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3 years ago

What is Conservation Momentum

1 answer:

7 0

Conservation of momentum is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system.

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WHY is it so important to include units when expressing numbers?

Natasha_Volkova [10]

Answer:

Without units, the results are unclear and it is hard to keep track of what each seperate measurement entails.

5 0

3 years ago

For an individual ( not a repair station) to conduct a complete 100 hour inspection on an aircraft and approve it for return to

Oliga [24]

Answer:

For an individual ( not a repair station) to conduct a complete 100 hour inspection on an aircraft and approve it for return to service requires a mechanic certificate with and powerplant and airframe ratings

Explanation:

Because these are important certificates issued by the FAA giving the mechanic authority to inspect to inspect an aircraft and approve its return to services

8 0

3 years ago

If |v|= 11, |w|= 23, |v-w|= 30, find |v+w|

GenaCL600 [577]

Answer:

$|v+w|=20$

Explanation:

We are given that

|v|=11

|w|=23

|v-w|=30

We have to find the value of |v+w|

|a-b|^2=(a+b)\cdot (a+b)=a^2+b^2-2|a||b|cos\theta

Using the formula

$(30)^2=(11)^2+(23)^2-2(11)(23)cos\theta$

$900=121+529-506cos\theta$

$900-121-529=-506cos\theta$

$250=-506cos\theta$

$cos\theta=-\frac{250}{506}$

$|a+b|^2=|a|^2+|b|^2+2a\cdot bcos\theta$

Using the formula

$|v+w|^2=(11)^2+(23)^2+2(11)(23)\times (-\frac{250}{506})$

$|v+w|^2=400$

$|v+w|^2=(20)^2$

$|v+w|=20$

7 0

3 years ago

Please help me I will give a brainless

gulaghasi [49]

Answer:

By opening the door, Elijah is using the chemical energy, which he obtained from eating food to do work. Thus, he is converting chemical energy to mechanical energy.

Stretching the spring by opening the screen door convert the potential energy which is stored in the spring to kinetic energy.

Overall there is conversion of chemical energy to potential energy.

By letting the door go, Elijah is using chemical energy. By snapping shut, the door is converting potential energy to kinetic energy. The overall energy change is conversion of chemical energy to kinetic energy.

Explanation:

4 0

2 years ago

Warsaw, Poland, Olivia Oliver of Nova Scotia broke the world record for being the fastest spinner on ice skates. She achieved a

Mekhanik [1.2K]

Answer:

155.5 rev/min

Explanation:

First, we will calculate the initial moment of inertia I_o. We will consider the ice skater as a rod rotating around its axis. Then, we calculate the final moment of inertia I_f. In this occasion we consider the arms as a rod of length L that is horizontally positioned, L so that the length of an arm is L/2. We will call M_1 the mass that remains close to the rotation axis (90 percent) and M_2 the mass located at the arms (10 percent). Finally, we write the equation for the conservation of angular momentum and we solve for ω_f.

I_o=MR^2/2

=(45)(0.15)^2/2

=0.5 kgm^2

M_1=(0.9)(45)

=40.5 kg

M_2=(0.1)(45)

=4.5 kg

I_f=M_1*R^2/2+M_2*L^2/12

=1.1 kg m^2

I_f*ω_f=I_o*ω_o

ω_f = I_o*ω_o/ I_f

=155.5 rev/min

4 0

3 years ago