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3 years ago

7

What would be the final temperature of the system if all the heat lost by the copper block were absorbed by the water in the cal

orimeter?

1 answer:

ivanzaharov [21]3 years ago

5 0

<span>Answer: q Cu = q H2O so, (121g)(0.385 J/g-K)(100.4C-x) = (150g)(4.18 J/g-K)(x-25.1C) x= 30.3C</span>

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A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadil

krok68 [10]

Answer:

The Resultant Induced Emf in coil is 4∈.

Explanation:

Given that,

A coil of wire containing having N turns in an External magnetic Field that is perpendicular to the plane of the coil which is steadily changing. An Emf (∈) is induced in the coil.

To find :-

find the induced Emf if rate of change of the magnetic field and the number of turns in the coil are Doubled (but nothing else changes).

So,

Emf induced in the coil represented by formula

∈ = $-N\frac{d\phi}{dt}$ ...................(1)

Where:

. $\phi = BAcos\theta$ { B is magnetic field }

{A is cross-sectional area}

. $N =$ No. of turns in coil.

. $\frac{d\phi}{dt} =$ Rate change of induced Emf.

Here,

Considering the case :-

$N1 = 2N$ & $\frac{d\phi1}{dt} = 2\frac{d\phi}{dt}$

Putting these value in the equation (1) and finding the new emf induced (∈1)

∈1 = $-N1\times\frac{d\phi1}{dt}$

∈1 = $-2N\times2\frac{d\phi}{dt}$

∈1 = $4 [-N\times\frac{d\phi}{dt}]$

∈1 = 4∈ ...............{from Equation (1)}

Hence,

The Resultant Induced Emf in coil is 4∈.

8 0

4 years ago

An object has 600J of kinetic energy from its motion and a speed of 10m/s. What is it's mass?

Gemiola [76]

Answer:

The mass is 12 kg

Explanation:

KE = $\frac{1}{2}$ mv²

Substitute:

600 = $\frac{1}{2}$ m(10)²

600 = $\frac{1}{2}$ m 100

600 = 50m

m = $\frac{600}{50}$

m = 12

4 0

3 years ago

Four of the wavelengths of the Balmer series occur in the visible spectrum (656 nm, 486 nm, 434 nm, and 410 nm). In which region

djyliett [7]

Answer: radio waves, microwaves, infrared waves.

Explanation:

Electromagnetic spectrum increases in wavelength and decreases with frequency in the following order

Gamma ray, X ray, Ultraviolet rays, Visible light, Infrared rays, Radio waves.

Since 397nm is greater than the value of visible spectrum, this shows that radio waves, microwaves and infrared wave falls in the spectrums of the wavelength value.

4 0

3 years ago

In which orbitals would the valence electrons for selenium (Se) be placed?

LUCKY_DIMON [66]

s orbital and p orbital

hope this helps :)

8 0

3 years ago

How will the solubility of a gas solute change if the pressure above the solution is reduced?

Hoochie [10]

If the pressure above a solution containing a gas solute is reduced, the limit of the gas's solubility will decrease.

6 0

4 years ago

Read 2 more answers