# Search results

1. ### Superposition and Interference problem

I have two questions from the Superposition unit that I don't get it. I'd really any help on these as I have my physics exam on monday! Thanks for any help! Homework Statement A steel wire is used to stretch a spring. An oscillating magnetic field drives the steel wire back and forth. A...
2. ### Elastic Collision of a gold nucleus

Homework Statement A positively charged alpha particle is fired, in a direct line, at a positively charged gold nucleus: o--> O o: alpha, O: golden nucleus. Because of their mutual repulsion, the alpha particle does not actually hit the nuleus: it comes to rest, for a...
3. ### Net Work

Homework Statement A mass of 500 g is attached to the bottom of an unstretched spring attached to the ceiling, and has a spring constant 10 N/m. The mass is then released. What is the net work done on the mass between the point where it was released and the lowest point that it reaches...
4. ### Energy Conservation.

Homework Statement A 10 kg vox slides 4.0 m down the frictionless ramp shown in the following link. It then collides with the spring whose spring constant is 250 N/m. a. What is the maximum compression of the spring? b. At what compression of the spring does the box have its maximum...
5. ### Kinematics of jet-ski - how far does Sam land?

Homework Statement Sam (5) kg takes off up a 50-m high, 10 degree frictionless slope on his jet-powered skis. The skis have a thrust of 200 N. He keeps his skis titled at 10 degrees after becoming airborne, as shown in the Figure. How far does Sam land from the base of the cliff? I drew...
6. ### What is Bob's maximum power output as he throws the rock?

Homework Statement Bob can throw a 500 g rock with a speed of 30 m/s. He moves his hand forward 1.0 m while doing so. a. How much work does Bob do on the rock? b. How much force, assumed to be constant, does Bob apply to the rock? c. What is Bob's maximum power output as he throws the rock...
7. ### Sprinter Work and Power

Homework Statement A 50 kg sprinter, starting from rest, runs 50 m in 7.0 s at constant acceleration. a. What is the magnitude of the horizontal force acting on the sprinter? b. What is the sprinter's power output at 2.0 s, 4.0 s and 6.0 s? Homework Equations xf= xo + vt+ 0.5*a*t^2...
8. ### What is the glider's velocity just after the skydiver lets go?

Homework Statement A 10-m-long glider with a mass of 680 kg (including passengers) is gliding horizontally through the air at 30 m/s when a 60 kg skydriver drops out by releasing his grip on the glider. What is the glider's velocity just after the skydiver lets go? Homework Equations...
9. ### Acceleration. Component Form.

Homework Statement A particle moves in the xy-plane with constant acceleration. The particle is located at r= (2i + 4j)m at t=0 s. At t=3 s it is at r=(8i - 2j) m and has a velocity v= ( 5i - 5j) m/s. a) What is the particle's acceleration vector a? b) What are its position, velocity and...
10. ### Friction of conveyor belt on suitcase

Homework Statement A baggage handler drops your 10 kg suitcase onto a conveyer belt running at 2 m/s. The materials are such that us= 0.5 and uk=0.3 [coefficients of static and kinetic friction]. How far is your suitcase dragged before it is riding smoothly on the belt? Homework...
11. ### Kinematics- Stopping distance

Kinematics-- Stopping distance Homework Statement The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m, including the distance traveled during the driver's reaction time of 0.50 s. What is the minimum stopping distance for the same car traveling at a speed of 40...
12. ### Bouncing Ball Position, Velocity and Acceleration Graphs.

Hi! I've attempted to draw the position, velocity and acceleration graphs for a bouncing ball. This is the link for it: http://i196.photobucket.com/albums/aa59/aliatehreem/bouncing_ball.jpg What i'm wondering is, the instant in which the ball is in contact with the ground, is the...
13. ### Fluids question!

Hi! I'm new to the forums and this is the first that I'm posting something :D! I have a quick question from my textbook that I got wrong. Can someone please help me out! Thanks in advance! Question: An ice cube is floating in a glass of water that is filled entirely to the brim. When the...