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3 years ago

7

A student has connected two generator/motors together. The student turns the crank 20 times and noticed the other crank only tur

ns 12 times. What happened to the "missing" energy?

1 answer:

Rufina [12.5K]3 years ago

6 0

Answer:

eu não consigo entender essa situação o Fim dessa história só pode ter confusão dos iguais com cabeças diferentes a invés de amigas são concorrentes

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A sound wave travels through a column of hydrogen at STP. Assuming a density of rho = 0.0900 kg/m3 and a bulk modulus of β = 1.4

STALIN [3.7K]

Answer:

speed of sound will be 1256 m/sec

Explanation:

We have given density $\rho =0.09kg/m^3$

And bulk modulus $\beta =1.42\times 10^5Pa$

We know that speed of sound in a medium is given by

$v=\sqrt{\frac{\beta }{\rho }}$ , here $\beta$ is bulk modulus and $\rho$ is density

So speed will be $v=\sqrt{\frac{1.42\times 10^5}{0.09 }}=12.56\times 10^2=1256m/sec$

So speed of sound will be 1256 m/sec

4 0

3 years ago

A 64 kg cross-country skier glides over snow. Thecoefficient

BaLLatris [955]

Answer:

The distance traveled by the skier is 5.309 km

Solution:

As per the question:

Mass of the skier, m = 64 kg

Coefficient of friction between the ski and the snow, $\mu_{k} = 0.50$

Mass of snow, M = 5.0 kg

Now,

To calculate the distance, 's' traveled by the skier, in order to melt 5.0 kg of snow:

We know that:

$f = \mu_{k}N$

where

$\mu_{k}$ = coefficient of friction

N = Normal Reaction

N = mg

Thus

$f = \mu_{k}mg$ (1)

Also,

$fs = ML_{f}$ (2)

where

$L_{f} = 3.33\times 10^{5}\ J/kg$ = Latent Heat of fusion

Thus from eqn (1) and (2):

$s = \frac{ML_{f}}{\mu_{k}mg}$

$s = \frac{5\times 3.33\times 10^{5}}{0.50\times 64\times 9.8}$

s = 5.309 km

5 0

3 years ago

According to Newton’s Law of gravity, which of the following is inversely related to the square of the distance from earth?

Dima020 [189]

I think it’s D

I hope this helps ❤️

3 0

3 years ago

Read 2 more answers

3. Which of the following magnetic scenarios will repel each

Nastasia [14]

Answer:

option C (1 and 4)

Explanation:

Like poles repel each other, unlike poles attract each other

7 0

3 years ago

Read 2 more answers

A bat hits a moving baseball. If the bat delivers a net eastward impulse of 1.3 N-s and the ball starts with an initial horizont

Georgia [21]

Answer:

$141.30grams$

Explanation:

First, denote our known values;

$J=1.3N-s(+,east)\\u=-3.8ms^-^1(-,west)\\v=5.4ms^-^1(+,east)\\m=?$

Mass is impulse divided by change in velocity:

$m=\frac{J}{v-u}\\=\frac{1.3}{5.4--3.8}\\\\=\frac{1.3}{9.2}\\=0.1413Kgs$

Hence, the mass of the ball is 141.30grams

3 0

3 years ago