Which of the following best decribes

The light energy that falls on a square meter of ground over the course of a typical sunny day is about 20 MJ. The average rate

Free_Kalibri [48]

Answer:

86MJ

Explanation:

THE TOPIC FROM WHICH THE QUESTION IS OBTAINED IS WORK, ENERGY AND POWER

Power is defined as the time rate of doing work.
Power = $\frac{Energy used/ work done}{time}$
If the energy use is in joules and the time is in seconds, then power is a measure of watts. 1watt = 1 joule per second.
According to the question, we need to find how much energy does one house use during each 24 hour day ( Already given time = 24hours) when the average rate of electric energy consumption in one house is 1.0 kW ( we have been given power = 1kW).
Power = 1kW = 1 × 10³W
Time = 24hours = 24 ×3600 = 86400seconds.
It is important we have our time in seconds so as to be consistent with unit and dimension

Power = $\frac{Energy used/ work done}{time}$

1 × 10³W = $\frac{Energy used}{86400}$

Energy used =1 × 10³W × 86400
Energy used = 86400000J = 86.4 × $10^{6}$ W = 86.4MJ

The question requested the answer in 2 significant figures and the answer is 86MJ

7 0

3 years ago

Which of the following is an instantaneous speed?

Brilliant_brown [7]

Answer:

A: All of the above

Explanation:

The instantaneous speed of an object is simply the current seed of the object at any given time. The SI unit is m/S and it is a vector quantity.

Therefore, according to the given options, they all have SI units that are consistent with distance and time which makes them all an example of instantaneous speed.

5 0

3 years ago

Which of these is a concave lens?

Stella [2.4K]

Answer:

I think its last one picture

6 0

3 years ago

Read 2 more answers

Jenny wants to determine if a new brand name washing detergent is better than her old detergent she washed ten dirty t-shirts wi

katovenus [111]

Answer:

Independent variable: washer detergent

Dependent varaible: cleaing power of effectivenes of the detergent.

Explanation:

When an experiiment is performed there exists one independent variable, one dependent variable, and some other variables that must be controlled.

The goal of the experiment is to test a hypothesis, which is a statement that relates an effect with a cause and that must be proved true or false.

The effect in the dependent variable, and the cause is the independent variable.

Jenny (the scientist) wants to show how an effect or phenomenun, the dependent variable, is explained by the explanatory, independent, variable.

In the stated experiment, Jenny wants to know how the effectiveness of a new brand detergent and an old one compare with each other. Therefore, she designs a test in which she will determine how the brand of detergent may explain (explanatory or independent variable) the cleaning power or effectiveness, the dependent variable.

Jenny only can manipulate the independent variable and observe the effect on the dependent variable.

To be conclusive, other variables must be controlled, like the fabric and the amount of dirt of the t-shirts.

4 0

4 years ago

A body moves in a straight line. At time, it's acceleration is given by a = 12t + 1. When t =0, the velocity of the body v is 2

madreJ [45]

Answer:

v = 6t² + t + 2, s = 2t³ + ½ t² + 2t

59 m/s, 64.5 m

Explanation:

a = 12t + 1

v = ∫ a dt

v = 6t² + t + C

At t = 0, v = 2.

2 = 6(0)² + (0) + C

2 = C

Therefore, v = 6t² + t + 2.

s = ∫ v dt

s = 2t³ + ½ t² + 2t + C

At t = 0, s = 0.

0 = 2(0)³ + ½ (0)² + 2(0) + C

0 = C

Therefore, s = 2t³ + ½ t² + 2t.

At t = 3:

v = 6(3)² + (3) + 2 = 59

s = 2(3)³ + ½ (3)² + 2(3) = 64.5

5 0

3 years ago

Which of the following best decribes ​

Which of the following best decribes