The light bulb in your room is not very bright. You want to use a concave mirror to direct its illumination into a tight, parallel beam of light for reading. The radius of curvature of the mirror is 30 centimeters. At what distance from the mirror should you place the light bulb to produce this parallel light beam

Answers

Answer 1

Answer:

A point source is to be used with a concave mirror to produce a beam of parallel light. The source should be placed midway between the center of curvature and the mirror. To solve this question you have to draw a ray diagram. Apply the mirror equation to determine the image distance and finally make sure that the first two steps are consistent with each other.

I hope this helps, Regards.

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Compare and contrast the geocentric view of the solar system with the heliocentric view of the solar system

Answers

This is fairly easy. The earlier view of the solar system (geocentric) was all based on how other planets and the sun were constantly revolving the earth and we were completely stationary. The Heliocentric view has been proved to be accurate, and it is that the sun is stationary and the planets are revolving it. The similarities are that in that time, it was a continued belief that the planets were the Roman Gods, i.e. Jupiter, Neptune. Another thing is that they were correct in the Geocentric theory with the thought that the planets revolved around something.

An electric dryer consumes 6.0 × 10^6 joules ofelectrical energy when operating at 220 volts for
1.8 × 103 seconds. During operation, the dryer
draws a current of
(1) 10. A (3) 9.0 × 102 A
(2) 15 A (4) 3.3 × 103 A

Answers

Answer : The dryer draws a current of 15 A.

Explanation :

Given that,

Energy consumed, $E=6* 10^6\ J$

Voltage, V = 220 Volts

Time, $t=1.8* 10^3\ s$

Power dissipated is given by :

$P=(E)/(t)$

Also, P = VI

So, $VI=(E)/(t)$

$I=(E)/(Vt)$

$I=(6* 10^6\ J)/(220\ V* 1.8* 10^3\ s)$

$I=15\ A$

So, the correct option is (2)

Hence, this is the required solution.

The dryer draws a current of 15 A.Electric currents is the ratio of charge per unit of time.

What is electric current?

The pace at which electrons travel through a conductor is known as electric current. The ampere is the SI unit for electric current.

Electrons are tiny particles that reside within a substance's molecular structure.

The given data in the problem is;

V is the voltage= 220 volts

E is the electric energy= 6.0 × 10⁶

t is the time =1.8 × 10³ seconds.

I is the electric current=?

The electric current is found as;

$\rm P= (E)/(t) \n\n\ P= VI \n\n VI = (E)/(t) \n\n I= (E)/(VT) \n\n I= (6 * 101^6 )/(220 * 1.8 * 10^3) \n\n \rm I= 15 A$

Hence the dryer draws a current of 15 A.Electric currents is the ratio of charge per unit of time.

To learn more about the electric current refer to the link;

brainly.com/question/7643273

Find the acceleration of a train whose speed increases from 9 m/s to 22 m/s in 160s

Answers

acceleration = (v2-v1) / (t2-t1) = (22-9) / 160 = 13/160 m/s

What is an isobar?a. a unit of measurement for air pressure
b. a line along which air pressure is constant
c. a region in which the weather is not changing
d. a symbol on a weather map showing wind direction

Answers

Answer:

B.a line along which air pressure is constant

Explanation:

i took the quiz and got it right

PLZ EXPLAIN THE EQUATION AND I WILL GIVE BRAINLIST You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father. Which plank will give you the most mechanical advantage? Calculate the MA for each plank

Answers

Answer:

The 8 foot long plank

Explanation: hope this helps :)

Sa se calculeze caldura degajata de un fier de calcat dace este alimentat la 220v si este parcurs de un curent electric de 100 a. Se stie ca acesta functioneaza 25 de min