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4 years ago

What is the difference between a general and a specific tolerance, and how can you tell the difference on a drawing?

1 answer:

6 0

During the reading of a blueprint, a general tolerance pertains to all dimensions that are not independently identified. All tolerances are +\- .030. General tolerances are mostly found in the blueprint’s set of information. Let’s say for example, a compact tolerance is required, then a specific tolerance is considered for specific areas of the blueprint. These kinds of tolerances are commonly found along the affected area.

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A car’s headlights dissipate 40 W on low beam and 50 W on high beam. Is there more or less resistance in the high-beam filament?

love history [14]

Answer:

The high-beam filament has more resistance than low beam filament.

Explanation:

To determine if the 50 W dissipated by a car’s headlights on high beam, has more or less resistance, formula for power dissipated in the filament is used.

Power = IV

Voltage =IR

∴ Power = I*IR = I²R

where;

I is the current

V is the voltage

R is the resistance

From the equation above, Power dissipated is directly proportional to Resistance.

Hence, the high-beam filament has more resistance than low beam filament.

3 0

3 years ago

Find the kinetic energy ofan electron that moves at half the speed of light to four significant digits.

Vlad1618 [11]

Answer:

Ke=electron kinetic energy= $10.24*10^{33} J$

Explanation:

The electron has a mass of $9.1*10^{-31} kg$

The speed of light in a vacuum is a universal constant with the value 299 792 458 m / s (186 282,397 miles / s), although it is usually close to $3*10^{8} \frac{m}{s}$

Kinetic energy (K) is the energy associated with bodies that are in motion, depends on the mass and speed of the body and is calculated using the formula:

$K=\frac{1}{2} *m*v^{2}$ Equation(1)

K=kinetic energy (J)

m =mass of the body (kg)

v= speed of the body $(\frac{m}{s} )$

for this problem We replace in the equation (1)

$me=9.1*10^{-31} kg$ = electron mass

$ve=1.5*10^{8} \frac{m}{s}$ =Half the speed of light

=electron speed

We replace in the equation (1) :

$Ke=\frac{1}{2}*me*ve^{2}$

$Ke=\frac{1}{2} *9.1*10^{-31} *(1.5*10^{8} )^{2}$

$Ke=4.55*10^{-31} *(1.5)^{2} *(10^{8} )^{2}$

$Ke=10.24*10^{33} J$

The energy kinetic of the electron is $10.24*10^{33} Joules$

7 0

3 years ago

A quantity of gas is contained in a sealed container of fixed volume. The temperature of the

Alchen [17]

Answer:

If the Kelvin temperature of a gas is increased, the volume of the gas increases. This can be understood by imagining the particles of gas in the container moving with a greater energy when the temperature is increased.

Explanation:

If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure. Conversely if you cool the molecules down they will slow and the pressure will be decreased.

To calculate a change in pressure or temperature using Gay Lussac's Law.

6 0

3 years ago

All BUT one factor will increase the work output of a machine and decrease the amount of thermal energy created and released. Th

Serggg [28]

I would say C because extra friction would make the machine work more and therefore create more heat.

6 0

4 years ago

Read 2 more answers

A wave is described by the expression y(x, t)= (3.0 cm) × cos(1.5x − 50t), where x is in m and t is in s.

Nadya [2.5K]

Answer:

Speed = 209.5m/s

Direction = Positive x direction

Explanation:

The general wave equation expressing the displacement of a wave travelling in the positive x-direction is written as follows;

y(x, t) = y x cos(2 $\pi$ kx - 2 $\pi$ ft) --------------------(i)

Where;

y(x, t) = the position of the wave at time t

y = the amplitude of the wave,

k = the wave number

f = frequency of the wave

Given;

y(x, t)= (3.0 cm) × cos(1.5x − 50t) -------------------(ii)

Comparing equations(i) and (ii)

=> y = amplitude

=> y = 3.0cm

=> y = 0.03m

Also,

=> 2 $\pi$ kx = 1.5x

=> k = $\frac{0.75}{\pi }$

=> wave number (k) = $\frac{0.75}{\pi }$

Also,

=> 50t = 2 $\pi$ ft

=> f = frequency

=> f = $\frac{25}{\pi }$ Hz

But,

=> wavelength (λ) = $\frac{2\pi }{k}$ ------- (iii)

Substituting for k = $\frac{0.75}{\pi }$ in equation (iii)

=> λ = (2 $\pi$ ) ÷ $\frac{0.75}{\pi }$

=> λ = (2 $\pi$ ) x $\frac{\pi }{0.75}$ (where $\pi$ = 3.142)

=> λ = 26.33m

(a) To calculate the speed (v) of the wave, we use the formula;

v = f x λ

where f = $\frac{25}{\pi }$ and λ = 26.33

=> v = $\frac{25}{\pi }$ x 26.33

=> v = 209.5m/s

(b) To get the direction in which the wave is travelling, a quick look at the sign between the x and t terms (1.5x - 50t) in the given equation (ii) will suffice.

A negative sign shows that the wave is travelling in the +x direction

A positive sign shows that the wave is travelling in the -x direction.

In this case, the sign between these terms is negative. This shows that the wave is travelling in the positive x direction.

8 0

3 years ago