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3 years ago

Electric Charge (guided inquiry)

Physics

1 answer:

Sedaia [141]3 years ago

8 0

Answer:

It looks like you have some writing to do ,(-:

Explanation:

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The answer is earth.

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Explain why not everyone can become a bodybuilder, even if they train hard enough.

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People have diffrent body builds and bone structure

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3 years ago

4. The chart shows melting and boiling points of

kondor19780726 [428]

Answer:

The correct option is A

Explanation:

Firstly, it should be noted that the freezing point of a substance can be assumed to be melting point of that substance because a substance will normally change from liquid to solid (freezes) at the same point it changes from solid to liquid (melts). For example, water freezes at 0°C and also starts melting at 0°C.

Thus, the substance with the lowest melting point among the substances mentioned in the question is alcohol (ethanol) with the melting point of -114°C. Hence, ethanol also has the lowest freezing point thereby freezing at the lowest temperature.

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3 years ago

A wave on the ocean surface with wavelength 44 m travels east at a speed of 18 m/s relative to the ocean floor. If, on this stre

inessss [21]

Answer:

A)t=1.375s

B)t=11s

Explanation:

for this problem we will assume that the east is positive while the west is negative, what we must do is find the relative speed between the wave and the powerboat, and then with the distance find the time for each case

ecuations

V=Vw-Vp (1)

V= relative speed

Vw= speed of wave

Vp=Speesd

t=X/V(2)

t=time

x=distance=44m

A) the powerboat moves to west

V=18-(-14)=32m/s

t=44/32=1.375s

B)the powerboat moves to east

V=18-14=4

t=44/4=11s

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3 years ago

The specific heat of gold is 0.126 J/g°C. What mass of gold would change its temperature from 25.0 °C to 60.0 °C with the additi

fiasKO [112]

The amount of heat energy needed to increase the temperature of a substance by $\Delta T$ is given by:
 $Q=m C_s \Delta T$ 
where m is the mass of the substance, Cs is its specific heat capacity and $\Delta T$ is the increase in temperature of the substance.

In this problem, we have a certain mass m of gold, with specific heat capacity $C_s=0.126 J/g^{\circ}C$ , to which we add Q=2825 J of energy. Its temperature increases by $\Delta T=60-25=35 ^{\circ}C$ . Therefore, if we re-arrange the previous equation, we can find the mass of the block of gold:
 $m= \frac{Q}{C_s \Delta T} = \frac{2825J}{0.126\cdot 35}} =641 g$ 
So, the correct answer is B.

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3 years ago

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