a 4.0x 10^3 watt motor applies a force of 8.0 x 10^2 newtons to move a boat at constant speed. ow far does the boat move in 16 seconds

80 m

Explanation:

From the question,

Power(P) = Force(F) × Velocity (V)

P = FV Equation 1

V = P/F Equation 2

Given: P = 4.0×10³ W, F = 8.0×10² N.

Substitute into equation 2

V = 4.0×10³/(8.0×10²)

V = 5 m/s.

Applying,

S = Vt Equation 3

Where S = distance move by the boat, t = time.

Given: t = 16 s, V = 5 m/s

Substitute into equation 3

s = 16(5)

s = 80 m.

Hence the distance moved by the boat is 80 m

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.