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snow_tiger [21]

3 years ago

8

Directions: identify the input work and output work in the different situations.

1 answer:

coldgirl [10]3 years ago

4 0

Answer:

it would have to be 1 or maybe 2

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A brass rod with a mass of 0.300 kg slides on parallel horizontal iron rails, 0.440 m apart, and carries a current of 15.0 A. Th

Digiron [165]

Answer:

The magnitude of the magnetic field is $B = 0.0890 \ T$

Explanation:

From the question we are told that

The mass of the rod is $m =0.300 \ kg$

The distance of separation is $d = 0.440 \ m$

The current is $I = 15.0 \ A$

The coefficient of friction is $\mu = 0.300$

Generally for the rod the rod to continue moving at a constant speed

The frictional force must equal to the magnetic field force so

$F_m = F_f$

Where $F_m = B* I * d$

and $F_f = \mu * m * g$

$B*I *d = \mu * m * g$

=> $B = \frac{\mu * m * g }{I * d }$

substituting values

$B = \frac{0.2 * 0.300 * 9.8 }{ 15 * 0.440 }$

$B = 0.0890 \ T$

8 0

3 years ago

The critical angle in air for a particular type of glass is 39.0°. What is the speed of light in this class glass? (c = 3.00 × 1

hodyreva [135]

Answer:

speed of light in glass ≈ 1.89* $10^{8}m/s$

Explanation:

refractive index (n) = $\frac{1}{sinC}$ .......................equation 1

refractive index (n) = velocity of light in air/ velocity of light in medium ....equ2

equate equation 1 and two;

$\frac{1}{sinC} = \frac{c}{speed of light in glass}$

speed of light in glass = c*sinC

= $3*10^{8}*sin39$ °

speed of light in glass = 188,796,117.314 m/s

speed of light in glass ≈ 1.89* $10^{8}m/s$

7 0

3 years ago

(Another tomato/skyscraper problem.) You are looking out your window in a skyscraper, and again your window is at a height of 45

Ivan

Answer:

1027.2 m

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 32.2 ft/s

$s=ut+\frac{1}{2}at^2\\\Rightarrow u=\frac{s-\frac{1}{2}at^2}{t}\\\Rightarrow u=\frac{450-\frac{1}{2}\times 32.2\times 2^2}{2}\\\Rightarrow u=192.8\ ft/s$

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{192.8^2-0^2}{2\times 32.2}\\\Rightarrow s=577.20\ m$

The height the tomato would fall is 450+577.2 = 1027.2 m

6 0

4 years ago

A wave travels at a constant speed. How does the wavelength

Natali [406]

Answer: The wavelength changes by a factor of $\frac{1}{2}$

Explanation:

The equation of the speed $v$ of a wave is:

$v=\lambda f$

Where:

$v$ is the speed, that remains unchanged

$\lambda$ is the wavelength

$f$ is the frequency

Isolating $\lambda$ we have:

$\lamba=\frac{v}{f}$

Now, if we increase the frequency by a factor of 2:

$\lambda=\frac{v}{2f}$

$\lambda=\frac{1}{2} \frac{v}{f}$ This means the wavelength changes by a factor of $\frac{1}{2}$

4 0

3 years ago

What happens when a solid liquid or gas is heated?

Lynna [10]

Solid turns to a liquid, liquid is a gass and idk gass

5 0

4 years ago