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jeyben [28]
1 year ago
13

The magnetic lines of force always travel from north to south true or false

Physics
1 answer:
kumpel [21]1 year ago
7 0

Answer:

True

Explanation:

Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole. Therefore, the magnetic field lines of the earth run from the southern geographic hemisphere towards the northern geographic hemisphere.

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Joey is riding in an elevator which is accelerating upwards at 2.0 m/s2. The elevator weighs 300.0 kg, and Joey weighs 60.0 kg.
vodka [1.7K]

4200 N  is the tension in the cable that pulls the elevator upwards.

The correct option is A.

<h3>What does tension ?</h3>

Tension is the force that is sent through a rope, thread, or wire whenever two opposing forces pull on it. Along the whole length of the wire, the tensile stress pulls equally on all objects at the ends. Every physical object that comes into contact with that other one exerts force on it.

<h3>Briefing:</h3>

We employ the following formula to determine the cable's tension.

Formula:

T = mg+ma............ Equation 1

Where:

T is the cable's tension.

M = Mass of the elevator and the Joey

Accelerating with a

g = Gravitational acceleration

Considering the query,

Given:

m = (300+60) = 360 kg

a = 2 m/s²

g = 9.8 m/s²

Substitute these values into equation 2

T = (360×9.8)+(360×2)

T = 3528+720

T = 4248 N

T ≈ 4200 to the nearest hundred.

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7 0
1 year ago
A cheetah is known to be the fastest mammal on Earth, at least for short runs. Cheetahs have been observed running a distance of
Arlecino [84]

The cheetah needs 197.8 seconds to complete the 5.50 *100 m distance.

The distance traveled divided by the time taken is the most popular formula for calculating average speed. The average speed is determined by dividing the whole distance by the total time required to complete the distance. The other calculation, provided you have the initial and final speeds, adds them together and divides by 2.20. calculating the time needed for a cheetah to travel 5.50 102 meters.

10 km/h average speed is equal to 10 / 3.6, or 2.78 m/s.

Dist. = 5.50 102

Time =?

average speed = time / distance

time=5.50 x 100/ 2.78

Time = 197.8 s

Therefore, it takes a cheetah 197.8 seconds to travel 5.50 102 meters.

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4 0
10 months ago
A 34 kg bowling ball with a radius of 22 cm starts from rest at the top of an incline 4.4 m in height. Find the translational sp
liberstina [14]

Answer:

7.85 m/s.

Explanation:

Given,

Mass of the bowling ball, m = 34 Kg

radius, r = 0.22 cm

height of the inclination, h = 4.4 m

transnational velocity = ?

Moment of inertia of bowling ball,

I = \dfrac{2}{5}mr^2

Using conservation of energy

mgh = \dfrac{1}{2}I\omega^2 + \dfrac{1}{2}mv^2

We know that v = r\omega

mgh = \dfrac{1}{2}( \dfrac{2}{5}mr^2)(\dfrac{v}{r})^2 + \dfrac{1}{2}mv^2

m gh = 0.7 m v^2

v =\sqrt{\dfrac{gh}{0.7}}

v =\sqrt{\dfrac{9.81\times 4.4}{0.7}}

v = 7.85\ m/s

Speed of the bowling ball is equal to 7.85 m/s.

3 0
3 years ago
What makes magnetic objects different from non- magnetic objects?
Reil [10]
Magnets are different because the molecules in magnets are arranged so that their electrons spin in the same direction.
4 0
3 years ago
Qualitative data from surveys and interviews can be obtained by
ivann1987 [24]

Answer:

averaging the number of responses to each sample equation

6 0
3 years ago
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