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larisa86 [58]
3 years ago
5

What is the average velocity of a person walking to the store as

Physics
2 answers:
finlep [7]3 years ago
5 0
A. 5 m/s. The answer to your question is this because if you look at the y axis you will get the rate
Vlad [161]3 years ago
4 0

Answer:

a=5m/s

Explanation:

V= s/t

V= 25/5

V=5m/s

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A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half
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Answer: The increase in temperature of the nail after the three blows is 8.0636 Kelvins. The correct option is (d).

Explanation:

Kinetic energy of the hammer ,K.E.=

\frac{1}{2}mv^2=\frac{1}{2}1.00 kg\times (8.50 m/s)^2=36.125 J

Half of the kinetic energy of the hammer is transformed into heat in the nail.

Energy transferred to the nail in one blow =

\frac{1}{2}K.E.=\frac{1}{2}\times 36.125 J=18.0625 J

Total energy transferred after 3 blows,Q =3\times 18.0625 J=54.1875 J

Mass of the nail = 15 g = 0.015 kg

Change in temperature =\Delta T

Specif heat of the steel = c = 448 J/kg K

Q=mc\Delta T

54.1875 J=0.015 kg\times 448 J/kg K\times \Delta T

\Delta T=8.0636 K\approx 8.1 K

The increase in temperature of the nail after the three blows is 8.1  Kelvins.Hence, correct option is (d).

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3 years ago
A solid of density 8000 kgm.. weighs 0.8 kgf in air. When it is completely
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Answer:<em> 0.5kg</em>

Explanation:

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A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds
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Answer:

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