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Studentka2010 [4]

3 years ago

6

Two parallel circular plates with radius carrying equal-magnitude surface charge densities of are separated by a distance of How

much stored energy do the plates have? A. 120 B. 360 C. 12 D. 37

2 answers:

Paha777 [63]3 years ago

8 0

I’m thinking it’s a but I’m not that smart

SpyIntel [72]3 years ago

6 0

Answer:

I guess it is A. I am not sure

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A short-wave radio antenna is supported by two guy wires, 155 ft and 175 ft long. Each wire is attached to the top of the antenn

Vladimir79 [104]

Answer:

163.8 ft

Explanation:

In triangle ABD

$AB$ = 155 ft

$Cos63 = \frac{BD}{AB} = \frac{BD}{155}\\BD = 155 Cos63 \\BD = 70.4 ft$

$Sin63 = \frac{AD}{AB} = \frac{AD}{155} \\AD = 166 Sin63\\AD = 148 ft$

Using Pythagorean theorem in triangle ADC

$AC^{2} = AD^{2} + DC^{2} \\175^{2} = 148^{2} + DC^{2} \\DC = 93.4 ft$

$d$ = distance between the anchor points

distance between the anchor points is given as

$d = BD + CD = 70.4 + 93.4\\d = 163.8 ft$

5 0

3 years ago

Read 2 more answers

Astronomical observatories have been available since ancient times, and many cultures set aside special sites for astronomical o

Vlada [557]

Answer:

The answer is "telescopes".

Explanation:

Throughout ancient times, astronomical observatories have indeed been available, and so many historical locations were reserved for astronomical observations. All contemporary astronomers lacked within those older telescopes were lenses until 1610. A telescope is indeed an instrument used to view far-off objects. Telescopes often are being used to look at planets and stars.

8 0

3 years ago

Calculate the volume of this regular solid.

Nataly [62]

Answer:

V = 42.41cm^3

Explanation:

In order to calculate the volume of the solid, you use the following formula:

$V=\frac{1}{3}\pi r^2 h$

where

r: radius of the circular base of the cone = 3 cm

h: height from the circular base to the peak of the cone = 4.5 cm

You replace the values of r and h in the formula for the volume V:

$V=\frac{1}{3}\pi(3cm)^2(4.5)=42.411cm^3\approx42.41cm^3$

hence, the volume of the solid is 42.41 cm^3

5 0

3 years ago

A car drives at a velocity of 6.8 m/s for 250 seconds. How far did it travel?

Leno4ka [110]

$\qquad \qquad\huge \underline{\boxed{\sf Answer}}$

Here's the solution ~

As we know, Displacement =

$\qquad \sf \dashrightarrow \: velocity \times time$

$\qquad \sf \dashrightarrow \: 6.8 \times 250$

$\qquad \sf \dashrightarrow \: 1700 \: m$

<h3>OR </h3>

$\qquad \sf \dashrightarrow \: 1.7 \: km$

The car travelled 1700 meters ( 1.7 km )

8 0

2 years ago

When operated on a household 110.0 V line, typical hair dryers draw about 1450 W of power. The current can be modeled as a long,

dezoksy [38]

Answer:

0.075A

Explanation:

We can consider this system as a circuit, hence we can take the current from the formula for the electric power as follow

$P=IV\\I=\frac{P}{V}=\frac{110V}{1450W}=0.075A$

I hope this is useful for you

regards

4 0

3 years ago