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snow_tiger [21]
3 years ago
8

Question 7

Physics
1 answer:
VLD [36.1K]3 years ago
3 0

Answer: m= 4kg

Explanation:

Use equation for force:

F=m*a

F=20 N

a=5 m/s²

m=?

1N=kg*m/s²

---------

F=m*a

m=F/a

m=(20 kg*m/s²)/5m/s²

m=4kg

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FrozenT [24]
Gravity obeys the inverse square law.  At 6400 km above the center of the Earth (Earth's surface) you weigh x.  Twice that reduces your weight to 1/4th.  Four times that height reduces your weight to 1/16th.  4 times 6400 km is 25,600 km.  But that is above the center of the earth, and the question requests the height above the surface, so we deduct 6400 km to arrive at our final answer:  19,200 km.

Incidentally, it doesn't exactly work the opposite way.  At the center of the Earth the mass would be equally distributed around you, and you would therefore be weightless.
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3 years ago
Write an equation for the magnetic field vector b generated by the current at an arbitrary point in terms of i, the length eleme
Lubov Fominskaja [6]

The magnetic field vector B generated by the current at an arbitrary point in terms of i, the length element dl, and the vector for the distance r from dl to the point is given by the equation dB =  μ0/4 π ∫ (dl x r)/rr^{3}

<h3>Biot – Savart Law and its Applications:</h3>

The Biot – Savart Law gets its name from Jean-Baptiste Biot and Felix Savart. This is a formula that describes the relationship between force, displacement, and velocity. It plays a huge role in the branch of electromagnetism. This law is used to derive the equation between the magnetic field which is produced due to the flow of a constant electric current.

The equation of Biot – Savart law is

dB = μ0/4 π ∫ {(idl sinΦ)/r2}

Here,

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dl is the small length of the wire. As the direction of this length is along the current hence it forms the vector idl.

r is the position vector of the point in question which is drawn from the current element and

Φ is the angle between the two.

<h3>Applications of Biot – Savart Law </h3>

• It helps in the calculation of magnetic field in an infinitely long straight wire with constant current,

• Calculation of magnetic field in the center of current carrying arc can be done by this,

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To know more about Biot - Savart Law visit:

brainly.com/question/14950341

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3 0
1 year ago
A 1,800-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact
Jobisdone [24]

Answer:

average force = 385,140 N

Explanation:

from the question we are given the following

mass (m) = 1800 kg

distance of fall (d) = 3 m

driven distance (l) = 14.4 cm = 0.144 m

acceleration due to gravity (g) = 9.8 m/s^{2}

work done = average force x driven distance.....equation 1

and

work done = change in kinetic energy + change in potential energy

work done = (0.5 x m x (v^{2} - u^{2})) + (m x g x (-d-l))

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we now have work done = (m x g x (-d-l))...equation 2

now equating the two equations for work done we have

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3 0
3 years ago
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Colt1911 [192]

Answer:

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3 years ago
a 2100-kg car drives with a speed of 18 m/s onb a flat road around a curve that has a radius of curvature of 83m. The coefficien
Law Incorporation [45]

Answer:

<u>The magnitude of the friction force is 8197.60 N</u>

Explanation:

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\Sigma F=ma_{c}=m\frac{v^{2}}{R}

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Now, the force acting in the motion is just the friction force, so we have:

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