Physics, 19.08.2019 16:20 Alex4530

Astudent places four t-shirts
outside on a sunny day.
which color shirt will reflect
the most light?
-red
-black
- green
- white

Answers: 1

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Answers

The question here is which shirt reflects most of the light.

White shirt reflects most of the light. That is why we wear white shirts during hot summer to keep ourselves cool. Also, a white shirt appears white to our eyes as all colors are reflected equally. So our eye sees the mixture.

Red shirt reflects only red light. so we sense it as red in our eyes. The other colors are absorbed.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

answer///terminator or twilight zone;

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Astudent places four t-shirts
outside on a sunny day.
which color shirt will reflect