The energy flow per unit time per unit area (s) of an electromagnetic wave has an average value of 695 mw/m^2. the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. the total energy that traverses the area in a time interval of one minute is closest to:

The total energy is 125.1 J.

Explanation:

Given that,

Intensity

Area

The light intensity of a electromagnetic wave

....(I)

We know that,

....(II)

We need to calculate the total energy that traverses the area

From equation (I) and (II)

Where, A = area

t = time

S = intensity

Put the value into the formula

Hence, The total energy is 125.1 J.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.