Solve each of the following

Explanation:

Amplitude=1 cm

Frequency=2Hz

Periodic time=1/F=1/2=0.5sec

Wave length=4m

Velocity= λ x f=4m x 2Hz=8m/s

Hope it will help you.

the answer is the index of refraction of the second medium is higher. i just took the test.

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.