Answer:
Option (B) is true
Explanation:
refractive index of water = n1
refractive index of air = na = 1
refractive index of oil = n2
When the ray goes from water to air
Use Snell's law
Let the angle of incidence is i
n1 Sin i = na x Sin r
For total internal reflection, r = 90°
n1 x Sin i = 1 x Sin 90
Sin i = 1 / n1 .... (1)
For water oil interface
angle of incidence is i and let the angle of refraction is r.
n1 x Sin i = n2 x Sin r
n1 x / 1 n1 = n2 Sin r (from equation (1)
Sinr = 1/n2
Answer:
e. All of the above are projectile
Explanation:
A projectile is an object with motion, aka a non-zero speed. A cannonball throwing straight up, rolling down a slope, rolling off the edge of a tale, thrown through the air have motion. They all have speed and kinetic energy. Therefore they can all be considered a projectile.
Specific heat
Let me know if you need further explanation!
Answer:
Es útil porque al saberlo evitas sobrexponerte a problemas como <em><u>enfermedades, desgarros o daños a largo plazo de tu cuerpo.</u></em>
Explanation:
When a person decides to start exercising or some type of physical activity, it is necessary for him to know how much his body can resist that activity during a defined period of time.
If in some way or another your body does not resist physical activity, you can hurt yourself, tear a ligament or muscle or get sick.
One of the most common diseases that almost nobody notices is the increase in circulatory and heart problems.
It is best to know your physical condition, how much weight you can carry with weights, or how long you can last doing physical activities.
Work is (force applied) x (distance through which the force moves).
Since the suitcase doesn't move up or down during the 15 minutes,
no work is done ... zero, zip, nada ... according to the real Physics
definition of 'work'.
