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Elis [28]
1 year ago
15

Two magnets with north poles facing each other move which way?

Physics
1 answer:
hodyreva [135]1 year ago
6 0

Answer:

they repel each other

Explanation:

The same poles repel each other

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Let the displacement function of a particle is x(t)=(20t^2-15t+200). Find the total displacement, instantaneous velocity and ins
irga5000 [103]

Answer:

A.) 39.5 m

B.) 0

C.) 60m/s^2

Explanation:

Given that a displacement function of a particle is x(t)=(20t^2-15t+200).

To Find the total displacement,

Reduce everything by dividing them by 5

X(t) = 4t^2 - 3t + 40 ...... (1)

For instantaneous velocity, differentiate x(t). That is,

dy/dt = 60t - 15 ...... (2)

But dy/dt = velocity.

If dy/dt = 0, then

60t - 15 = 0

60t = 15

t = 15/60

t = 0.25s

Substitutes t in equation (1)

Total displacement will be

X(t) = 4(0.25)^2 - 3(0.25) + 40

X(t) = 0.25 - 0.75 + 40

Total displacement = 39.5 m

To calculate instantaneous velocity, substitute t into equation (2)

V = 60 (0.25) - 15

V = 0.

and to find instantaneous acceleration, differentiate dv/dt

dv/dt = 60

Therefore, acceleration = 60 m/s^2

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If the mass of an object increases by a factor 2, kinetic energy?
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Explanation:

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

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Where;

K.E represents kinetic energy measured in Joules.

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V represents velocity measured in metres per seconds square.

Given that mass, m = 2m

Substituting into the equation, we have;

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K.E = ½*2mv²

Cross-multiplying, we have;

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