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1. A water wave passing a point causes a cork to bob up and down through a total distance of 1 m, completing one cycle every 1.5 sec. It is noted that the wave crests are 4 m apart. What is the frequency of the wave?
2. The smallest object which can be resolved with a given frequency of ultrasound in a diagnostic scaner is on the order of the wavelength of the ultrasound used. If 20 MHz ultrasound is used for a scan of the eye, and the speed of the wave is 1500 m/s, how small an object coud be detected in the eye?
If a metal wire carries a current of 23.0 mA, how long does it take for 12.0×1020 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude of the charge on an electron is 1.6 × 10-19 C.
The combined mass of the professor and the chair is 90-kg. He is pushed 2.60-m along the incline by a group of students who together exert a constant horizontal force of 600-N. The professor speed at the bottom of the ramp is 1.75m/s. use the work..
A frictionless pulley has the shape of a uniform solid disk of mass 4.00 kg and radius 28.0cm. A 3.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the stone is released from rest. As it falls down, the w..
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Presume a spherical planet P has a uniform density of 4.72 x 10^3 kg/m^3 and a radius R = 3604km. For a parcel that weighs 64N on the surface of the spherical Earth.
Two loudspeaker, 4.0 m apart and facing each other, play identical sounds of the same frequency. You stand halfway between them, where there is a max. of sound intensity. moving from this point toward one of the speakers, you encounter a min. of s..
assume you carry a bag of groceries weighing 127 N from your car to your kitchen, a distance of 57 m, without raising or lowering the bag.
An ideal spring of negligible mass is 13.00 long when nothing is attached to it. When you hang a 3.00- weight from it, you measure its length to be 14.50 .If you wanted to store 10.0 of potential energy in this spring, what would be its total leng..
A ball is thrown with an initial velocity of 14m/s. using the approximate value g=10 m/s^2, at what time does the ball reach its high point?
A jet is flying horizontally. when the plane is directly overhead at B, A person on the ground hears the sound coming from A. the average temperature of the air is 20 degrees celcius. if the speed of the plane at A is164 meters per second, what is..
A thin rod consists of two parts joined together. One-fourth of it is silver and three-fourths is gold. The temperature decreases by 21 C°.
The rock strikes the ground a horizontal distance of 44 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How long did the rock take to hit the ground? Give your answer in seconds to two d..
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