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2 years ago

12

As temperature increases, ________. Group of answer choices the resistance of a conductor remains the same the resistance of a c

onductor increases the resistance of a conductor decreases the voltage of the conductor decreases

1 answer:

amm18122 years ago

6 0

Answer:

resistance of a conductor increases

Explanation:

The resistance of conductors is directly proportional to the temperature of the conductor. This implies that when the temperature of the conductor is increased, the resistance of the conductor increases likewise.

This is applied in the resistance thermometer. Resistance thermometers are useful for accurate temperature measurements at very high or very low temperatures.

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A (11.4 A) ohm device is connected to a 115 V outlet. If the cost of the electrical energy is $0.16/kWh, determine the cost of r

Scrat [10]

Answer:

$6.68

Explanation:

The current running through the device would be its outlet voltage divided by the resistance:

I = U/R = 115 / 11.4 = 10.09 A

The power generated by this device is the product of its current and voltage

P = IU = 10.09 * 115 = 1160 W or 1.16 kW

If running this device for 36 hours then the total energy it would consume is

E = Pt = 1.16 * 36 = 41.76 kWh

Therefore the total cost of electrical energy is

C = Ec = 41.76*0.16 = $6.68

4 0

2 years ago

Astronomers observe a spectral analysis of a distant star where a particular element has a spectral line with a wavelength of 66

tekilochka [14]

Answer:

(a). The velocity of star is $8.1\times10^{6}\ m/s$ and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

Explanation:

Given that,

Wavelength of spectral line = 663 nm

Wavelength of spectral line in lab = 645 nm

(a). We need to calculate the velocity

Using doppler's effect

$\Delta \lambda=\dfrac{v}{c}\lambda$

Where, $\Delta\lambda$ = change in wavelength

v = velocity

c = speed of light

Put the value into the formula

$663-645=\dfrac{v}{3\times10^{8}}\times663$

$v=\dfrac{3\times10^{8}(663-645)}{663}$

$v=8144796.38\ m/s$

$v=8.1\times10^{6}\ m/s$

The direction of star toward the earth.

(b). Speed = 7800 m/s

We need to calculate the shift

Using formula of shift

$\Delta \lambda=\lambda(\sqrt{\dfrac{1+\dfrac{v}{c}}{1-\dfrac{v}{c}}}-1)$

Put the value into the formula

$\Delta \lambda=645\times(\sqrt{\dfrac{1+\dfrac{7800}{3\times10^{8}}}{1-\dfrac{7800}{3\times10^{8}}}}-1)$

$\Delta\lambda=0.0168\ nm$

This shift is small compare to the the movement of Earth around the sun.

Hence, (a). The velocity of star is $8.1\times10^{6}\ m/s$ and the direction of star toward the earth.

(b). The shift is 0.0168 nm.

7 0

2 years ago

If a green ball has a greater momentum than an orange ball and both balls are moving at the same velocity, then _________.

lubasha [3.4K]

If a green ball has a greater momentum than an orange ball and both balls are moving at the same velocity, then _________.

A. The green ball has a greater mass

<u>Momentum = mass x velocity.</u>

3 0

2 years ago

Read 2 more answers

A student decides to give his bicycle a tune up. He flips it upside down (so there's no friction with the ground) and applies a

aleksklad [387]

Answer:

$V=9.2565m/s$

Explanation:

From the question we are told that:

Force $F = 34 N$

Time $t = 0.6 s$

Length of pedal $l_p=16.5cm \approx0.165m$

Radius of wheel $r = 33 cm = 0.33 m$

Moment of inertia, $I = 1200 kgcm2 = 0.12 kg.m2$

Generally the equation for Torque on pedal $\mu$ is mathematically given by

$\mu=F*L\\\mu=34*0.165$

$\mu=5.61N.m$

Generally the equation for angular acceleration $\alpha$ is mathematically given by

$\alpha=\frac{\mu}{l}$

$\alpha=\frac{5.61}{0.12}$

$\alpha=46.75$

Therefore Angular speed is \omega

$\omega=\alpha*t$

$\omega=(46.75)*(0.6)$

$\omega=28.05rad/s$

Generally the equation for Tangential velocity V is mathematically given by

$V=r\omega$

$V=(0.33)(28.05)$

$V=9.2565m/s$

5 0

2 years ago

What is the formula for amplitude?

Vesna [10]

Explanation:

In periodic motion, amplitude is half the distance between the minimum and the maximum.

A = (max - min) / 2

8 0

2 years ago