To make a little extra spending cash, Finagle J. Wurme has taken a job as a dog walker. When he meets up with his new clients, he's dismayed to learn he'll be walking three Irish Wolfhounds — Summer, Autumn, and King.

All is going well until they get to the dog park. When the three wolfhounds see all the other puppies playing, they start barking like mad and want to join in the fun. Try as he might, Finagle can't control the three dogs and soon enough, each one is tearing off in a different direction, leaving poor Finagle stuck in the middle.

King pulls his leash with a force of 220 N and Autumn pulls her leash with a force of 170 N. Imagine Finagle's feet are planted on the ground so he's stationary and the angle of Autumn's leash is not given. The angle between King's and Summer's leashes is 137°. With what force does Summer pull to counterbalance that of the other beasts?

To be eligible for a prize, send your solutions to msdeditor@penton by May 15, 2007. Please include contact info in all attachments. March's crossword puzzle, solution, and prizewinner are also posted on our site, accessible through the yellow Archive button toward the bottom of the homepage.

Win a power supply

The winner of this month's problem receives a RHINO PSP series power supply from AutomationDirect, Cumming, Ga. These provide tightly regulated output voltage for sensitive loads in industrial environments. The slim plastic case is lightweight and compact; once a fault is corrected the power supply automatically resumes supplying full-voltage power. For additional information, call (800) 633-0405 or visit automationdirect.com/powerandaccessories.

RHINO PSP power supply

• Has Power ON LED for easy visual indication of operation
• Output voltage adjustable
• Overload and short-circuit protection
• Three-year product warranty
• Power Good signal for feedback to system controller