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nataly862011 [7]
3 years ago
12

PLEASE HELP!! WILL GIVE POINTS

Physics
1 answer:
AURORKA [14]3 years ago
3 0

Answer:

49 kg is the mass of the couch.

Explanation:

GPE = mgh

9800 = m * 10 * 20

9800 = 200m

m = (9800/20) = 49 m

Thenks and mark me brainliest :))

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A truck covered 2/7 of a journey at an average speed of 40
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Answer:

The amount of time for the whole journey is 8 hours.

Explanation:

A truck covered 2/7 of a journey at an average speed of 40  mph. Representing 1 the total of the trip traveled, then the rest of the distance traveled is calculated as: 1-\frac{2}{7} =\frac{5}{7}

So if the truck covered the remaining 200 miles at \frac{2}{7}, this means that \frac{5}{7} of the trip represents the 200 miles. So, to calculate the total distance traveled by the truck, you apply the following rule of three: if \frac{5}{7} of the route represents 200 miles, the integer 1 (which represents the total of the route), how many miles are they?

miles=\frac{1*200miles}{\frac{5}{7} } =\frac{7}{5} *200 miles

miles= 280

So the total distance traveled is 280 miles. Since speed is the relationship between the space traveled by an object and the time used for it (speed=\frac{distance}{time}), then if the average of the entire trip was 35 mph and the distance traveled 280 miles, the time is calculated as:

time=\frac{distance}{speed}=\frac{280 miles}{35 mph}

time= 8 h

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If you were trying to kill a fish with a spear, would you aim where you see the fish
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One heater uses 490 W of power when connected by itself to a battery. Another heater uses 250 W of power when connected by itsel
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Answer:

Power will be 166.66 watt when the heater are connected in series

Explanation:

We have given power of the first heater P_1 = 490 watt

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Power is given by P=\frac{V^2}{R}

So 490=\frac{V^2}{R_1}

R_1=\frac{V^2}{490}=0.0020V^2

Similarly R_2=\frac{V^2}{250}=0.04V^2

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