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AlexFokin [52]
3 years ago
7

A running is training to compete in a marathon. During his training session he runs at anaverage speed of 4.5 m/s. If his traini

ng session lasted for 130 minutes, how long did he run?
Physics
1 answer:
Radda [10]3 years ago
8 0

Answer:

It would be 565m/s.

Explanation:

130 × 4.5=565

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Answer:

a=5.51\ m/s^2

Explanation:

Given that,

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The force acting on the bag = 80 N

The force of friction = 32 N

We need to find the acceleration of the bag of acorns.

Net force acting on it is = 80 N - 32 N

= 48 N

Let a be the acceleration of the bag of acorns. So,

F = ma

a=\dfrac{F}{m}\\\\a=\dfrac{48}{8.7}\\\\a=5.51\ m/s^2

So, the acceleration of the bag of acorns is 5.51\ m/s^2.

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3 years ago
A 33.0 g iron rod, initially at 22.7 ∘c, is submerged into an unknown mass of water at 63.3 ∘c, in an insulated container. the f
professor190 [17]
When the iron and the water reach thermal equilibrium, they have same temperature, T=58.5^{\circ}C.
We can consider this as an isolated system, so the heat released by the water is equal to the heat absorbed by the iron.

The hear released by the water is:
Q_w =m_w C_{sw} \Delta T_w
where m_w is the water mass, C_{sw}=4.186 J/(g^{\circ}C) is the specific heat of the water, and \Delta T_w = 63.6^{\circ}-58.5^{\circ}=5.1^{\circ}C is the variation of temperature of the water.

Similarly, the heat absorbed by the iron is:
Q_i = m_i C_{si} \Delta T_i
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Writing Q_w=Q_i and replacing the numbers, we can solve to find mw, the mass of the water:
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3 years ago
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S_A_V [24]

1.62 m/s is the correct answer to the problem

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4 years ago
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