Recent content by Cantworkit

Homework Statement A subway train rounds an unbanked curve at 67 km/h. An unused strap makes an angle of 15 degrees to the vertical. What is the radius of the turn. The book answer is 132 m. Homework Equations F = ma = mv^2/r The Attempt at a Solution A...

Homework Statement Two blocks rest on slopes and are coonected by a pulley. The left hand slope makes a 60 degree ngla with the horizontal. The right hand slope makes a 20 degree angle. How should the masses compare if the objects do not slide along the frictionless slopes? Book...

Homework Statement In throwing a 200-g ball, one's hand exerts a constant upward force of 9.4 N for 0.32 s. How high does the ball rise after leaving the hand? Book answer is 7.2 m. Homework Equations F = ma v = v0 + at y - y0 = v^2/2g The Attempt at a...

Homework Statement A 2.0-kg mass and a 3.0-kg mass are on a horizontal frictionless surface connected by a massless spring with spring constant k = 140 N/m. The large mass is on the right of the spring: the small mass on the left. A 15-N force is applied to the large mass. How much...

[SOLVED] circular and projectile motion Homework Statement In the Olympic hammer throw, contestants whirl a 7.3 kg ball on the end of a 1.2 m long wire before releasing it. Suppose the hammer is released frim a height of 1.3 m while moving in a direction 24 degrees above the...

[SOLVED] linear motion Homework Statement Skiers leave a ski jump at 28 m/s, at an angle of 9.5 degrees below the horizontal. Their landing zone is a horizontal distance of 55 m from the end of the jumo The ground is contoured at that point so that the skiers trajectories make an...

Okay, I finally got it. Thanks

I am still having trouble. If y0 is at the water, then the total y dispacement is 5.5 m--2.5 m above the board and 3 m below the board. I still can't come up with 7.2 m/s for v0 no matter how I solve for it.

I do not know the initial velocity. That is what I am trying to solve for, as wll as the angle.

Homework Statement A diver leaves a 3-m board on a trajectory that takes her 2.5 m above the board, and the into the water a horizontal distance of 2.8 m from the end of the board. At what speed and angle did she leave the board? Book answer is 7.2 m/s at 77 degrees to the horizontal...

[SOLVED] linear motion Homework Statement A car enters a turn at 85 km/h, slows to 55 km/h, and emerges 28 s later at 35 degrees to its original motion, still moving at 55 km/h. What is the magnitude an direction of the average acceleration measure with respect to the car's original...

[SOLVED] linear motion Homework Statement A bird is flying 30 m above a lake when it drops a fish. Another bird at 35 m immediatley dives and catches the fish before it hits the water. What is the initial velocity of the second bird? [b]2. Homework Equations h=h0 +...