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The displacement of a wave traveling in the positive x-direction is {y},(x,,,t); =; (3.5;{rm cm}):cos(2.7x;-;124t), where x is in {rm m} and t is in {rm s}.
A skier starts from rest and slides down a 20 degree incline 750 m long. If the coefficient of friction is 0.090 on all surfaces, what distance did the skier travel from the base of the incline?
Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation?
Please identify the five major perspectives in the field of psychology and list one subfield for each
They annihilate each other, and produce two gamma rays. What is the total energy of the resulting gamma rays? The electron and the positron have identical mass, of 9.11×10-31 kg, or 0.511 MeV/
One tire is inflated to a pressure of 40 {rm psi} and goes a distance of 18.9 m; the other is at 105 {rm psi} and goes a distance of 92.6 m. Assume that the net horizontal force is due to rolling fr
A group of freshly created pions travel, each at a constant speed, an average distance of 28.0 m in the laboratory before decaying. What was the average pion speed as measured in the lab?
In a typical television or in an older computer picture tube (CRT), the electrons that strike the screen to form an image are accelerated between two charged plates that have a potential difference
An automobile with a mass of 100kg is moving north on a level straight highway with a constant velocity of 80 km/h. What is the unbalanced force acting on the automobile?
On a workday the average decibel level of a busy street is 70 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 15 every minute on a weekend, what is the deci
A person pulls a toboggan for a distance of 40.0 m along the snow with a rope directed 25 degrees above the snow. The tension in the rope is 83.0 N. A) How much work is done on the toboggan by the
A block of mass m = 2.0 kg is dropped from height h = 65 cm onto a spring of spring constant k = 1960 N/m . Find the maximum distance the spring is compressed.
That is, for each 100 elapsed seconds on her wristwatch, 101 seconds elapse on yours. (b) How many times larger is the speed you just calculated than the speed of an orbiting space shuttle, 8.00&tim
A cowboy at a dude ranch fills a horse trough that is 1.5m long, 65cm wide, and 45cm deep. He uses a 2.0cm diameter hose from which water emerges at 1.5m/s. How long does it take him to fill the tr
Suppose that you have one polarizer with its polarization direction marked. If you were given a second unmarked polarizer, explain how you could determine the polarization direction of the unmarked
How far from the center of the earth must a person be to experience acceleration due to gravity that is one half the acceleration at the surface?
When a single person shouts at a football game, the sound intensity level at the center of the field is 57 dB. When all the people shout together, the intensity level increases to 107 dB. Assume th
A ball is relased from rest at tel left side of the loop-the-loop at the height h. If the radius of the loop is R, what minimum height h allows the ball not to fall off the track at the top of the
A tube is open only at one end. A certain harmonic produced by the tube has a frequency of 470 Hz. The next higher harmonic has a frequency of 555 Hz. The speed of sound in air is 343 m/s. What is
A uniform, 8.00 , spherical shell 55.0 in diameter has four small 1.90 masses attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through t
A child slides down a slide with a 29° incline, and at the bottom her speed is precisely one-fourth what it would have been if the slide had been frictionless. Calculate the coefficient of kinet
The escape speed from the Earth is 1.12 × 104 m/s, so a gas molecule traveling away from Earth near the outer boundary of the Earth's atmosphere would, at this speed, be able to escape from th
A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.700 {rm m^{3}} and the tension in the cord is 900 {
A sample of compressed methane has a volume of 648 mL at a pressure of 503 kPa. To what pressure would the methane have to be compressed in order to have a volume of 216 mL?
Calculate the water pressure at the base of Hoover Dam. The depth of water behind the dam is 220 m. (Neglect the pressure due to atmosphere.)