Simple Machines B/Compound Machines C

[UTF-8 U+6211 U+662F]

So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)

[Unome]

Fermi! (without exponents) (Click to Show Hidden Text)

70%

[jkang]

So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)

Uhhh (Click to Show Hidden Text)

wheel and axle, 99%?

[plaid suit guy2]

Answer (Click to Show Hidden Text)

[math](10 m)(20/25*20 kg) + (15 m)(x kg) = (5 m)(15 kg) + (2.5 m)(4 kg)[/math]
[math]x=5kg[/math]
Definitely negative

Correct.

So I posted the question, then realized I would need the answers too, and then realized it was negative.

[UTF-8 U+6211 U+662F]

So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)

Uhhh (Click to Show Hidden Text)

wheel and axle, 99%?

Correct except I was asking how the motor was which is probably more in

the (Click to Show Hidden Text)

30%-40% zone

[UTF-8 U+6211 U+662F]

So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.

Untitled1.png

[jkang]

So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.

Untitled1.png

Answer (Click to Show Hidden Text)

Uh probs a wheel and axle, can't really tell cuz MS Paint is pt cringe. Assuming that x is input, the IMA is 2.5. x = 32 N, and the torque generated (assuming only by x) is 320 Nm.

[UTF-8 U+6211 U+662F]

So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.

Untitled1.png

Answer (Click to Show Hidden Text)

Uh probs a wheel and axle, can't really tell cuz MS Paint is pt cringe. Assuming that x is input, the IMA is 2.5. x = 32 N, and the torque generated (assuming only by x) is 320 Nm.

This was kind of a trick question... (Click to Show Hidden Text)

Yes, it is a wheel and axle. The IMA is equal to 10m/8cm, which is 250. Therefore, the IMA is 250. x = 0 N (the arrows are facing perpendicular directions) and therefore, the torque is 0 Nm.

Your turn!