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Degger [83]
3 years ago
10

PLEASE HELP WILL GIVE BRAINLIEST !!!!!!!!!!!!!!!!!

Physics
2 answers:
crimeas [40]3 years ago
7 0
Any vector whose magnitude is less then 1
Aleks [24]3 years ago
6 0

Before coming into conclusion let us have a look on vector.

A vector is a physical quantity which has magnitude ,direction as well it is in accordance with the  parallelogram law of vector addition.The magnitude of a vector quantity is simply a numerical value. It can not be negative. The direction of a vector is dependent on the frame of reference or the observer.It can be taken positive or negative with respect to the assumed direction of another vector.

As per the first option a displacement in the north direction is negative.But it depends on the reference frame. If we consider south direction is positive ,then the displacement along north is negative.If the displacement along south is assumed to be  negative,then north is positive. It is so because the direction is a relative quantity.

Let us assume that vertical downward motion is taken negative and upward as positive. As the velocity of a falling object is vertically downward,so its velocity is taken as negative.But again it also depends on our assumed direction and frame of reference.

As per the third option any vector whose magnitude is greater than 1 is negative.It is wrong as the magnitude does not give any idea about the direction of a vector.

The third option tells that any vector whose magnitude is less than 1 is negative which is a wrong statement as vector magnitude can not be negative.

Hence the option 1 and 2 is partially correct.



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What is the formula of two vectors which are mutually perpendicular? ​
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a .(b+c) = a.b+a.c

Explanation:

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3 years ago
A pair of adult nitwits sit balanced on a teeter totter type device. One of them, whose mass is 54.2 kg, is 1.20 m from the poin
andreev551 [17]

Answer:

The mass of the second person is 28.91 kg

Explanation:

Given;

mass of the first adult, m₁ = 54.2 kg

distance of the first adult from the point of balance, x = 1.20 m

mass of the second adult, = m₂

distance of the second adult from the point of balance, y = 2.25 m

Taking moment about the point of balance, we will have

m₁x = m₂y

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y = 28.91 kg

Therefore, the mass of the second person is 28.91 kg

3 0
4 years ago
Read 2 more answers
A hot air balloon is traveling vertically upward at a constant speed of 4.5 m/s. When it is 28 m above the ground, a package is
ella [17]

Answer:

1.97 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.8 m/s²

s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0

Solving the above equation we get

t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89

So, the time the package was in the air is 1.97 seconds

3 0
3 years ago
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