At midday, solar energy strikes the earth with an intensity of about 1 kW/m2 . What is the area of a solar collector that could collect 150 MJ of energy in 1 hour

A = 41.67 m²

Explanation:

The intensity is defined as power received per unit surface, as follows:

       

By definition, power is just the rate of change of energy with time, so we can write the following equation:

       

From the givens, we know the following:ΔE = 150 MJΔt = 1 hour = 3600 sec.

⇒    

Replacing (3) in (1), and solving for A, we get:A = 41.67 m² , which is the area of a solar collector that could collect 150MJ of energy in 1 hour, as needed.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction