Answer:
(a). The density of the wood is 
(b). The absolute pressure at the bottom of the tank is
.
Explanation:
Given that,
Side of cube = 15.0 cm
Depth = 50 cm
Tension = 6.615 N
We need to calculate the volume of the wood
Using formula of volume


We need to calculate the density of the wood
Using buoyant force


Put the value into the formula

Put the value into the formula


(b). We need to calculate the absolute pressure at the bottom of the tank
Using formula of absolute pressure

Put the value into the formula


Hence, (a). The density of the wood is 
(b). The absolute pressure at the bottom of the tank is
.
We would all die and theres no way of coming out of a black hole. What's in it is unknown.
Answer:
Explanation:
area of the coil A = .08 x .08 = 64 x 10⁻⁴ m ²
flux through the coil Φ = area of coil x no of turns x magnetic field
= 64 x 10⁻⁴ x 50 x B where B is magnetic field
emf induced = dΦ / dt = ( 64 x 10⁻⁴ x 50 x B - 0 ) / .2
= 1.6 B
current induced = emf induced / resistance
12 x 10⁻³ = 1.6 B / 15
B = 112.5 x 10⁻³ T .