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3 years ago

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Es urgente :(

1 answer:

myrzilka [38]3 years ago

7 0

24.98270483 f = C/λ

Explanation:

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The temperature coefficient of a certain conducting material is 5.74 × 10-3 (°C)-1. (a) At what temperature would the resistance

Alex777 [14]

Answer:

Temperature at which the resistance is twice the resistance at $20^{\circ}C$ is $194.216^{\circ}C$

Solution:

As per the question:

Temperature coefficient, $\alpha = 5.74\times 10^{- 3}^{\circ}C$

Reference temperature, $T_{o} = 20^{\circ}C$

Resistance, $R_{t} = 2R_{o}$

Now, using the formula:

$R_{t} = R_{o}(1 + \alpha \Delta T)$

$2R_{o} = R_{o}(1 + \alpha \times (T _ T_{o}))$

$2 = 1 + 5.74\times 10^{- 3}\times (T - 20^{\circ})$

$\frac{1}{5.74\times 10^{- 3}} = T - 20^{\circ}$

$T = 174.216 + 20 = 194.216^{\circ}$

Yes, this temperature holds for all all the conductors of copper, irrespective of the size and shape of the conductor.

5 0

3 years ago

A superball and a clay ball are dropped from a height of 10cm above a tabletop. They have the same mass 0.05kg and the same size

Olenka [21]

Answer:4.08 N

Explanation:

Given data

superball dropped from a height of 10 cm

Mass of ball $\left ( m\right )$ =0.05kg

time of contact $\left ( t\right )$ =34.3 $\times 10^{-3}$ s

Now we know impulse = $Force\times time\ of\ contact$ =Change in momentum

$F_{average}\times t$ = $m\left ( v-(-v)\right )$

and velocity at the bottom is given by

v= $\sqrt{2gh}$

$F_{average}\times 34.3\times 10^{-3}$ = $0.05\left ( 1.4-(-1.4)\right )$

$F_{average}$ =4.081N

5 0

3 years ago

The drum of a washing machine spins at 200 rpm the drum had a radius of 0.5m what will the centripetal force experienced by a to

miskamm [114]

The centripetal force experienced by the towel is 55 N.

The given parameters;

angular speed of the washing machine, ω = 200 rpm
radius of the machine' drum, r = 0.5 m
mass of the towel, m = 0.25 kg

The centripetal force experienced by the towel spinning along the walls of the drum is calculated as follows;

Fc = mrω²

where;

<em>Fc is the centripetal force</em>

<em>ω is angular speed in rad/s</em>

The angular speed in rad/s is calculate as;

$\omega = \frac{200 \ rev}{\min} \times \frac{2\pi \ rad}{1 \ rev} \times \frac{1\min}{60 \ s} \\\\\omega = 20.95 \ rad/s$

The centripetal force experienced by the towel is calculated as;

$F_c = mr\omega ^2\\\\F_c = 0.25 \times 0.5 \times (20.95)^2\\\\F_c = 54.9 \ N \ \approx 55 \ N$

Thus, the centripetal force experienced by the towel is 55 N.

Learn more here: brainly.com/question/20905151

5 0

3 years ago

A student sets a board to pivot about its center. The student then places a box with mass m at some position r from the pivot po

kvv77 [185]

Answer:

The box should be placed at a distance of $\frac{r}{2}$ from the pivot

Explanation:

In order to be in static equilibrium, both Torques have to be the same magnitude, so:

$T_{m} = T_{2m}$ Replacing the formula for Torque:

$m*r = 2m*X$ where X is the distance we need to find.

Solving for X we get:

$X = \frac{r}{2}$

As we can see, the distance does not depend on the actual value of the mass but on the fact of one being twice as much as the other one.

7 0

4 years ago

If the period of a pendulum were 2.4 s on the moon, which has an acceleration due to gravity of 1.67 m/s^2, then how long would

guajiro [1.7K]

<h2>Reffer the attachment </h2>

Mark as brainlist ❤️❤️

5 0

3 years ago