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hjlf
3 years ago
9

What theory explains why the Earth is a magnet

Physics
1 answer:
LuckyWell [14K]3 years ago
8 0
Hi,Conclusiontime

The Dynamo theory explains why the earth is a magnet.
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To practice Problem-Solving Strategy 11.1 Equilibrium of a Rigid Body. A horizontal uniform bar of mass 2.7 kg and length 3.0 m
Zanzabum

Answer:

T_{1} = 14.88 N

Explanation:

Let's begin by listing out the given variables:

M = 2.7 kg, L = 3 m, m = 1.35 kg, d = 0.6 m,

g = 9.8 m/s²

At equilibrium, the sum of all external torque acting on an object equals zero

τ(net) = 0

Taking moment about T_{1} we have:

(M + m) g * 0.5L - T_{2}(L - d) = 0

⇒ T_{2} = [(M + m) g * 0.5L] ÷ (L - d)

T_{2} = [(2.7 + 1.35) * 9.8 * 0.5(3)] ÷ (3 - 0.6)

T_{2}= 59.535 ÷ 2.4

T_{2} = 24.80625 N ≈ 24.81 N

Weight of bar(W) = M * g = 2.7 * 9.8 = 26.46 N

Weight of monkey(w) = m * g = 1.35 * 9.8 = 13.23 N

Using sum of equilibrium in the vertical direction, we have:

T_{1} + T_{2} = W + w   ------- Eqn 1

Substituting T2, W & w into the Eqn 1

T_{1} + 24.81 = 26.46 + 13.23

T_{1} = <u>14.88</u> N

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A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.
AleksandrR [38]

(B) The balloon will rise because the upward buoyant force is greater than its weight.

Explanation:

In order to evaluate what happens to the balloon, we need to compare the magnitude of the two forces acting on the balloon:

- Its weight, W, acting downward

- The buoyant force, B, acting upward

The weight of the balloon is given by:

W=mg

where

m = 2.0 kg is the mass of the balloon

g=9.8 m/s^2 is the acceleration of gravity

Substituting,

W=(2.0)(9.8)=19.6 N

The buoyant force on the balloon is given by:

B=\rho V g

where

\rho = 1.3 kg/m^3 is the air density

V=5.0 m^3 is the balloon's volume

g=9.8 m/s^2 is the acceleration of gravity

Substituting,

B=(1.3)(5.0)(9.8)=63.7 N

We observe that the buoyant force B is larger than the weight, so the balloon will accelerate upward, and the correct answer is

(B) The balloon will rise because the upward buoyant force is greater than its weight.

#LearnwithBrainly

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