Recent content by r26h

Instead of 12 I think I should be using 18. So, take the distance from the edge of the door to the handle (36) * F and set it equal to Mg (100N) * (.5*36) F(36in)=100N(18in) So then my answer would be 50N.

Homework Statement A 10kg door is hanging on two hinges-the top hinge is 9in from the top of the door, and the bottom hinge is 9in from the bottom of the door. The width of the door is 36in and the height is 86in. If the bolt from the bottom hinge is removed, what force would someone have to...

To find the time, next I used Vf=Vi+at 0=5.48m/s +(-2m/s)(t) -5.48m/s==2t t=2.74s Then which equation would I use to find the speed at 0.5 seconds?

Would it be 75 meters?

Ok, I see my error. What if I used Vf^2=Vi^2+2ax, rearranged to Vi=Square root of (Vf-2ax) =square root (0-2(-2)(7.5) initial velocity=square root of 30 or about 5.48 meters/second

Ok, so what if to find the time I did 7.5m/ 2s/m = 3.75 seconds. Then used that equation: 0=Initial velocity + (-2m/s)(3.75s) So the initial speed is 7.5m/s? Does that make sense?

Homework Statement A car comes to a stop in 7.5 meters while braking at a rate of 2.0m/s each second. A) What was the initial speed of the car? B) What is the speed of the car after 0.5 seconds? Homework Equations Final velocity = Initial velocity + acceleration*time The Attempt at a Solution...

Sorry, I meant 'cross the bridge'. Thank you

Homework Statement Danielle bikes at a steady rate of 4.0 m/s south along the bank of a river. Summer is rowing her kayak heading south down the river; she can row at a constant rate of 2.0 m/s in still water. There is a 5.0 meter wide bridge that spans the river and the bike trail. a) If it...