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2 years ago

Melissa's hair stands up on end after she takes her wool hat off in the winter but not in the summer

Physics

1 answer:

Temka [501]2 years ago

8 0

Answer:

Static electricity

Explanation:

A static reaction is transpiring with the surrounding air as well as her hair.

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Aluminum allows for the flow of electrons, while glass does not. Would an aluminum wire surrounded by glass be an effective desi

pantera1 [17]

answer

Explanation:

I do not think that I would because even though its a conductor in the insulator I think it would insulate it before it will work (not sure if that makes sense)

3 0

2 years ago

What is the electric potential energy of an electron at the negative end of the cable, relative to the positive end of the cable

VashaNatasha [74]

Answer:

Electric potential energy at the negative terminal: $1.92\cdot 10^{-18}J$

Explanation:

When a particle with charge $q$ travels across a potential difference $\Delta V$ , then its change in electric potential energy is

$\Delta U = q \Delta V$

In this problem, we know that:

The particle is an electron, so its charge is

$q=-1.60\cdot 10^{-19}C$

We also know that the positive terminal is at potential

$V_+=0V$

While the negative terminal is at potential

$V_-=-12 V$

Therefore, the potential difference (final minus initial) is

$\Delta V = -12-0 = -12 V$

So, the change in potential energy of the electron is

$\Delta U = (-1.6\cdot 10^{-19})(-12)=1.92\cdot 10^{-18}J$

This means that the electron when it is at the negative terminal has $1.92\cdot 10^{-18}J$ of energy more than when it is at the positive terminal.

Since the potential at the positive terminal is 0, this means that the electric potential energy of the electron at the negative end is

$1.92\cdot 10^{-18}J$

3 0

4 years ago

A 7.2 m long ramp is set at an angle of 42 degrees with the floor. An 11kg box is pushed up the ramp. What is the change in GPE

Evgesh-ka [11]

Answer:

Answer is 519.3 J

Explanation:

GPE = m x g x h

Object Height is equal to 7.2 x sin42 = 7.2 x 0.669 = 4.817m

GPE = 11 x 9.8 x 4.817 =519.3 J

Most probably m value (11kg) has been used as 7.2 mistakenly.

7 0

4 years ago

Will mark as brainliest . pls help

ipn [44]

Answer:

answer D

Explanation:

circuit breaker is useful when you do something with your domestic electric circuit..

3 0

3 years ago

Can someone help me solve these two equations?

miskamm [114]

Answer:

1a. 0.030 s

1b. 15×10¹⁰ kg m²/s²

Explanation:

Remember order of operations (PEMDAS).

1a. $T_{s} =2\pi \sqrt{\frac{4.5\times10^{-2}\ kg }{2.0\times10^{3}\ kg/s^{2} } }$

Start by dividing the numbers, the powers of 10 (using exponent rules), and the units.

$T_{s} =2\pi \sqrt{\frac{4.5}{2.0} \frac{10^{-2}}{10^{3}} \frac{kg}{kg/s^{2}}}\\T_{s} =2\pi \sqrt{2.25 \times10^{-2-3}\ s^{2}}\\T_{s} =2\pi \sqrt{2.25 \times10^{-5}\ s^{2}}$

Take the square root:

$T_{s} =2\pi \sqrt{2.25} \sqrt{10^{-5}} \sqrt{s^{2}}\\T_{s} =2\pi \times1.5 \times10^{-2.5}\ s$

Finally, multiply (you'll need a calculator):

$T_{s} \approx 0.030\ s$

1b. $K=\frac{1}{2} (6.6\times10^{2}\ kg)(2.11\times10^{4}\ m/s)^{2}$

Start by squaring the last term:

$K=\frac{1}{2} (6.6\times10^{2}\ kg)(2.11^{2}\times10^{4\times2}\ m^{2}/s^{2})\\K=\frac{1}{2} (6.6\times10^{2}\ kg)(4.4521\times10^{8}\ m^{2}/s^{2})$

Now like before, multiply the numbers, the powers of 10 (using exponent rules), and the units:

$K=\frac{1}{2} (6.6\times4.4521)(10^{2+8})(kg\ m^{2}/s^{2})\\K=\frac{1}{2} (29.38386)(10^{10})(kg\ m^{2}/s^{2})\\K\approx15\times10^{10}\ kg\ m^{2}/s^{2}$

8 0

3 years ago