Find the current drawn by a 1OOO-W steam iron from a 120-V line.

thamizh selvi
2022-09-24

Find the current drawn by a 1OOO-W steam iron from a 120-V line.

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asked 2021-04-25

Flux through a Cube (Eigure 1) A cube has one corner at the origin and the opposite corner at the point (L, L, L). The sides of the cube are parallel to the coordinate planes

asked 2022-08-22

1. The resistance of a wire of length 10 m is 2 ohm. If the area of cross section of thewire is $2\times {10}^{-7}\text{}{m}^{2}$, determine its (a) resistivity, and (b) conductivity

2. Calculate the (a) resistivity and the (b) conductivity of a material that has a lengthof 15 m and a cross-sectional area of $5\times {10}^{-8}\text{}{m}^{2}$ and a resistance (R) of 5 $\mathrm{\Omega}$

2. Calculate the (a) resistivity and the (b) conductivity of a material that has a lengthof 15 m and a cross-sectional area of $5\times {10}^{-8}\text{}{m}^{2}$ and a resistance (R) of 5 $\mathrm{\Omega}$

asked 2022-05-08

How can we evaluate

${\int}_{0}^{1}\frac{{\mathrm{log}}^{2}(x+1)\mathrm{log}({x}^{2}+1)}{{x}^{2}+1}dx$

Any kind of help is appreciated.

${\int}_{0}^{1}\frac{{\mathrm{log}}^{2}(x+1)\mathrm{log}({x}^{2}+1)}{{x}^{2}+1}dx$

Any kind of help is appreciated.

asked 2022-04-06

A submarine of mass m is travelling at max power and has engines that deliver a force F at max power to the submarine. The water exerts a resistance force proportional to the square of the submarine's speed v.

The submarine increases its speed from ${v}_{1}$ to ${v}_{2}$, show that the distance travelled in this period is $\frac{m}{2k}\mathrm{ln}\frac{F-k{v}_{1}^{2}}{F-k{v}_{2}^{2}}$ where k is a constant.

I've found $\frac{dv}{dt}=\frac{1}{m}(F-k{v}^{2})$ using $\sum F=ma$ but I am struggling to progress further using integration or the fact that $\frac{dv}{dt}=v\frac{dv}{dx}=\frac{d}{dx}(\frac{1}{2}{v}^{2})=\frac{{d}^{2}x}{d{t}^{2}}$ which is how I've been taught to solve resisted motion questions.

The submarine increases its speed from ${v}_{1}$ to ${v}_{2}$, show that the distance travelled in this period is $\frac{m}{2k}\mathrm{ln}\frac{F-k{v}_{1}^{2}}{F-k{v}_{2}^{2}}$ where k is a constant.

I've found $\frac{dv}{dt}=\frac{1}{m}(F-k{v}^{2})$ using $\sum F=ma$ but I am struggling to progress further using integration or the fact that $\frac{dv}{dt}=v\frac{dv}{dx}=\frac{d}{dx}(\frac{1}{2}{v}^{2})=\frac{{d}^{2}x}{d{t}^{2}}$ which is how I've been taught to solve resisted motion questions.

asked 2022-05-15

Derivative of ${e}^{-x}$

asked 2022-05-14

The wires in (Figure 1) all have the same resistance; the length and radius of each wire are noted.Rank in order, from largest to smallest, the resistivities ${\rho}_{1}$ to ${\rho}_{5}$ of these wires.

asked 2022-04-12

Prove or Disprove that $\left|\frac{{e}^{2i\theta}-2{e}^{i\theta}-1}{{e}^{2i\theta}+2{e}^{i\theta}-1}\right|=1$

This is a step in an attempt to solve a much larger problem, thus I'm fairly sure it's true but not absolutely sure. It looks like it should be simple but it's resisted all my attempts so far.

This is a step in an attempt to solve a much larger problem, thus I'm fairly sure it's true but not absolutely sure. It looks like it should be simple but it's resisted all my attempts so far.