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The percentage change in the price index of food and beverages in the United States from July 2000 to July 2001 was 3.1%. The change in the same index from June 2001 to July 2001 was 0.3%. The index was 174.0 in July 2001, with base year 1982. Calculate what the index was in July 2000 and June 2001, with base year 1982.
Surgeons can remove brain tumors by using a cavitron ultrasonic surgical aspirator, which produces sound waves of frequency 23.7 kHz. Estimate the wavelength of these waves in air
A boy throws a rock horizontally with a velocity of 7.0 m/s from a bridge. It falls 26 m to the water below. What is the magnitude of the velocity of the rock just before it hits the water
You are visiting a pizza parlor and watch the chef make a pizza crust. He throws a spinning disk of dough in the air. Its angular velocity is 15 rad/s. What is the final rotational kinetic energy of the dough
A ray of light makes an angle of 30 degrees with the normal to a plane mirror. The mirror is turned through an angle of 10 degrees, making the incidence angle 40 degrees. Through what angle is the reflected ray turned?
A 11-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 3.6 µF, 11.1 µF, and 32.5 µF. Find the voltage across the 32.5-µF capacitor
At a particular instant a proton is traveling in the -y direction, with speed 4105 m/s. What is the magnitude of the magnetic force on the proton
A uniform string of length is 2.5 m and mass 0.01 kg is placed under a tension 10N. What is the frequency of its fundamental mode?
A model of a helicopter rotor has four blades, each of length 3.30 m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 510 rev/min. What is the linear speed of the blade tip?
A starship moving toward Earth with a speed of 0.79 c launches a shuttle craft in the forward direction. What is the speed of the shuttle relative to the starship
An electron is bound in an infinite well (a box) of width 0.1nm. If the electron is initially in then n = 8 state and falls to the n = 7 state, find the wavelenght of the emitted photon
A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. Calculate the total energy of the system
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 1.0 is sliding freely across a section of very smooth (frictionless) horizontal ice. Calculate the upward force on the puck in bot..
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