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3 years ago

If the slight resistance you feel from a light switch (when you flick it) is the reaction force, what is the action force?

Physics

1 answer:

ziro4ka [17]3 years ago

3 0

Answer:

The action force is the force that causes a reaction, in this case, it will be flicking the switch, the resistance of the switch of being moved is what you "fell" as the resistance force. The correct option is A

Again, an action force is a given force in one direction, in this case, the spring is not stretching, but there is a force applied on it, so the action force will be the force of pulling the spring from both ends, in this case, the correct option is C

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We wrap a light, nonstretching cable around a 8.00 kg solid cylinder with diameter of 30.0 cm. The cylinder rotates with negligi

antoniya [11.8K]

Answer:

h = 16.67m

Explanation:

If the kinetic energy of the cylinder is 510J:

$Kc=510=1/2*Ic*\omega c^2$

$\omega c=\sqrt{510*2/Ic}$

Where the inertia is given by:

$Ic=1/2*m_c*R_c^2=1/2*(8)*(0.15)^2=0.0225kg.m^2$

Replacing this value:

$\omega c=106.46rad/s$

Speed of the block will therefore be:

$V_b=\omega_c*R_c=106.46*0.15=15.969m/s$

By conservation of energy:

Eo = Ef

Eo = 0

$Ef = 510+1/2*m_b*V_b^2-m_b*g*h$

So,

$0 = 510+1/2*m_b*V_b^2-m_b*g*h$

Solving for h we get:

h=16.67m

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4 years ago

When did agriculture first began?

timofeeve [1]

Answer:

Humans invented agriculture between 7,000 and 10,000 years ago, during the Neolithic era, or the New Stone Age. There were eight Neolithic crops: emmer wheat, einkorn wheat, peas, lentils, bitter vetch, hulled barley, chickpeas, and flax.

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3 years ago

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A solenoid with 435 turns has a length of 7.50 cm and a cross-sectional area of 3.50 ✕ 10−9 m2. Find the solenoid's inductance a

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Answer:

Solenoid's inductance is 1.11 × 10^-8H

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Answer:

Explanation:

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Fraction of planet with life and civilization (now) =1/5

Therefore multiplying we have:

1000×1/10×1/4×1/5 = 5

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3 years ago

Which of the following describes an action-reaction pair?

Diano4ka-milaya [45]

Answer B is the correct pair.

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