Aray of ligth which passes the optical centre of the lens will be​

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

a sonic boom is a loud boom that breaks the sound barrier

explanation:

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft