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nevsk [136]
2 years ago
9

A 50 kg bear climbed on the tree branch 10 meters above the ground. If the bear descends to 5 meters above the ground, its poten

tial energy will be decreased by
A/ 4900 J
B/ 2450 J
C/ 2540 J
D/ 2500 J ​
Physics
1 answer:
Simora [160]2 years ago
6 0
<h3>Option A. 4900 J or joules</h3>
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A 50-g chunk of 80 degrees C iron is dropped into a cavity in a very large block of ice at 0 degrees C. Show that 5.5 g of ice w
Alenkasestr [34]

Answer:

5.5g of ice melts when a 50g chunk of iron at 80°C is dropped into a cavity

Explanation:

The concept to solve this problem is given by Energy Transferred, the equation is given by,

Q = mc\Delta T

Where,

Q= Energy transferred

m = mass of water

c = specific heat capacity

\Delta T = Temperature change (K or °C)

Replacing the values where mass is 50g and temperature is 80°C to 0°C we have,

Q = mc\Delta T

Q = 50*0.11*(80-0)

Q = 440cal

Then we can calculate the heat absorbed by m grams of ice at 0°C, then

Q_2 = mL = 80*m

How Q_1=Q_2, so

80m=440

m=\frac{440}{80}

m = 5.5g

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3 years ago
Average speed can be represented by the mathematical expression
nevsk [136]

Average speed is defined as total distance moved in total interval of time

so it is given as

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now here is we show distance by "d" and time by"t"

then we will have mathematical expression as follows

v = \frac{d}{t}

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What type of force are you exerting when you lie on a bed
zysi [14]

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Compression is the answer

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What are two benefits of scientists using a diagram to model the water cycle?
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