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A swimmer looks upward from the bottom of a 3.5--deep swimming pool. The end of the diving board is directly above him, 2.0 above the water's surface. How far from the swimmer does the board appear to be?
Calculate the period of a ball tied to a string of length 0.3 m making 6.9 revolutions every second. Answer in units of s, Calculate the speed of the ball
What is the electric field strength a point on the axis 5.0 cm from one disk between them.
A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency.
what is its potential energy relative to the bottom of the shaft? how fast will the payload be traveling when it reaches the bottom of the shaft? convert your answer to mph for a comparison to highway speeds.
On a workday the average decibel level of a busy street is 80 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 45 every minute on a weekend, what is the decibel level of the street.
A frog in a hemispherical bowl finds that he just floats without sinking in a fluid whose density is 1.35 g/cm^3. If the bowl has a radius of 6cm and negligible mass, what is the mass of frog.
A sound is set up in a pipe closed at one end and open atthe other. According to the formula given by Dr. Willis in class,when n=3 how much of a wavelength is in the pipe?
A distant quasar is found to be moving away from the earth at 0.90 c. What is the recessional speed of the quasar as measured by astronomers in the other galaxy
An electron is confined in a harmonic potential well that has a spring constant of 1.50 N/m. What are the first three energy levels of the electron
At a time when mining asteroids has become feasible, astronauts have connected a line between their 3310-kg space tug, How much time does it take for the ship and the asteroid to meet
An electron is located on a pinpoint having a diameter of 1.90 µm. What is the minimum uncertainty in the speed of the electron
A projectile is launched above the ground with an initial speed of 50 m/s at an angle of 60 degrees above the horizontal.The range is 475 m. What is the height of the launch position?
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