond

Explanation:

Covalent Bonds happen when elements in a compound share electrons to exist together in a stable state as in the diagram

7 0
3 years ago
The length (L) of a simple pendulum is directly proportional to the square of the time period (T). Which type of graph can best
iris [78.8K]
L=T^2 so that would be a parabola
8 0
4 years ago
Read 2 more answers
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