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horsena [70]
3 years ago
13

Compasses line up with magnetic fields. A compass will line upA. Parallel to magnetic field lines, with the south pole pointing

in the direction of the field.B. Perpendicular to magnetic field lines.C. Parallel to magnetic field lines, with the north pole pointing in the direction of the field.D. Perpendicular to magnetic field lines, in a direction defined by the right-hand rule.
Physics
2 answers:
MA_775_DIABLO [31]3 years ago
5 0

Answer:

C. Parallel to magnetic field lines, with the north pole pointing in the direction of the field.

Explanation:

When a magnet is placed in magnetic field then its North pole and south pole will experience magnetic force in opposite directions.

North pole will tend to move in the direction of magnetic field while south pole has tendency to move opposite to it.

Due to this opposite direction force magnet will experience torque if it is inclined at some angle with magnetic field

Due to this torque magnet will align in the direction of magnetic field such that its north pole will point in the direction of external field while south pole is align opposite to that

Olenka [21]3 years ago
4 0

you are welcome i hope god blesses you today

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A uniform magnetic field B=5.210 T is perpendicular to the plane of the paper (into the page). The current-carrying wire of valu
ehidna [41]

Answer:5.21 N

Explanation:

Given

B=5.210 T

I=2 A

L=0.5 m

Given Wire is perpendicular to Magnetic field

\theta =90^{\circ}

F=IL\times B

F=BIL sin\theta

F=5.210\cdot 2\cdot 0.5 sin(90)

F=5.210 N

as  1 Tesla =1 N/A/m

4 0
3 years ago
A 2.8 kg grinding wheel is in the form of a solid cylinder of radius 0.1 m. a) What constant torque will bring it from rest to a
kogti [31]

Answer:

a) τ =  0.672 N m , b) θ = 150 rad , c) W = 100.8 J

Explanation:

a) for this part let's start by finding angular acceleration, when the angular velocity stops it is zero (w = 0)

       w = w₀ + α t

       α = -w₀ / t

       α = 120 / 2.5

       α = 48 rad / s²

The moment of inertia of a cylinder is

       I = ½ M R²

Let's calculate the torque

      τ = I α

      τ = ½ M R² α

      τ = ½ 2.8 0.1² 48

      τ =  0.672 N m

b) we look for the angle by kinematics

      θ = w₀ t + ½ α t2

      θ = ½ α t²

      θ = ½ 48 2.5²

      θ = 150 rad

c) work in angular movement

      W = τ θ

      W = 0.672 150

      W = 100.8 J

7 0
3 years ago
How is conduction affected by different factors​
Lapatulllka [165]

Answer:

The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length, and the properties of those materials.

Explanation:

6 0
3 years ago
Help with the one above and the three below. I WILL GIVE BRAINLIEST!
kodGreya [7K]

1. The rocket would experience a downwards force due to gravity from the moon.  Also, the rocket would experience an upwards force from the acceleration of the rocket thrusters.  Assuming you are neglecting the force of air friction, there would be 2 forces.  If you are considering air friction as well, there would be also a downwards force of kinetic air friction acting down on the rocket as it flies, making it 3 forces.  If the rocket has already taken off, then there will be no normal force.  However, if the rocket is still on the surface of the moon, the rocket would experience a normal force from the moon.  Since the question isn't specific I can't provide a concrete answer, but it would range from 2-4 forces depending on the above factors.


2.  Since we are not sure if the person in the question is actively lifting the crate, we have to determine the downwards force of the crate due to gravity and compare it to the normal force.  

F = ma

F = (15.3)(-9.8)

F = -150N

Since the downwards force of the crate is equivalent to the normal force, it means the person is applying no force in picking up the object.  So to pick up a 150N object from scratch, you would have to exert more force than the weight of the object, so the answer is 294N.


3.  Same idea as question 2.  First determine the weight of the object:

F = ma

F = (30)(-9.8)

F = -294N

The crate in question is not moving, so the magnitudes of the forces in the upwards and downwards direction has to equal to 0.

-294 + 150N + x = 0

x = 144N

So the person is exerting 144 N.  (Which I hope is a choice that you forgot to type out on the question)


5. Image 3 has the least amount of tension since both tension forces exerted on the cables are shared amongst the two cables and they are parallel to the downwards force of gravity that acts on the object and against them.




8 0
3 years ago
What unit of measurement would be used to measure the weight of a book
Mila [183]

Answer: kilogram

Explanation:

7 0
3 years ago
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