In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structure and led Rutherford to propose the existence of a very dense concentration of positive charge at the center of an atom—the atomic nucleus. The alpha particle has a charge of +2e and the gold nucleus a charge of +79e. Suppose that an alpha particle is initially a great distance from the gold, has a kinetic energy of 5.87 MeV (5.87*10^6 eV), and is headed directly at a gold nucleus. How close will the particle come to the center of the nucleus? Treat the nucleus and the alpha particle as point charges.
Lab Experiment/Activity 12 Waves and Vibrations TUTORIAL http://media.pearsoncmg.com/aw/aw_hewitt_cp_10/tutorials/wavesvibrations/cpf1_wavesvibrations.html?ssocheck=done&key=245882318125518641022009&boogers=true SUBMIT ALL ANSWERS ON THE REPORT LAB ATTACHED Watch the tutorial on Waves and Vibrations at The Physics Place. (You should NOT be prompted to login. If you cannot access this site, please contact Heather Hill via email.) Crossword Puzzle (11 points) On the Homepage under Lab 12 Waves and Vibrations, you will see a link for " Lab 12 Crossword ". Complete the crossword. Check Answers. Right click on the puzzle to Select All. Once highlighted, right click on the puzzle and COPY. Paste your completed puzzle into your Report Lab 12. Ranking Tasks (9 points) Rank each sound wave by amplitude. 1) Rank the amplitudes from least to greatest. 2) How does the ear hear the differences in amplitude for a sound wave? The Doppler Effect Matching (10 points) There are eight pictures below. Each picture shows a helicopter creating a soundwave and the soundwave traveling from the helicopter to a person. In some of the pictures, the person is on the right of the cliff while in other pictuers the person is at the bottom of the ravine. In each picture, the two closest crests of the soundwave show the wavelength of sound that reached the person. Match the pictures that show the same wavelength (shortest, longest, and middle wavelength).
A geologist is using a sensor to record waves in a layer of rock and is viewing them on a monitor screen. At one moment the monitor shows the signal below. If the signal is created by just two traveling waves, what can be concluded from the signal about the waves when they reach the sensor?
. James operates an airplane that departs from JFK Airport with a constant net force of 40,000 N. The mass of James is 80 kg and the plane’s mass is 30,000 kg. What is the net force that acts on James? 2. Susan pushes her dad, David, on an ice rink with a force of 30 N. She weighs 45 kg and her dad weighs 100 kg. What are the accelerations of Susan and David? 3. Alice holds a black belt in Taekwondo and her fist has a mass of 0.5 kg. Her fist obtains a velocity of 5 m/s in 0.1 seconds from rest. Evaluate the average net force applied to the fist. 4. A lunar exploration vehicle was created by a research team. It weighs 3,000 kg on the earth. It needs an acceleration of 10 m/s2 on the moon. In order to have the same acceleration, what will be the net force acting on the vehicle on the earth? 6. You drive a 6,000 kg boat due north, while the wind exerts a force of 600 N due south and the water exerts a resistive force of 1,200 N due south. The generated force by the boat’s engines is 4,200 N. Find the magnitude and direction of the boat’s acceleration. 7. A machine accelerates a 5 kg missile from rest to a speed of 5 km/s. The net force accelerating the missile 500,000 N. How long does it take to arrive at the speed of 5 km/s? 8. Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg. What is the average net force exerted on the car and riders by the magnets? 9. Two forces of 10 N and 30 N are applied to a 10 kg box. Find (1) the box’s acceleration when both forces point due east and (2) the box’s acceleration when 10 N force points due east and 30 N force points due west. 10. When a 60 g (=0.06 kg) tennis ball is served by a newly invented machine, it accelerates from zero to 50 m/s. The ball experiences a constant acceleration due to the impact with the racket over a distance of 0.5 m. What is the net force acting on the ball? Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi and the traveled distance of an object d. 11. Cole is riding a sled with initial speed of 5 m/s from west to east. The frictional force of 50 N exists due west. The mass of the sled and Cole together is 100 kg. How far does the sled go before stopping? Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi and the traveled distance of an object d.
