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mihalych1998 [28]

3 years ago

8

A car takes 2 hour to travel 300 km along a main road and then ½ hour to travel 30 km along a side road. What is the average spe

ed of the car for the whole journey?
also write steps

1 answer:

VashaNatasha [74]3 years ago

4 0

Steps are in the image, hope this helps :)

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1. Water flows through a hole in the bottom of a large, open tank with a speed of 8 m/s. Determine the depth of water in the tan

lora16 [44]

Answer:

3.26m

Explanation:

See attached file

5 0

3 years ago

When a charged capacitor is connected to earth, it discharges and the voltage V across it will decrease according to the equatio

algol [13]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

For convenience write RC=D and solve the ODE dV/dt=-V/D which gives
<span>V=Ae^(-t/D) by separating the variables. </span>
<span>When t=0, V=10 and this gives A=10, </span>
<span>when t=2, V=1 giving 1=10e^(-2/D) and you can find D by taking lns of </span>
<span>each side. D=RC, so R=D/C </span>
<span>You should get 2.90X10^5 ohms</span>

4 0

4 years ago

For a particular reaction, Δ H ∘ = − 93.8 kJ and Δ S ∘ = − 156.1 J/K. Assuming these values change very little with temperature,

svetoff [14.1K]

To solve this problem it is necessary to apply the concepts related to Gibbs free energy and spontaneity

At constant temperature and pressure, the change in Gibbs free energy is defined as

$\Delta G = \Delta H - T\Delta S$

Where,

H = Entalpy

T = Temperature

S = Entropy

When the temperature is less than that number it is negative meaning it is a spontaneous reaction. $\Delta G$ is also always 0 when using single element reactions. In numerical that implies $\Delta G = 0$

At the equation then,

$\Delta G = \Delta H - T\Delta S$

$0 = \Delta H - T\Delta S$

$\Delta H = T\Delta S$

$T = \frac{\Delta H}{\Delta S}$

$T = \frac{-93.8kJ}{-156.1J/K}$

$T = \frac{-93.8*10^3J}{-156.1J/K}$

$T = 600.89K$ }

Therefore the temperature changes the reaction from non-spontaneous to spontaneous is 600.89K

5 0

3 years ago

Who wants to do my missing physics work

kotegsom [21]

Answer:

<h2>WHAT IF I HATE PHYSICS ?</h2>

4 0

3 years ago

PLS THIS IS DUE IN 2 MINUTES

Tom [10]

Answer:

The toy car. An object that isn't moving has no momentum

Explanation:

3 0

3 years ago