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suter [353]
3 years ago
5

A bag of firewood has a mass of 10.0 kilograms and a weight of

Physics
1 answer:
lorasvet [3.4K]3 years ago
8 0
90 kilograms hope this helps
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What is the potential energy of a 45 kg object resting on the ground?
yKpoI14uk [10]

Answer:The potential energy is zero

Explanation:

3 0
3 years ago
3. a) Your body is made up of several simple machines that help you move. Identify three
Alja [10]

Answer:

Explained below

Explanation:

1) The human arm: This is a type of simple machine called "Lever". In this type of machine, the elbow acts as the fulcrum, the palm serves as the load because that's where we place the load we want to carry. While the inner part of the arm which is the inner part of the elbow represents the effort because that is the joint we mover when making use of our arms.

2) Pulleys: An example of this in the human body is the knee cap where the direction of an applied force is changed. Thus means as it is in motion, it alters the direction for which the quadriceps tendon pulls on the tibia.

3) wheel and axle: An example of this in the human body is the lateral rotation of the shoulder joint medial. The humerus which is the bone between the shoulder and elbow will act as the axle while the rotator will be the will because when it is rotated a little bit, the humerus will move along with it.

8 0
3 years ago
Which force keeps an object moving in a circle? centripetal force fluid friction inertia momentum
Virty [35]

Answer:

Any object moving in a circle (or along a circular path) experiences a centripetal force. That is, there is some physical force pushing or pulling the object towards the center of the circle. This is the centripetal force requirement.

Explanation:

3 0
3 years ago
How much heat is needed to raise the temperature of 5g of water by 20oC?
Ratling [72]
Required Heat = Q

Q = Mass * specific heat of water * change in temp.

Q = 5g * 1g/cal*degC * 20degC

Q = 100 cal of heat is required

To convert calories to Joules,
1 cal = 4.184 Joules

100cal = 418.4 J of heat is needed
5 0
3 years ago
How do you do this question?
PIT_PIT [208]

Explanation:

Assuming a uniform mass, let's say ρ is the mass per area density.

ρ = M / (πR²)

Let's look at this as the difference of two disks, a large one and a small one.

The moment of inertia of the large disk is:

I = 1/2 MR²

The mass of the small disk is:

m = ρ πr²

m = M / (πR²) πr²

m = M (r/R)²

Using parallel axis theorem, the moment of inertia of the small disk is:

I = 1/2 mr² + md²

I = 1/2 M (r/R)² r² + M (r/R)² d²

I = 1/2 M (r²/R)² + M (rd/R)²

The total moment of inertia is:

I = 1/2 MR² − 1/2 M (r²/R)² − M (rd/R)²

8 0
3 years ago
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