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Ierofanga [76]
3 years ago
10

How fast would a meter stick be moving if the observer measures a length of 60 cm.

Physics
1 answer:
aliya0001 [1]3 years ago
4 0
Required formula is
L= L_{0} \sqrt{1- \frac{ v^{2} }{ c^{2} } }
where L= length of a stick when it is moving with velocity v
L0=length of that stick when it is at rest
c= velocity of light
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An aluminum wire having a cross-sectional area equal to 3.90 10-6 m2 carries a current of 6.00 A. The density of aluminum is 2.7
stich3 [128]

Answer:

Vd = 1.597 ×10⁻⁴ m/s

Explanation:

Given: A = 3.90×10⁻⁶ m², I = 6.00 A, ρ = 2.70 g/cm³

To find:

Drift Velocity Vd=?

Solution:

the formula is Vd = I/nqA         (n is the number of charge per unit volume)

n = No. of electron in a mole ( Avogadro's No.) / Volume

Volume = Molar mass / density   ( molar mass of Al =27 g)

V = 27 g / 2.70 g/cm³ = 10 cm³ = 1 × 10 ⁻⁵ m³

n= (6.02 × 10 ²³) / (1 × 10 ⁻⁵ m³)

n= 6.02 × 10 ²⁸

Now

Vd = (6A) / (  6.02 × 10 ²⁸ ×  1.6 × 10⁻¹⁹ C ×  3.9×10⁻⁶ m²)

Vd = 1.597 ×10⁻⁴ m/s

6 0
3 years ago
A rotating merry-go-round makes one complete revolution in 4.0s a) what is the linear speed of a child seated 1.2 meters from th
lianna [129]

Answer:a) The linear speed of the rotating merry-go-round is 1.884 m/s.

b) The acceleration of the rotating merry-go-round  device is 2.95m/s^2.

Explanation:

a) linear speed of the device:

Distance =2\pi (r)

Child seated 1.2 meters from the center, which means that radius ,r = 1.2 meters

Time taken to complete one revolution = 4.0 seconds

\text{Linear speed}=v=\frac{distance}{time}=\frac{2\pi r}{t}=\frac{2\times 3.14\times 1.2 m}{4.0 s}=\frac{7.536 m}{4.0 s}=1.884 m/s

The linear speed of the rotating merry-go-round is 1.884 m/s.

b) Acceleration

Linear velocity ,v = 1.884 m/s

a_c=\frac{v^2}{r}

=\frac{1.884 m/s\times 1.884m/s}{1.2 m}=2.95m/s^2

The acceleration of the rotating merry-go-round  device is 2.95m/s^2.

7 0
4 years ago
Which has greater force fly hitting windshield of rapidly moving car or the force of windshield hitting fly? Explain
Goshia [24]
The force applied on the fly and the windshield are equal based on Newton's Law of Action and Reaction. the difference between them is that the fly's body does not have enough mechanical strength to withstand the force but the windshield does.
3 0
4 years ago
Mercantilism was based on a nation's power and wealth, which was enabled by _____. the size of its army the ability to import mo
olga nikolaevna [1]

Answer: the amount of precious metals that could be had.

<span>Mercantilism believed that a nation was rich based on how big their reserves were for precious metals like gold and silver. Exporting lots of gold and silver, during the time mercantilism was in place as an economic system, exhibited a nation’s wealth. </span>

6 0
3 years ago
Read 2 more answers
A 2.0 kg book is lying on a 0.75-m-high table. You pick it up and place it on a bookshelf 2.3 m above the floor. During this pro
statuscvo [17]

Answer:

The gravitational potential energy gained by the book is 30.4 J

Explanation:

The change in gravitational potential energy of an object is given by

\Delta U = mg \Delta h

where

m is the mass of the object

g is the acceleration of gravity

\Delta h is the change in height of the object

For the book in this problem,

m = 2.0 kg

g = 9.8 m/s^2

\Delta h = 2.3 m - 0.75 m =1.55 m

Substituting into the equation, we find

\Delta U = (2.0)(9.8)(1.55)=30.4 J

4 0
4 years ago
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