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4 years ago

A bar magnet is placed on a table so that the north pole faces right.

Physics

2 answers:

Irina-Kira [14]4 years ago

6 0

Answer:

so b????????

Explanation:

Katena32 [7]4 years ago

5 0

The correct answer is C. They are pointing right to left.

Explanation.

A magnet has two poles, a north pole and a south pole. When dealing with magnets, we define the concept of a magnetic field. A magnetic field represents the effect of the magnet on magnetic materials and moving charges in the space around the magnet. For every magnet, the magnetic field lines always point away from the north pole of the magnet towards the south pole. Since the north pole of this magnet faces right, the magnetic field lines point towards the left.

The correct answer is C. They are pointing right to left.

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At takeoff, the horizontal and vertical velocity of long jumper are 57.8 m/s and 5.6 m/s respectively. What is the resultant vel

Lady bird [3.3K]

Apply the Pythagorean theorem to get the resultant velocity:

V = $\sqrt{Vx^{2}+Vy^{2}}$

Given values:

Vx = 57.8m/s

Vy = 5.6m/s

Plug in and solve for V:

V = 58.1m/s

EDIT: Let's get the direction of the resultant velocity as well.

This equation will give the angle of the velocity as measured off of the ground:

θ = tan⁻¹(Vy/Vx)

Again, the given values are:

Vx = 57.8m/s

Vy = 5.6m/s

Plug in the values and solve for the angle θ:

θ = tan⁻¹(5.6/57.8)

θ = 5.5°

The resultant velocity is oriented 5.5° off the ground.

5 0

3 years ago

An ant walks 2\,\text m2m2, start text, m, end text to the right and then climbs 1 \,\text m1m1, start text, m, end text up a wa

NNADVOKAT [17]

Answer:

26.56°

Explanation:

given,

horizontal distance travel by the ant = 2 m

vertical distance travel by the ant = 1 m

angle of the ant above the initial point = ?

using trigonometric function

$tan \theta = \dfrac{h}{x}$

θ is the angle of the ant form initial position

h is the height on the wall

x is the horizontal distance covered by the ant

$tan \theta = \dfrac{1}{2}$

$\theta =tan^{-1}(0.5)$

$\theta =26.56^0$

hence, the angle made by the ant from the initial position is equal to 26.56°

3 0

3 years ago

Which term describes the relationship between wax and wane

andreyandreev [35.5K]

Those two words are antonyms ... two words with opposite meanings.
"Wax" means "grow".
"Wane" means "shrink".

3 0

4 years ago

Electrons in an x-ray tube are accelerated through 144 kV and directed toward a target to produce x-rays. Calculate the power of

Katarina [22]

Answer:

Power of the electron beam in the x-ray tube is 2304 W

Explanation:

Given;

voltage of the electron beam in the x-ray tube, V = 144 kV = 144 x 10³ V

current of the electron beam in the x-ray tube, I = 16.0 mA = 16 x 10⁻³ A

Power is given as the product of voltage and current in a circuit.

Power of the electron beam in the x-ray tube, P = V x I

Power of the electron beam in the x-ray tube, P = 144 x 10³ V x 16 x 10⁻³ A

P = 2304 W

Therefore, power of the electron beam in the x-ray tube is 2304 W

7 0

3 years ago

A 25 pF parallel-plate capacitor with an air gap between the plates is connected to a 100 V battery. A Teflon slab is then inser

fgiga [73]

Answer:

5.3 nC

Explanation:

The initial charge stored on the capacitor is given by:

$Q=CV$ (1)

where

$C=25 pF = 25\cdot 10^{-12}F$ is the capacitance of the capacitor

$V=100 V$ is the potential difference across the capacitor

Substituting numbers into the equation, we have

$Q=(25\cdot 10^{-12} F)(100 V)=25\cdot 10^{-10}C=2.5 nC$

When the Teflon slab is inserted between the plates, the capacitance of the capacitor is increased as follows:

$C'=kC$

where k=2.1 is the dielectric constant of the Teflon. Since the voltage V remains constant, this means that the new charge stored by the capacitor (1) will be

$Q'=C'V=kCV=kQ$

and so

$Q'=(2.1)(2.5 nC)=5.3 nC$

6 0

3 years ago