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3 years ago

When does an object possess mechanical energy?

Physics

2 answers:

Digiron [165]3 years ago

6 0

when it has the potential to move

when it is moving

for those who dont want to try and figure out what the guy above/below me gives for answers here they are

mel-nik [20]3 years ago

3 0

Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position (for example, a brick held at a vertical position above the ground or zero height position). A moving car possesses mechanical energy due to its motion (kineticenergy).

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Potassium-41 has 19 protons. How many neutrons does this isotope have ?<br>

AysviL [449]

Answer:

20 neutrons

Explanation:

This will get you the mass number of the most abundant potassium isotope. You now know that the most abundant isotope of potassium contains 20 neutrons. All isotopes of potassium will have the same number of protons inside their nucleus, i.e. 19 protons.

I hope this helps you.

3 0

3 years ago

When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modu

Anarel [89]

To solve this problem it is necessary to apply the definition of Young's Module which states that

$Y_1 = \frac{\frac{F}{A}}{\frac{\Delta l_0}{l}}$

Where,

F = Force

A = Cross sectional Area

L = Length

$L_0$ = Initial Length

We need to find the ratio between the two values when the another values are constant, that is

$\frac{Y_1}{Y_2} = \frac{\frac{\frac{F}{A}}{\frac{\Delta l_1}{l}}}{\frac{\frac{F}{A}}{\frac{\Delta l_2}{l}}}$

$\frac{Y_1}{Y_2} = \frac{\Delta l_2}{\Delta l_1}$

Re-arrange to find $\Delta l_2,$

$\Delta l_2 = \frac{9.4*10^9}{1.6*10^{10}}*3.7*10^{-5}$

$\Delta l_2 = 2.17*10^{-5} m$

Therefore the bone stretch around $2.17*10^{-5} m$

7 0

4 years ago

Based on Newton's law of action-reaction, which arrow represents the force that the seat belt would exert on the man's body if h

Alenkasestr [34]

Answer:

c. Y

Explanation:

Newton's third law of motion states that action and reaction are equal and opposite. Hence for every action, there is an equal and opposite reaction.

Considering the system of forces shown in the image, W and Y are opposite forces. When the driver slams on the brakes, he will be pushed forward towards the windscreen. The force Y exerted by the seat belt keeps him on the drivers seat by moving him backwards towards the seat.

3 0

3 years ago

What are the standard units of specific gravity?

mafiozo [28]

the answer is b.kg/L

the proper answer is 1.0 kg per litre

8 0

3 years ago

Read 2 more answers

An iron nail is made up of particles. What is true about the particles?

nordsb [41]

Answer:

All these particles behaves like small magnets which is known as domains

Explanation:

As we know that iron is a ferromagnetic substance so in this type of ferromagnetic substance all the medium particles will behave like small magnets which is known as small domains.

These domains have their own magnetic field which is very weak but if all the domains will align in same direction then all domains will combined and give strong magnetic field.

So in general case when iron nail is placed at room temperature then all these domains are randomly arranged and they do not give any net magnetic field while if we place the iron nail in external magnetic field then in that case the domains will align itself and give strong magnetic field in the direction of external field.

This is known as magnetization

8 0

4 years ago