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Ahat [919]
3 years ago
9

John, a fireman, slides down a pole when the fire alarm sounds. He reaches the ground at 5m^-1. Give that his mass is 60kg. Find

the friction that acts against his motion as he slides down the pole.
Physics
1 answer:
astraxan [27]3 years ago
4 0
Friction as it is acting upon an object over a surface
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The mass of a proton is 1833 times larger than the mass of an electron. When a proton an electron interact with each other the o
Ad libitum [116K]

B. Exactly the same as the electric force of the electron on the proton.

<u>Explanation:</u>

Even if the mass of proton is increased or decreased, the force between electron and proton will remain the same because force is dependent on the charge of the object and distance between them. The force between the charges is independent of their masses. So, even if the mass of a proton is 1833 times larger than the mass of an electron, the force between them will be same.

According to Coulomb's law:

F = k\frac{q_1q_2}{r^2}

where,

F is the force

q₁ and q₂ are the charges

r is the distance between the charges

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3 years ago
what is the definition of sonic booms? HELP ASAP 50 POINTS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! and breainliest
Morgarella [4.7K]

Answer:

a loud explosive noise caused by the shock wave from an aircraft traveling faster than the speed of sound.

Explanation:

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3 years ago
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Abox has a mass of 14.4 kg. The length is 4 m longthe width is 1 m and the height is 5 m. What is the density of the box?
valkas [14]

Answer:

0.72 kg per cubic m

Explanation:

Mass = 14.4 kg

Volume = lbh = 4*1*5 = 20 cubic m

\because \: density \\  \\  =  \frac{mass}{volume}  \\  \\  =  \frac{14.4}{20}  \\  \\  = 0.72 \: kg {m}^{ - 3}

3 0
3 years ago
Help and explain please
babunello [35]

Answer: a) Moment = 200N.m

              b) F = 500N

Explanation: <u>Moment</u> or <u>Torque</u> is the tendency of a body to rotate because of an aplplied force. It can be calculated as

\tau = F.r.sin\theta

F is force applied

r is distance from the force to the point of rotation

θ is the angle formed between force and distance

a) Since F and r are perpendicular, θ=90°, sin90° = 1, so

\tau=F.r

\tau=100(2)

\tau= 200

<u>Torque</u><u> caused by weight of the barrier at the pivot is </u><u>200N.m</u>

<u />

b) Counterweight has the same torque as pivot: \tau= 200

So, to find Force necessary to balance the weight:

\tau=F.r

F=\frac{\tau}{r}

F=\frac{200}{0.4}

F = 500

<u>It is necessary </u><u>a force of 500N</u><u> from the counterweight to balance the weight.</u>

<u />

4 0
3 years ago
Conduction is the transfer of heat in:<br> 1 gases<br> 2 liquids<br> 3 solids
kykrilka [37]

Answer:

Conduction heat transfer is the transfer of <em>heat by means of molecular excitement within a material without bulk motion</em> of the matter. 

Explanation:

Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during heir random motion.

4 0
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