Recent content by optoracko

The x direction is parallel to the slope. X basically the x direction (the slope, back and forth). Don't know why I said prime now, lol.

Homework Statement A boy drags his sled of 90.0N at a constant speed up a 18 degree hill. He pulls with a 40.0N force on a rope which is 35 degrees above the horizontal. a) What is coefficient of kinetic friction between the sled and the snow? Homework Equations Coefficieint = Force...

Yeah, makes sense now. Thanks!

Not quite sure. I guess I thought that if it was moving relative, it would mean that it moves that speed and the speed of the elevator. Blech. Would that mean that anything with relative motion requires something to be stationary, such as in this question?

Homework Statement An escalator is 20.0m long. If a person stands on the escalator, it takes 50.0s to ride from bottom to the top. a) if a person walks up the moving escalator with a speed of 0.500 m/s relative to the escalator how long does it take for the person to get to the top...

But since the bolt is on the train, then why are the magnitudes for both answers not the same?

If this because of the use of the phrase with respect to? Because the bolt in the first situation is relative to the train, the acceleration of the train must be taken in consideration, but with a bystander at a train station, since the train has no acceleration, it does not need to be...

It would be the resultant vectors of the acceleration sideways and up and down? The x vector would be 2.5 m/s^2 [Back] and 9.8 m/s^2 [down]. The resultant would be 10.1 m/s^2.

There would be no forces acting on it, except maybe air resistance. But still, that would mean that wrt to the train station, it is 9.8 down? How does velocity and acceleration differ when talking about relative motion?

That sounds right to me as well...still relative motion has to take into account both things' motion, and the bolt would be in free fall after the initial fall. I'm clueless.

Homework Statement A bolt drops from the ceiling of a traincar which is acceleration northward at a rate of 2.5 m/s2. What is the acceleration of the bolt with respect a stationary train station. Homework Equations Seems more qualitative to me, but d = V1t + (1/2)at2 could be...

Homework Statement A rocket is launched at an angle of 53 above the horizontal with an initial speed of 75 m/s. It moves for 25s along it's initial line of motion with an overall acceleration of 25 m/22. At this time its engines fail and the rocket proceeds to move as a freebody. a) What...

Homework Statement A mountain climber stands at the top of a 50.0m cliff hanging over a calm pool of water. The climber throws two stones vertically 1.0 s apart and observes that they cause a single splash when they hit the water. The first stone has an initial velocity of + 2.0 m/s. a) How...

Homework Statement How would a physics exper respond to the following suggestions made by three airline executives? Executive A: Since the Earth rotates from west to east, we could operate static flights - helicopters that begin by hovering above new York City could begin their landing four...

Homework Statement David is driving a steady 30.0 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.0 m/s^2 at the instant when David passes. a. How far does Tina drive before passing David? b. What is her speed as she passes him? Velocity...