(Mechanics - Easy) Two Dogs On A Diving Board

Statics 1 (2-2-2014) - Google Drive1.pdf-page-001.jpg

A dog owner has hired you to build a custom diving board for his award winning diving dogs. You've determined the diving board will weigh 150 lbs. In the most extreme loading case, the owner will have two dogs at D & E. The dog at D will weigh 43 lbs, and the dog at E will weigh 88 lbs. You want to make sure the joints are strong enough to support that loading case.

So what do you get when you calculate out the reaction forces of A and B?

A) A = 230 lbs, B = 511 lbs

B) A = -230 lbs, B = 511 lbs

C) A = 230 lbs, B = -511 lbs

D) A = -230 lbs, B = -511 lbs

The solutions to Tues & Thurs questions are free.
If you'd like full access to ALL our daily questions & solutions (Mon-Fri), sign-up for LEARNerds Premium!

(Physics - Medium) Car Rounding a Flat Curve

A car is rounding a flat curve with radius R. If the coefficient of friction between the tires and road is µs, what is the maximum speed vmax at which the driver can take the curve without sliding?

(Logic - Medium) Rope Burning Puzzle

Hey,

If you're reading this now, you're an awesome early adopter. As thanks, we're giving you FREE LIFETIME PREMIUM ACCESS to all our daily questions, solutions & features. Just register at my.learnerds.com BEFORE next week (10/20/2014).
Those who have already done so, no further action is needed.

If you create an account today, you'll never ever have to pay for LEARNerds. After this week, we'll still post questions up daily, but only the solutions for Tuesday & Thursdays questions will be free. Starting 10/20/2014, you'll have to pay for a premium account to access the solutions for the other days.

LEARNerds is a project we work on part-time in between jobs, and have supported out of our own pockets. We're hoping the premium accounts can help us continue to grow LEARNerds.

tl;dr Register before next week, and LEARNerds will be free for you, forever. Yay!

Cheers,
Jen Tran
LEARNerds Founder

You have two ropes, a lighter, and nothing else. You know that for each of the two ropes when you light one end of the rope, it will take exactly one hour to burn all the way to the other end. However, neither rope burns uniformly, and they burn at different rates from each other. For instance, half of the first rope may burn in the first 10 minutes, and then the other half would finish burning in 50 minutes, while the second rope may burn evenly throughout. Who knows? You don't!

How do you measure 45 minutes?

(Physics - Medium) Marble Run Paths - Shortest Time

Hey,

If you're reading this now, you're an awesome early adopter. As thanks, we're giving you FREE LIFETIME PREMIUM ACCESS to all our daily questions, solutions & features. Just register at my.learnerds.com BEFORE next week (10/20/2014).
Those who have already done so, no further action is needed.

If you create an account today, you'll never ever have to pay for LEARNerds. After this week, we'll still post questions up daily, but only the solutions for Tuesday & Thursdays questions will be free. Starting 10/20/2014, you'll have to pay for a premium account to access the solutions for the other days.

LEARNerds is a project we work on part-time in between jobs, and have supported out of our own pockets. We're hoping the premium accounts can help us continue to grow LEARNerds.

tl;dr Register before next week, and LEARNerds will be free for you, forever. Yay!

Cheers,
Jen Tran
LEARNerds Founder

A marble starts from rest and slides down hill. Which path results in the shortest time to the finish? 

  • 1
  • 2
  • 3
  • All take the same time to finish
  • Must be a pretty smooth hill...

(Physics - Medium) Marble Run Paths - Highest Speed

Hey,

If you're reading this now, you're an awesome early adopter. As thanks, we're giving you FREE LIFETIME PREMIUM ACCESS to all our daily questions, solutions & features. Just register at my.learnerds.com BEFORE next week (10/20/2014).
Those who have already done so, no further action is needed.

If you create an account today, you'll never ever have to pay for LEARNerds. After this week, we'll still post questions up daily, but only the solutions for Tuesday & Thursdays questions will be free. Starting 10/20/2014, you'll have to pay for a premium account to access the solutions for the other days.

LEARNerds is a project we work on part-time in between jobs, and have supported out of our own pockets. We're hoping the premium accounts can help us continue to grow LEARNerds.

tl;dr Register before next week, and LEARNerds will be free for you, forever. Yay!

Cheers,
Jen Tran
LEARNerds Founder

A marble starts from rest and slides down a hill. Which path leads to the highest speed at the finish? 

  • Path 1
  • Path 2
  • Path 3
  • All result in the same final speed
  • Balls