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OlgaM077 [116]
3 years ago
8

A meterstick is supported at each side by a spring scale. A heavy mass is then hung on the meterstick so that the spring scale o

n the left hand side reads four times the value of the spring scale on the right hand side. If the mass of the meterstick is negligible compared to the hanging mass, how far from the right hand side is the large mass hanging. (A)25 cm (B) 50 cm (C)67 cm (D)75 cm (E) 80 cm in
Physics
1 answer:
zavuch27 [327]3 years ago
6 0

Answer:

80 cm

Explanation:

Suppose the large mass is at point A which is at length 'x' meter  from right, Since it is on meter stick so the length on left will be (1-x) meter .

Since the system is in equilibrium position

clock wise torque around point A= anti clock wise torque around point A

force on left side × distance from point A on left side = force on right side × distance from point A on right side

Since left side is 4 times more reading - it means four times force of tension is acting there as compared to right side !

Let force be F

then,

4F × (1-x)=F × x

==> 4(1-x)=x

==> 4-4x=x

==> 4 =5x

==> x= 4/5=0.8 meter = 0.8 × 100 cm = 80 cm

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Norma-Jean [14]

Answer:

q = 2,95 10-6 C

Explanation:

The magnetic force on a particle is described by the equation

      F = q v x B

Where bold indicate vectors

Let's make the vector product

      vxB =\left[\begin{array}{ccc}i&j&k\\-3&4&12\\0&0&-0.13\end{array}\right]

                     

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      vx B = 1.20 106 [0.52 i ^ - 0.39j ^]

As they give us the force module, let's use Pythagoras' theorem,

     |v xB | =1.20 10⁶ √( 0.52² + 0.39²)

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     v xB = 0.78 10⁶

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    2.30 = q 0.78 10⁶

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4 0
3 years ago
A parallel-plate capacitor in air has a plate separation of 1.25 cm and a plate area of 25.0 cm2. The plates are charged to a po
Archy [21]

Answer:

(a) Since net charge remains same,after immersion Q is same

(b) I. 14.56pF ii. 3.05V

(c) ΔU = 5.204nJ

Explanation:

a)

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k=1 for air

ε is 8.85x10-12F/m

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b)

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Uair = Q2/2C = (43.188)2/2x14.16pF = 0.066nJ

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6 0
3 years ago
Type your answers to these 4 questions in the submission area.
ELEN [110]
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A pursuit spacecraft from the planet Tatooine is attempting to catch up with a Trade Federation cruiser. As measured by an obser
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