In which direction does a buoyant force act on an object?

Physics

1 answer:

Oliga [24]3 years ago

3 0

Answer: I THINK the answer is A - Up.

Explanation: The buoyancy force always points upwards because of the pressure of a fluid increases. If the buoyant force is less than the object's weight, the object will sink. You can calculate the buoyant force on an object by adding up the forces exerted on all of an object's sides.

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Near the earth's surface, the electric field in the open air has magnitude 150 N/c and is directed down towards the ground. If t

kati45 [8]

Hi there!

Using the equation for the electric field produced by an infinite sheet of charge:

$E = \frac{\sigma}{2\epsilon_0}$

E = Electric field strength (150 N/C)

σ = Surface charge density (? C/m²)

ε₀ = Permittivity of free space (8.8542× 10⁻¹² C²/Nm²)

We can rearrange the equation to solve for the surface charge density (charge per unit area)

$E = \frac{\sigma}{2\epsilon_0}\\\\\sigma = 2E\epsilon_0\\\\\sigma = 2(150)(8.8542*10^{-12}) = \boxed{2.656 \times 10^{-9} \frac{C}{m^2}}$

3 0

2 years ago

A movie stunt performer is filming a scene where he swings across a river on a vine. The safety crew must use a vine with enough

Julli [10]

Answer:

1125.66956 N

Explanation:

m = Mass of stunt performer

g = Acceleration due to gravity = 9.81 m/s²

v = Velocity of the swing = 7 m/s

T = Tension

r = Radius of the swing = Length of vine = 11.5 m

From the free body diagram

$T-mg-m\frac{v^2}{r}=0\\\Rightarrow T=mg+m\frac{v^2}{r}\\\Rightarrow T=m(g+\frac{v^2}{r})\\\Rightarrow T=80(9.81+\frac{7^2}{11.5})\\\Rightarrow T=1125.66956\ N$