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3 years ago

1. What part (or parts) of this system store potential energy?

Physics

1 answer:

choli [55]3 years ago

5 0

Answer:

➢when you crank you make kinetic energy and then the kinetic energy makes potential energy.

Explanation:

hope it will help you have a great day bye and Mark brainlist if the answer is correct

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#carry on learning

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PLS HELP!! YOU CAN SKIP THE INFO IF YOU WANT!!

kotegsom [21]

Answer:b,c,d I think

Explanation:

B because it moves sediment, or sand, to the ocean, c because it pollutes the ocean with plastic and stuff, and d because the bacteria can be harmful

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3 years ago

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A CD is spinning on a CD player. In 12 radians, the cd has reached an angular speed of 17 r a d s by accelerating with a constan

mote1985 [20]

Answer:

The initial angular speed of the CD is equal to 14.73 rad/s.

Explanation:

Given that,

Angular displacement, $\theta=12\ rad$

Final angular speed, $\omega_f=17\ rad/s$

The acceleration of the CD, $\alpha =3\ rad/s^2$

We need to find the initial angular speed of the CD. Using third equation of kinematics to find it such that,

$\omega_f^2=\omega_i^2+2\alpha \theta\\\\\omega_i^2=\omega_f^2-2\alpha \theta$

Put all the values,

$\omega_i^2=(17)^2-2\times 3\times 12\\\\\omega_i=\sqrt{217}\\\\\omega_i=14.73\ rad/s$

So, the initial angular speed of the CD is equal to 14.73 rad/s.

3 0

3 years ago

What would happen if you use a thicker wire around the iron nail of an electromagnet? (thats the whole question)

puteri [66]

Answer:

When we have a current I, we will have a magnetic field perpendicular to this current.

Then if we have a wire in a "spring" form. then we will have a magnetic field along the center of this "spring".

Now suppose we put an iron object in the middle (where the magnetic field is) then we will magnetize the iron object.

Of course, the intensity of the magnetic field is proportional to the current, given by:

B = (μ*I)/(2*π*r)

Where:

μ is a constant, I is the current and r is the distance between to the current.

Now remember that for a resistor:

R = ρ*L/A

R is the resistance, ρ is the resistivity, which depends on the material of the wire, L is the length of the wire, and A is the cross-section of the wire.

If we increase the area of the wire (if we use a thicker wire).

And the relation between resistance and current is:

I = V/R

Where V is the voltaje.

Now, if we use a thicker wire, then the cross-section area of the wire increases.

Notice in the resistance equation, that the cross-section area is on the denominator, then if we increase the area A, the resistance decreases.

And the resistance is on the denominator of the current equation, then if we decrease R, the current increases.

If the current increases, the magnetic field increases, which means that we will have a stronger electromagnet.

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3 years ago

a pitcher throws a softball toward the home plate. when the ball hits the catchers mitt its horizontal velocity is 32 meters/sec

lora16 [44]

F = (mass)(acceleration) = ma

m = 0.2 kg

Vi = 32 m/s

t = 0.5 s

Vf = 0 m/s (since it was put to stop)

a=(Vf-Vi)/t

a=(0-32)/0.5

a = 64 m/s^2 (decelerating)

F = ma = (0.2 kg)(64 m/s^2)

F = 12.8 N

Hope this answer will be a good help for you.

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3 years ago

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A car travels west for 240km in 4 hours. What is the car's velocity?

lbvjy [14]

answer as followed 240km/4h=60km/h

6 0

3 years ago