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omeli [17]
4 years ago
14

The pressure exerted by a phonograph needle on a record is surprisingly large, due to the very small width of the needle. show a

nswer Incorrect Answer If the equivalent of 0.95 g is supported by a needle, the tip of which is a circle 0.205 mm in radius, what pressure is exerted on the record, in pascals
Physics
1 answer:
Andreyy894 years ago
4 0

Answer:

Explanation:

Given that,

Mass support is

M = 0.95g= 0.95/1000 = 0.00095kg

Radius of circle R = 0.205mm

r = 0.205/1000 = 0.000205m

Then, area of the circle can be determined using

A = πr²

A = π × 0.000205²

A = 1.32 × 10^-7 m²

From pressure definitions

Pressure = Force / Area

The force is perpendicular to the area

Force = weight = mg

F = mg = 0.00095 × 9.8

F = 9.31 × 10^-3 N

Then,

Pressure = Force / Area

P = F/A

P = 9.31 × 10^-3 / 1.32 × 10^-7

P = 70,530.30 N/m²

Since 1 pascal = 1 N/m²

Then,

P = 70,530.30 Pascals

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kondaur [170]

Explanation:

Given that,

(a) Work done by the electric field is 12 J on a 0.0001 C of charge. The electric potential is defined as the work done per unit charged particles. It is given by :

V=\dfrac{W}{q}

V=\dfrac{12}{0.0001}

V=12\times 10^4\ Volt

(b) Similarly, same electric field does 24 J of work on a 0.0002-C charge. The electric potential difference is given by :

V=\dfrac{W}{q}

V=\dfrac{24}{0.0002}

V=12\times 10^4\ Volt

Therefore, this is the required solution.

7 0
3 years ago
A man jogs at a speed of 1.6 m/s. His dog
FromTheMoon [43]
I believe it is
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5 0
3 years ago
To impress his friends while riding on a carnival
s344n2d4d5 [400]

Answer:

B. decreases while his angular speed remains  unchanged.

Explanation:

His angular speed will always be the same as the wheel's angular speed, which remains constant as it's in uniform motion. As for linear speed, which is defined as the product of angular speed and distance r to the center of rotation, and his distance to center is decreasing, his linear speed must be decreasing as well.

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Which formula describes acceleration?<br><br> m/s^2<br><br><br> m/s<br><br><br> s/m<br><br><br> m2
Aleks04 [339]

Answer:

m/s^2

Explanation:

Force = mass × acceleration

kgm/s^2 = kg × acceleration

where acceleration = Force ÷ mass

= kg m/s^2 ÷ kg

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3 0
4 years ago
If a 3.5 gram ping pong ball were traveling to the right horizontally at 12 m/s, and a larger 12 g super ball were thrown direct
algol [13]

Answer:

v = 14.32 m/s

Explanation:

According to the principle of conservation of linear momentum, both the momentum and kinetic energy of the system are conserved. Since the two balls are in the same direction of motion before collision, then;

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2.22 = 0.155 v

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The velocity of the balls after collision is 14.32 m/s.

3 0
4 years ago
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