Which two statements best determine whether an engineering design is

What’s the difference between weight and support force? *oof*

grandymaker [24]

Force is a measure of the interaction between bodies, mass is a measure of the amount of material in an object, weight is the gravitational force acting on a body (although for trading purposes it is taken to mean the same as mass) and load usually means the force exerted on a surface or body

4 0

3 years ago

An aluminum rod of length 3.3 m and crosssectional area 3.8 cm2 is inserted vertically into a thermally insulated vessel contain

Sveta_85 [38]

Answer:

V_vap = 161.2 L

Explanation:

The total mass of the aluminum rod is given as;

m = ρ∙V = ρ∙L∙A

Where;

ρ is density = 2700 kg/m³

L is length = 3.3m

A is cross sectional area = 3.8 cm² = 3.8 x 10⁻⁴ m²

Thus;

m = 2700kg/m³•3.3m•3.8 × 10⁻⁴m²

= 3.3858kg

By cooling down the submerged half of the aluminum rod releases an heat amount of

Q = (1/2)∙m∙cp∙∆T

Where;

cp is specific heat of aluminum aluminum = 900 J/kg

∆T is change in temperature = 274 - 4.2 = 269.8 K

Thus;

Q = (1/2)•3.3858•900•(269.8)

= 411069.978 J

The liquid absorbs this heat and vaporizes partially, such that the heat equals vaporized mass times latent heat of vaporization:

Q = m_vap•∆h_vap

Making m_vap the subject;

m_vap∙ = Q/∆h_vap

Where ∆h_vap is latent heat of vaporization given as 20900J/kg

Thus,

m_vap∙ = 411069.978/20900

= 19.668 kg

Let's divide this mass by the density of liquid helium and we get the liquid volume which has vaporized:

V_vap∙= m_vap/ρ

V_vap∙ = 19.668/122

V_vap∙ = 0.1612 m³

Converting to litres;

V_vap = 0.1612 x 1000

V_vap = 161.2 L

3 0

3 years ago

A long wire carrying I=1.1A of constant current oriented North-to-South (and the current is running northwards) is placed horizo

Tema [17]

Answer:

The absolute value of the angular deviation is 39.3°.

Explanation:

Given that,

Current = 1.1 A

Distance = 0.9 cm

Magnetic field = 20μT

We need to calculate the magnetic field due to wire

Using formula of magnetic field

$B=\dfrac{\mu_{0}I}{2\pi d}$

Put the value into the formula

$B=\dfrac{4\pi\times10^{-7}\times1.1}{2\pi\times0.9\times10^{-2}}$

$B=24.4\times10^{-6}\ T$

$B=24.4\ \mu T$

We need to calculate the absolute value of the angular deviation

Using formula of direction

$\theta=\tan^{-1}(\dfrac{B_{E}}{B_{w}})$

$\theta=\tan^{-1}(\dfrac{20 \mu}{24.4 \mu})$

$\theta=39.3^{\circ}$

Hence, The absolute value of the angular deviation is 39.3°.

5 0

3 years ago

A. Calculate the electric potential energy stored in a capacitor that stores <img src="https://tex.z-dn.net/?f=3.40%20x%2010%5E%

sertanlavr [38]

Part a)

As we know that energy stored inside the capacitor is given as

$U = \frac{1}{2}CV^2$

for a given capacitor we know

$Q = CV$

Now we can use it in above equation to find the energy

$U = \frac{1}{2}QV$

$U = \frac{1}{2}(3.4\times 10^{-6})(24)$

$U = 40.8\times 10^{-6} J$

PART b)

If two negative charges are hold near to each other and then released

Then due to mutual repulsion they start moving away from each other

Due to mutual repulsion as the two charges moving away the electrostatic potential energy of two charges will convert into kinetic energy of the two charges.

So here as they move apart kinetic energy will increase while potential energy will decrease

Part c)

As we know that capacitance is given as

$C = \frac{Q}{V}$