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Degger [83]
4 years ago
5

A vector of magnitude 2 cannot be added to a vector of magnitude 3 so that the magnitude of the resultant is

Physics
1 answer:
Readme [11.4K]4 years ago
5 0
<h2>Answer:less than 1 and more than 5</h2>

Explanation:

Vectors are directed physical quantity which also have a magnitude.

When two vectors add,

there are two extreme cases.

Case 1:When both the vectors are in same direction.

In this case,the magnitude is maximum.

The magnitude is given by the sum of individual magnitudes which is 2+3=5.

The maximum possible magnitude is 5.

Case 2:When both the vectors are in opposite direction.

In this case,the magnitude is minimum.

The magnitude is given by the absolute difference of individual magnitudes which is 3-2=1.

The minimum possible magnitude is 1.

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Isaac drops a rubber ball drom height of 2.0m and it bounces to a height of 1.5m. a) What fraction of it's initial energy is los
True [87]

Answer:

a)  ΔE = 25 %

b) v = 8,85 m/s

c) The energy was used against air resistance

Explanation:

In any situation total energy of a body is equal to potential energy plus

kinetic energy, then, just at the moment when Isaac dop the ball the situation is:

Ei = Ep + Ek         where     Ep = m*g*h    and  Ek = 1/2*m*v²

As v = 0  (Isaac drops the ball)

Ei = Ep  =  m*g*h    = 2*m*g

At the end (when the ball bounced to 1,5 m

E₂ = Ep₂  + Ek₂         again at that point  v =0 and

E₂ = 1,5*m*g*

Ei =  E₂ + E(lost)

E(lost) = Ei - E₂

E(lost) = 2*m*g* - 1,5*m*g      and the fraction of energy lost is

E(lost)/Ei

ΔE = (2*m*g* - 1,5*m*g )/ 2*m*g

ΔE = 0,5*m*g / 2*m*g

ΔE = 0,5/2

ΔE = 0,25      or     ΔE = 25 %

b) The speed of the ball is

Potential energy is converted in kinetic energy just when the ball is touching the ground, then

m*g*h = 1/2*m*v²

2*h*g = 1/2 *v²

v² = 4*g*h

v² = 4*2*9,8

v² = 78,4

v = 8,85 m/s

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Two iron weights, one twice the mass of the other, are dropped from the top of a building. Compared with the lighter weight, the
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