Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 11

**Spanish Stop-motion quote**

Hey guys, I'm making a lego stop-motion movie and I have a Mexican demolition expert character. =) I'll admit, this isn't homework and I havn't taken a Spanish class...but that's why I am asking for help. There are just two lines I'd like him to say in ...

**physics**

A ball is thrown upward off the top of a 30-meter high building. 10 meters below the top of the roof, is the top of a window, which is 2 meters high. How long (time) does it take for the ball to pass from top to bottom of the window? What I have so far is: -10 = v(initial) t -...

**Physics**

Incase you were wondering in the problem description, that "30o" was meant to be 30 degrees. I forgot to change that "o" to "degrees".

**Physics**

Two ropes exert forces holding a suspended box having a mass of 100 N at rest. If one rope is at an angle of 30o to the horizontal and exerts a force of 40 N along the rope, what is the tension on the other rope and what is the angle between the rope and the horizontal? I was ...

**physics**

A boat crosses a river, which is 60 meters wide in 15 seconds. Upon crossing, the boat, which had headed straight across the river, ended up 20 meters downstream. A). What was the speed of the boat in still water? B). At what speed does the river flow? C). At what angle should...

**physics**

A gymnast of mass 61.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. How do I calculate the tension T in the rope if the gymnast hangs motionless on the rope? Also, what if the gymnast cl...

**Physics**

An object is shot at 20m/s at an angle theta. The object lands 24m away. What is the angle? Can you check if I am doing this right? I had v(initial) = 20 m/s g = 9.8 m/s^2 x = 24m 1st I solved for time: x = v(initial) t x = v(initial) cos(theta) t 24 = 20 cos(theta) t 24 / [20...

**Physics**

For Part C, I calculated it to be 331.125N, but am still getting a wrong answer. I know you said it was over 300, is that what you got too?

**Physics**

By the way, the A = 121.0 and B = 12.5 refers to the equation F=A+Bt^2, not Part A and Part B.

**Physics**

A small 7.10kg rocket burns fuel that exerts a time-varying upward force on the rocket. This force obeys the equation F = A + Bt^2. Measurements show that at t = 0, the force is 121.0N, and at the end of the first 2.10s , it is 176.0N. Part A Find the net force on this rocket ...

**physics**

Ah, that was the problem. I only put 12 degrees, not 12.462. Thanks!

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