The ballistic pendulum is a simple device to measure projectile velocity v by observing the maximum angle θ to which the box of sand with embedded projectile swings. Calculate the angle θ if the 2‐oz projectile is fired horizontally into the suspended 50‐lb box of sand with a velocity v = 2000 ft/sec. Also find the percentage of energy lost during impact.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

this means that the temperature of both substances will be equal

3. dark matter

empty space could also be a simple vacuum