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2 years ago

Which statement best describes the importance of joints in the roadways of Bridges ?

Physics

1 answer:

Sergeeva-Olga [200]2 years ago

3 0

Answer:

c. Joints allow the roadway to expand and contract as cars put force on the bridge

Explanation:

The reasons why joints are allowed on roadway is to accommodate the contraction and expansion of the road as cars put force on them.

Most materials used in making roadways are susceptible to expansion and contraction.
When a measure of force is applied their length either increases or decreases depending on the type of force.
To accommodate these changes, joints are placed in roadways

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You have a rock sample and analyze it for the presence of radioactive isotopes in order to determine when it was formed. You fin

Firdavs [7]

Answer:

the decay of half of the nuclei only a half-life has passed , b) in rock time it is 1 108 years

Explanation:

The radioactive decay is given by

N = N₀ $e^{\lambda t}$

If half of the atoms have decayed

½ N₀ = N₀ $e^{\lambda t}$

½ = $e^{\lambda t}$ ₀

Ln 0.5 = - λ t

t = - ln 0.5 /λ

The definition of average life time is

$T_{1/2}$ = ln 2 / λ

λ = ln 2 / $T_{1/2}$

λ = 0.693 / 100 10⁶

λ = 0.693 10⁻⁸ years

We replace

t = -ln 0.5 / 0.693 10⁻⁸

t = 10⁸ years

We see that for the decay of half of the nuclei only a half-life has passed

b) in rock time it is 1 108 years

8 0

2 years ago

Gamma ray technology can be used to do which of the following?

Rudiy27

Answer:

Explanation:

radiation can treat tumors.

5 0

2 years ago

The latent heat of vaporization of a substance is the amount of energy associated with doing which of the following to 1 kg of t

mr Goodwill [35]

Converting it from liquid to gas

6 0

2 years ago

Read 2 more answers

A parallel plate air capacitor has a capacitance of 10 to the power -9. What potential difference is required for a charge of 5×

Maurinko [17]

The potential difference across the capacitor is 5 × 10∧4 volts and the energy stored in it is 1. 25 Joules

<h3>What is the energy in a capacitor?</h3>

The energy stored in a capacitor is an electrostatic potential energy.

It is related to the charge(Q) and voltage (V) between the capacitor plates.

It is represented as 'U'.

<h3>How to determine the potential difference</h3>

Formula:

Potential difference, V is the ratio of the charge to the capacitance of a capacitor.

It is calculated using:

V = Q ÷ C

Where Q = charge 5 × 10∧-5C and C = capacitance 10∧-9

Substitute the values into the equation

Potential difference, V = 5 × 10∧-5 ÷ 10∧-9 = 5 × 10∧4 volts

<h3>How to determine the energy stored</h3>

Formula:

Energy, U = 1 ÷ 2 (QV)

Where Q= charge and V = potential difference across the capacitor

Energy, U = 1 ÷ 2 ( 5 × 10∧-5 × 5 × 10∧4)

= 0.5 × 25 × 10∧-1

= 0.5 × 2.5

= 1. 25 Joules

Therefore, the potential difference across the capacitor is 5 × 10∧4 volts and the energy stored in it is 1. 25 Joules

Learn more about capacitance here:

brainly.com/question/14883923

#SPJ1

6 0

1 year ago

Betty (mass 40 kg), standing on slippery ice, catches her leaping dog (mass 15 kg) moving horizontally at 3.0 m/s. Show that the

MA_775_DIABLO [31]

Answer:

v = 2.18m/s

Explanation:

In order to calculate the speed of Betty and her dog you take into account the law of momentum conservation. The total momentum before Betty catches her dog must be equal to the total momentum after.

Then you have:

$Mv_{1o}+mv_{2o}=(M+m)v$ (1)

M: mass Betty = 40kg

m: mass of the dog = 15kg

v1o: initial speed of Betty = 3.0m/s

v2o: initial speed of the dog = 0 m/s

v: speed of both Betty and her dog = ?

You solve the equation (1) for v:

$v=\frac{Mv_{1o}+mv_{2o}}{M+m}=\frac{(40kg)(3.0m/s)+(15kg)(0m/s)}{40kg+15kg}\\\\v=2.18m/s$

The speed fo both Betty and her dog is 2.18m/s

7 0

2 years ago