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jonny [76]
3 years ago
11

Explain why there are gaps between the rails and why the bolts are in oval shaped holes?

Physics
1 answer:
Kazeer [188]3 years ago
5 0
<span>Rails are made of metal, and it expands and contracts as the temperature outside changes. If rails were to exactly butt up against each other, their expansion could cause their shape to change or cause the rail to buckle. Having some play in the joint and bolt-hole allows for some �give� in this expansion/contraction. You see the same effect in sidewalks where the concrete is formed in sections with gaps in between�normal expansion of concrete could cause it to crack if there is no �give� between the pieces. </span>
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Vector ????⃗ has a magnitude of 16.6 and is at an angle of 50.5∘ counterclockwise from the +x‑axis. Vector ????⃗ has a magnitude
natka813 [3]

Answer:

For vector u, x component = 10.558 and  y component =12.808

unit vector = 0.636 i+ 0.7716 j

For vector v, x component = 23.6316 and y component = -6.464

unit vector = 0.9645 i-0.2638 j

Explanation:

Let the vector u has magnitude 16.6

u makes an angle of 50.5° from x axis

So u_x=ucos\Theta =16.6\times cos50.5=10.558

Vertical component u_y=usin\Theta =16.6\times sin50.5=12.808

So vector u will be u = 10.558 i+12.808 j

Unit vector u=\frac{10.558i+12.808j}{\sqrt{10.558^2+12.808^2}}=0.636i+0.7716j

Now in second case let vector v has a magnitude of 24.5

Making an angle with -15.3° from x axis

So horizontal component v_x=vcos\Theta =24.5\times cos(-15.3)=23.6316

Vertical component v_y=vsin\Theta =24.5\times sin(-15.3)=-6.464

So vector v will be 23.6316 i - 6.464 j

Unit vector of v =\frac{23.6316i-6.464}{\sqrt{23.6316^2+6.464^2}}=0.9645i-0.2638j

8 0
3 years ago
_______is the product of a force and the time during which the force acts
saul85 [17]

Answer:

impulse is the product of a force and the time during which the force acts

Explanation:

i hope this will help you :)

7 0
3 years ago
A fixed 11.2-cm-diameter wire coil is perpendicular to a magnetic field 0.53 T pointing up. In 0.10 s , the field is changed to
Karolina [17]

Answer:

The average induced emf in the coil is 0.0286 V

Explanation:

Given;

diameter of the wire, d = 11.2 cm = 0.112 m

initial magnetic field, B₁ = 0.53 T

final magnetic field, B₂ = 0.24 T

time of change in magnetic field, t = 0.1 s

The induced emf in the coil is calculated as;

E = A(dB)/dt

where;

A is area of the coil = πr²

r is the radius of the wire coil = 0.112m / 2 = 0.056 m

A = π(0.056)²

A = 0.00985 m²

E = -0.00985(B₂-B₁)/t

E = 0.00985(B₁-B₂)/t

E = 0.00985(0.53 - 0.24)/0.1

E = 0.00985 (0.29)/ 0.1

E = 0.0286 V

Therefore, the average induced emf in the coil is 0.0286 V

3 0
3 years ago
Why is it making me do this
Julli [10]

Answer:

I don't know.

Explanation:

I have no idea what you are referring to.

4 0
2 years ago
How high would a 75 kg hiker have to climb to increase her potention by 12000 J
LekaFEV [45]

16.33m

Explanation:

Given parameters:

Mass of the hiker = 75kg

Potential energy = 12000J

Unknown:

Height = ?

Solution:

The potential energy is the energy at rest of a body.

   Potential energy =  mgh

m is the mass of the hiker

g is the acceleration due to gravity

h is the height

  The unknown is the height;

          Height = \frac{Potential energy}{mg}

           Height = \frac{12000}{75 x 9.8} = 16.33m

Learn more:

Potential energy brainly.com/question/10770261

#learnwithBrainly

5 0
3 years ago
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