A company wants to install a sensor to monitor the light level in the offices of their buildings. The sensor contains an LDR which has a resistance of 10kohlms in daylight and 100kohlms in the dark . The choice of resistor in the circuit is between one of 25kohlms and 1 megaohlm. The input p. d to the sensing circuit of 12 v . State and explain which resistor is the best choice for the circuit in light and dark which each of the resistors . You could put your calculations in a table .

is a Polish education technology company based in Kraków, Poland, with headquarters in New York City. It provides a peer-to-peer learning platform for students, parents, and teachers to ask and answer homework questions. The platform has elements of gamification in the form of motivational points and ranks. It encourages users to engage in the online community by answering other users’ questions. As of November 2020, reported having 350 million monthly users, making it the world's most popular education app.[5]Initially called Zadane.pl, the company was founded in 2009 in Poland by Michał Borkowski (current chief executive officer), Tomasz Kraus and Łukasz Haluch. The first million unique users monthly was achieved within 6 months after the release.[6]

In January 2011, the company founded the first international project dedicated to Russian language speakers.[7] Several other versions in multiple languages for the following markets included Turkey Latin America and Spain and Brazil

In December 2013, seven new language versions of were released, including English Indonesian Indian Filipino Romanian (.ro) and Italian (.it) sites. was initially funded by the co-founders, but then raised funds from Point Nine Capital.[9][10]

In October 2014, the company announced that it had raised another round of funding from

Explanation:

V=IR

I=12/(R of resistor + R of LDR)

R of LDR = 10kohm in light and = 100kohm in dark

R1 =  25kohm

R2 = 1Mohm

solve 4 current

                       light                                       dark

R1        12/(25+10)=0.343mA          12/(25+100)=0.096mA

R2       12/(1000+10)=0.012mA       12/(1000+100)=0.011mA

so R1 is better as its easier 2 tell its light or dark

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.