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wolverine [178]
3 years ago
12

The process by which people walk

Physics
2 answers:
ICE Princess25 [194]3 years ago
6 0

Answer:

C)relies on the conversion of chemical energy from food into mechanical energy by muscles.

Explanation:

Pachacha [2.7K]3 years ago
3 0

The answer is C. Chemical Energy

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. A certain sample of metal has a mass of 3 kg and a volume of 250 cm3. What is its density?
LekaFEV [45]

Given:

The mass of the sample is,

m=3\text{ kg}

The volume is

V=250\text{ cm}^3

To find:

The density

Explanation:

The volume is,

\begin{gathered} V=250\text{ cm}^3 \\ =250\times10^{-6}\text{ m}^3 \end{gathered}

The density is,

\begin{gathered} d=\frac{m}{V} \\ =\frac{3}{250\times10^{-6}} \\ =12000\text{ kg/m}^3 \\ =12\times10^3\text{ kg/m}^3 \end{gathered}

Hence, the density is

12\times10^3\text{ kg/m}^3

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1 year ago
Make the following conversion: 34.9 cL = _____ hL
aliina [53]
We know that: 1 L = 100 cL. Or 1 cL = 0.01 L. Then we will make the conversion: 34.9 cL = 34.9 / 100 L = 0.349 L. Also: 1 hL = 100 L. 0.349 L = 0.349 / 100 hL = 0.00349 hL. This can be also written as: 3.49 * 10^(-3) hL ( in the scientific notation ). Answer: 3.49 cL = 0.00349 <span>hL </span>
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3 years ago
The diameter of circular park is 80 m find its area​
Drupady [299]
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answer:5024
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What is domain theory? How does it explain how an electromagnet become magnetic
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A magnet has two poles that is called north and sound the only information I can give
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A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total
Lynna [10]

Explanation:

Given Data

Total mass=93.5 kg

Rock mass=0.310 kg

Initially wagon speed=0.540 m/s

rock speed=16.5 m/s

To Find

The speed of the wagon

Solution

As the wagon rolls, momentum is given as

P=mv

where

m is mass

v is speed

put the values

P=93.5kg × 0.540 m/s

P =50.49 kg×m/s

Now we have to find the momentum of rock

momentum of rock = mv

momentum of rock = (0.310kg)×(16.5 m/s)

momentum of rock =5.115 kg×m/s  

From the conservation of momentum we can find the wagons momentum So

wagon momentum=50.49 -5.115 = 45.375 kg×m/s  

Speed of wagon = wagon momentum/(total mass-rock mass)

Speed of wagon=45.375/(93.5-0.310)

Speed of wagon= 0.487 m/s

Throwing rock backward,

momentum of wagon = 50.49+5.115 = 55.605  kg×m/s

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speed of wagon = 55.605  kg×m/s/(93.5kg-0.310kg)

speed of wagon= 0.5967 m/s

7 0
3 years ago
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