2d motion Definition and 68 Threads

1. Homework Statement A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing? 3...

Homework Statement A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing? The...

Homework Statement some one walking three directions 0.35 east then 0.75 south then 2.95 33 degrees north of west. The whole trip took 2 hours. Magnitude and direction of displacement as well as the magnitude and direction of velocity. Homework Equations r (displacement vector) x (I...

Homework Statement A particle moving at a velocity of 5.2 m/s in the positive x direction is given an accelera- tion of 5.3 m/s2 in the positive y direction for 9.9 s. What is the final speed of the particle? Answer in units of m/s The Attempt at a Solution I multiplied the...

4.In the javelin throw at a track-and-field event, the javelin is launched at a speed of 30 m/s at an angle of 33° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angle to...

Homework Statement A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.40m/s at an angle of 17° below the horizontal. It stikes the ground 4.00 s later. a. How far horizontally from the base of the building does the ball strike the ground...

[SOLVED] 2D motion A shell is fired with a horizontal velocity in the positive x direction from the top of an 80 m high cliff. The shell strikes the ground 1330 m from the base of the cliff. http://courses.science.fau.edu/~rjordan/quizzes/phy2043/images/3.07.gif I think relevant...

Homework Statement A faulty model rocket moves in the xy-plane (the positive y-direction is vertically upward). The rocket's acceleration has components ax= \alphat^2 and ay=\beta-\gammat , where \alpha=2.50m/s^4, \beta=9.00m/s^2, and \gamma=1.40m/s^3. At t=0 the rocket is at the origin and...

Homework Statement A soccer player kicks a rock horizontally off a 40m high cliff. If the player hears the sound of the crash 3.00s later, what was the initial speed given to the rock? assume the speed of sound in air is 343m/s. Homework Equations Position of Y = -40m Time = 3s...

I'm almost done with my homework for the week but I'm stuck on these two questions. I've stated all the work I've done thus far below the problems. Any help would be greatly appreciated! Problem #1: A projectile is fired with an initial speed Vo at an angle theta to the horizontal...

When baseball outfielders throw the ball, they usually allow it to take one bounce on the theory that the ball arrives sooner this way. Suppose that after the bounce the ball rebounds at the same angle as it had when released (Fig. P3.70) but loses half its speed. (a) Assuming the ball is...

I'm looking for a little help on this one. I've been looking at it for hours. An airplane whose air speed is 620km/h is supposed to fly in a straight path 35.0 degrees north to east. But a steady 95 km/h wind is blowing from the north. In what direction should the plane head? I know...

I'm having a bit of trouble with this problem, I thought I knew how to solve it but can't get what is listed as the correct answer in the key. An airplane starting from airport A flies 300 km east, then 410 km at 25.5° west of north, and then 150 km north to arrive finally at airport B. The...

At t = 0, a particle moving in the xy plane with constant acceleration has a velocity of vi = (3.00 i - 2.00 j) m/s and is at the origin. At t = 2.20 s, the particle's velocity is v = (9.20 i + 6.10 j) m/s. i am asked to find the acceleration at time t. i know that the acceleration is the...

2d Motion I've been stuck with this problem for a while. Appreciate if anyone can point me in the right direction. A boy stands in a field, he throws a stone with an initial 45 degree angle. The field has a 5 degree angle downwards, so the stone touches down at -5 degree angle and 82 meters...

Find the dx for an object projected at 100 m/s from 20 degrees to 70 degrees in 5 degree intervals. How would you exactly do this? Would you use the equation Ay = A sin X?

Ok, in this problem a ball with velocity 10m/s flys off the horizontal edge of a canyon, the equation for the canyon is y^2=16x and it wants you to find the x,y cordinates where the ball hits it. I turned the balls motion into a a function of x for y and then set that equal to y=Sqrt(16x) but I...

2. [PSE6 4.P.005.] At t = 0, a particle moving in the xy plane with constant acceleration has a velocity of vi = (3.00 i - 2.00 j) m/s and is at the origin. At t = 2.80 s, the particle's velocity is v = (9.10 i + 8.50 j) m/s. (a) Find the acceleration of the particle at any time t. (Use t, i...