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2 years ago

Given that: = 2i + 9j +3k and = -i – 4k . Find

Physics

1 answer:

Igoryamba2 years ago

7 0

Answer:

3i+9j= -7k

Explanation:

2i+I+9j=-4k-3k

3i+9j= -7k

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What is difference between magnetic flux and magnetic flux linkage?

Anika [276]

Answer:

Magnetic flux has formular: BA while Magnetic flux linkage has formula: NBA

Explanation:

N is number of turns of a coil

B is magnetic flux density across the coil

A is area of coil

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2 years ago

NEED HELP ASAP

katrin [286]

Answer:

its In most solids, conduction takes place as particles vibrate in place.

Explanation:

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2 years ago

The force that acts on an object lying on a surface, acting in a direction perpendicular to the surface is called ____________

DanielleElmas [232]

If it is on land gravitational force
If it is on water thrust

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2 years ago

On average, both arms and hands together account for 13% of a person's mass, while the head is 7.0% and the trunk and legs accou

Feliz [49]

Answer:

Angular velocity, $N_f = 242.36 rpm$

Explanation:

The mass of the skater, M = 74.0 kg

Mass of each arm, $m_{a} = 0.13 * \frac{M}{2}$ ( since it is 13% of the whole body and each arm is considered)

$m_{a} = 0.13 * 37\\m_a = 4.81 kg$

Mass of the trunk, $m_{t} = M - 2m_{a}$

$m_t = 74 - 2(4.81)\\m_{t} = 64.38 kg$

Total moment of Inertia = (Moment of inertia of the arms) + (Moment of inertia of the trunks)

$(I_{T} )_i = 2(\frac{m_{a}L^2 }{12} + m_a(0.5L + R)^2) + 0.5 m_t R^2$

$(I_{T} )_i = 2(\frac{4.81 * 0.7^2 }{12} + 4.81(0.5*0.7 + 0.175)^2) + 0.5 *64.38* 0.175^2\\(I_{T} )_i = 3.052 + 0.986\\(I_{T} )_i = 4.038 kgm^2$

The final moment of inertia of the person:

$(I_{T} )_f = \frac{1}{2} MR^{2} \\(I_{T} )_f = \frac{1}{2} * 74*0.175^{2}\\(I_{T} )_f = 1.133 kg.m^2$

According to the principle of conservation of angular momentum:

$(I_{T} )_i w_{i} = (I_{T} )_f w_{f}\\w_{i} = 68 rpm = (2\pi * 68)/60 = 7.12 rad/s\\4.038 * 7.12 =1.133* w_{f}\\w_{f} = 25.38 rad/s\\w_{f} = \frac{2\pi N_f}{60} \\25.38 = \frac{2\pi N_f}{60}\\N_f = (25.38 * 60)/2\pi \\N_f = 242.36 rpm$

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2 years ago

According to Heisenberg's uncertainty principle, the more we know about a particle's momentum, the less we know about its ______

Hoochie [10]

Answer:

location.

Explanation:

Heisenberg uncertainty principle states that it is basically impossible to know the exact position and momentum of a particle at the same time. According to my research on this principle, I can say that based on the information provided within the question the more we know of the momentum the less we know about it's location.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

7 0

3 years ago