Machines B/C

Test your knowledge of various Science Olympiad events.
Locked
User avatar
Umaroth
Exalted Member
Exalted Member
Posts: 398
Joined: February 10th, 2018, 8:51 pm
Division: C
State: CA
Pronouns: He/Him/His
Has thanked: 167 times
Been thanked: 325 times

Re: Machines B/C

Post by Umaroth »

smayya337 wrote: April 25th, 2020, 7:49 pm
Umaroth wrote: April 25th, 2020, 12:47 pm 0.0407, less than 1 because it's the axle doing to driving

A door is 1.00 m wide and the handle is 0.75 m from the hinge. What is its IMA?
1.33, since it should just be 1.00/0.75 I'll post a new question tomorrow.
Actually, that's incorrect, it should be 0.75/0.50= 1.5 because the door's center of mass is in the middle, 0.50 m from the hinge.
These users thanked the author Umaroth for the post:
smayya337 (April 26th, 2020, 9:33 am)
Cal 2026
Troy SciOly 2021 Co-Captain
Proud Padre of the Evola SciOly Program 2018-now
Dank Memes Area Homeschool Juggernaut 2018-now
Sierra Vista SciOly Co-Head Coach 2020-now

Umaroth's Userpage
smayya337
Member
Member
Posts: 123
Joined: November 2nd, 2017, 5:15 pm
Division: Grad
State: VA
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 32 times
Contact:

Re: Machines B/C

Post by smayya337 »

Umaroth wrote: April 25th, 2020, 8:04 pm
smayya337 wrote: April 25th, 2020, 7:49 pm
Umaroth wrote: April 25th, 2020, 12:47 pm 0.0407, less than 1 because it's the axle doing to driving

A door is 1.00 m wide and the handle is 0.75 m from the hinge. What is its IMA?
1.33, since it should just be 1.00/0.75 I'll post a new question tomorrow.
Actually, that's incorrect, it should be 0.75/0.50= 1.5 because the door's center of mass is in the middle, 0.50 m from the hinge.
Oops, you're right! I should probably get back into practicing for Machines...
TJHSST '22 | UVA '26
smayya337's Userpage
smayya337
Member
Member
Posts: 123
Joined: November 2nd, 2017, 5:15 pm
Division: Grad
State: VA
Pronouns: He/Him/His
Has thanked: 27 times
Been thanked: 32 times
Contact:

Re: Machines B/C

Post by smayya337 »

On a certain Atwood machine, blocks A and B are on opposite ends of a rope that is connected to a fixed pulley. Assume that the masses of the rope and pulley are negligible, and that there is no friction. If block A has a mass of 6.0 kg and block B has a mass of 2.0 kg, what is the absolute value of the acceleration of block A? (I don't really care about the sign, hence the absolute value.)
TJHSST '22 | UVA '26
smayya337's Userpage
RiverWalker88
Exalted Member
Exalted Member
Posts: 163
Joined: February 24th, 2020, 7:14 pm
Division: Grad
State: NM
Pronouns: He/Him/His
Has thanked: 98 times
Been thanked: 204 times

Re: Machines B/C

Post by RiverWalker88 »

Alright, here's my attempt: The net force on block A is 39.2N (weight of A - weight of B), and divided by the mass, the acceleration is 6.5 m/s^2
New Mexico Institute of Mining and Technology '26, Physics
RiverWalker88
Exalted Member
Exalted Member
Posts: 163
Joined: February 24th, 2020, 7:14 pm
Division: Grad
State: NM
Pronouns: He/Him/His
Has thanked: 98 times
Been thanked: 204 times

Re: Machines B/C

Post by RiverWalker88 »

A 40.0cm gear drives a 20.0cm gear.
a. If the input torque is 10.0N*m, what is the output torque?
b. If the input rotational velocity is 30.0rpm, what is the output rotational velocity?
c. A 30.0cm gear is added in between these 2 gears. Now what is the output velocity if the input velocity is 30.0rpm?

Kinda simple, but I'm not super creative at the moment.
New Mexico Institute of Mining and Technology '26, Physics
User avatar
Umaroth
Exalted Member
Exalted Member
Posts: 398
Joined: February 10th, 2018, 8:51 pm
Division: C
State: CA
Pronouns: He/Him/His
Has thanked: 167 times
Been thanked: 325 times

Re: Machines B/C

Post by Umaroth »

a) still 10.0 N*m, torque stays the same, I think you meant output force b) -60.0 rpm, negative implying opposite direction c) +60.0 rpm, same direction A bird is perched on the middle of a long string. Is there any way to apply tension to the ends of the string such that the string remains completely taut? Explain.
These users thanked the author Umaroth for the post:
RiverWalker88 (April 27th, 2020, 10:12 am)
Cal 2026
Troy SciOly 2021 Co-Captain
Proud Padre of the Evola SciOly Program 2018-now
Dank Memes Area Homeschool Juggernaut 2018-now
Sierra Vista SciOly Co-Head Coach 2020-now

Umaroth's Userpage
RiverWalker88
Exalted Member
Exalted Member
Posts: 163
Joined: February 24th, 2020, 7:14 pm
Division: Grad
State: NM
Pronouns: He/Him/His
Has thanked: 98 times
Been thanked: 204 times

Re: Machines B/C

Post by RiverWalker88 »

Umaroth wrote: April 27th, 2020, 9:46 am a) still 10.0 N*m, torque stays the same, I think you meant output force b) -60.0 rpm, negative implying opposite direction c) +60.0 rpm, same direction A bird is perched on the middle of a long string. Is there any way to apply tension to the ends of the string such that the string remains completely taut? Explain.
Yeah, thanks for catching that torque error.
New Mexico Institute of Mining and Technology '26, Physics
Locked

Return to “2020 Question Marathons”

Who is online

Users browsing this forum: No registered users and 5 guests