An austrain who lived in vienna who composed graetest music for waltz dance<br>

Which one of these is a chemical change?

satela [25.4K]

Burning a log because you are turning the log into ash from wood.

3 0

4 years ago

Steelhead trout migrate upriver to spawn. Occasionally they need to leap up small waterfalls to continue their journey. Fortunat

Brums [2.3K]

Answer:

s = 3.26 m

Explanation:

Given that,

Water leaves at a speed of 8 m/s

We need to find the maximum height that steelhead can jump. Let it can jump to a height of h.

At maximum height, final speed is equal to 0. We can use third equation of motion to find the maximum height.

$v^2-u^2=2as$

a = -g

$-u^2=-2gs\\\\s=\dfrac{u^2}{2g}\\\\s=\dfrac{(8)^2}{2\times 9.8}\\\\=3.26\ m$

Hence, the maximum height is 3.26 m.

7 0

3 years ago

What protists do not have definite shape

enyata [817]

Amoeba

Explanation:A type of protozoan that does not have a definite shape. It moves by using pseudo pods (false feet).

6 0

3 years ago

Which of the following will increase if the voltage in a circuit is increased?

Arlecino [84]

Answer:

A and D

Explanation:

6 0

3 years ago

A 0.500-mol sample of an ideal monatomic gas at 400 kPa and 300 K, expands quasi-statically until the pressure decreases to 160

Marianna [84]

Answer:

(a). The final volume is 2.5 times the initial volume.

The work done is 1143 J.

(b). The final temperature is 207.9 K

The work done is 574 J.

Explanation:

Given that,

Sample of an ideal gas = 0.500 mol

Initial pressure = 400 kPa

Final pressure = 160 kPa

Temperature = 300 K

(a) for isothermal,

Temperature will be same.

We need to calculate the volume of gas

$P_{f}V_{f}=P_{i}V_{i}$

$V_{f}=(\dfrac{P_{i}}{P_{f}})V_{i}$

Put the value into the fomrula

$V_{f}=(\dfrac{400}{160})V_{i}$

$V_{f}=2.5 V_{i}$

We need to calculate the work done

Using equation of energy

$dQ=dW$

$dQ=nRTln(\dfrac{P_{in}}{P_{f}})$

$dQ=0.500\times8.314\times300\times ln(\dfrac{400}{160})$

$dQ=1143\ J$

(b). For adiabatic,

No transfer of heat between system and surroundings

We need to calculate the final temperature

Using formula of gas

$P_{f}^{1-\gamma}T_{f}^{\gamma}=P_{i}^{1-\gamma}T^{\gamma}$

$T_{f}=(\dfrac{P_{i}}{P_{f}})^{\frac{1-\gamma}{\gamma}}T_{i}$

Put the value into the formula

$T_{f}=(\dfrac{400}{160})^{\frac{1-\frac{5}{3}}{\frac{5}{3}}}\times300$

$T_{f}=207.9\ K$

We need to calculate the wok done in adiabatic

Using formula of work done

$W=\dfrac{nR(T_{i}-T_{f})}{\gamma-1}$

$W=\dfrac{0.500\times8.314\times(300-207.9)}{\dfrac{5}{3}-1}$

$W=574\ J$

Hence, (a). The final volume is 2.5 times the initial volume.

The work done is 1143 J.

(b). The final temperature is 207.9 K

The work done is 574 J.

6 0

3 years ago

An austrain who lived in vienna who composed graetest music for waltz dance​

An austrain who lived in vienna who composed graetest music for waltz dance