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mamaluj [8]
3 years ago
12

Kinetic Energy Problems = KE = 0.5m x 12

Chemistry
1 answer:
Brut [27]3 years ago
8 0

Explanation:

The kinetic energy of an object is given by :

K=\dfrac{1}{2}mv^2

1. Mass, m = 5 kg

Speed, v = 2 m/s

K_1=\dfrac{1}{2}\times 5\times (2)^2\\\\=10\ J

2. Mass, m = 71 kg

Speed, v = 1 m/s

K_2=\dfrac{1}{2}\times 71\times (1)^2\\\\=35.5\ J

3.  Mass, m = 71 kg

Speed, v = 5 m/s

K_3=\dfrac{1}{2}\times 71\times (5)^2\\\\=887.5\ J

4. Mass, m = 1816 kg

Speed, v = 25 m/s

K_4=\dfrac{1}{2}\times 1816\times (25)^2\\\\=567500\ J

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4. How many J of energy are needed to raise the temperature of 165 g of water from 10.55°C to 47.32°C?
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Answer:

Q = 25360.269 j

Explanation:

Given data:

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ΔT  = 36.77 °C

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Q = 165 g . 4.18 j/g.°C . 36.77 °C

Q = 25360.269 j

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