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What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 1.80 times that of
A hard rubber ball is dropped from rest, it falls to the floor and bounces back up to almost its original point. A motion detector is mounted on the ceiling directly above the ball, facing down.
At a certain initial position, the sphere's total kinetic energy is 80 J. (a) How much of this initial kinetic energy is rotational?
Determine the magnitude of the (a) electric and (b) magnetic forces exerted on the charge. If the charge is moving at a speed of 3.7 x 104 m/s perpendicular to the magnetic field of the electromagnet
A 15.4 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.44 T pointing up. During the course of 0.16 s, the field is changed to one of 0.31 T po
A ball, released from rest, rolls down ramp A, then along the floor, then up ramp B. Rounded segments at the bottoms of the ramps allow the ball to roll smoothly from a ramp to a floor and vice vers
A 448 g mass vibrates according to the equation x = 0.38 sin (5.53t) where x is in meters and t is in seconds. (a) Determine the amplitude. (b) Determine the frequency. (c) Determine the period.
Draw a picture of the arrangement and label the positions. indicate the direction of the current in each coil, so that the B-field is in the positive z-direction. Write an equation for the B-field a
A 24 cm length of 0.35 mm diameter nichrome wire is welded into a circular loop. The loop is placed between the poles of an electromagnet, and a field of 0.56 T is switched on in a time of 15 ms .
Find the emf induced in the toroid when the current decreases to 0.9 A from 2.6 A in a time of 0.13 s
A 61.4-Hz generator delivers an average power of 83 W to a single light bulb. When an induced current exists in the rotating coil of a generator, a torque-called a countertorque-is exerted on the co
Magnetic resonance imaging (MRI) is a medical technique for producing pictures of the interior of the body. The patient is placed within a strong magnetic field.
Two forces act on a object: a 2000 N force directed at 30 degrees and a 3000 N force directed at 150 degrees. what is the magnitude and direction of a third force such that the net force on the obje
What is the average value of the emf induced in the coil during the time it is flipping?
Experiments to study vision often need to track the movements of a subject's eye. One way of doing so is to have the subject sit in a magnetic field while wearing special contact lenses that have a
The mass of the cylinder is 12 kg, its radius is 0.10 m, and the cylinder rolls smoothly on the horizontal surface. (Let clockwise rotation be considered positive, as well as motion to the right in
An Airbus A320 jetliner has a takeoff mass of 75000 kg . It reaches its takeoff speed of 82m/s in 35 seconds. What is the thrust of the engines?
The voltage across which circuit element (resistor, capacitor or inductor) increases as the frequency is increased? Sketch the expected curve of V vs. f for this element.
The incresase in the length of the rod is measured by a mocrometer screw arrangement to be 1.19mm. What is the linear thermal coefficient of expansion a for the rod? Show your work.
A uniform magnetic field of magnitude 0.70 T is directed perpendicular to the plane of a rectangular loop having dimensions 7.7 cm by 13 cm. Find the magnetic flux through the loop.
Iron rails are used to build a railroad track. If each rail is 10.000m long when it is placed in the track at a temperature of 20.0 C, how much space must be left between the rails so that they just
Assuming ideal efficiency, in that we can ignore friction in moving parts, inefficient heat transfer, etc., find the: (a) height to which one day's worth of coal must be piled in a square room 10m on
If you also want 15kW of heat in your home, how much power does the heat pump require to make this happen? (The answer is less than 15)
A boat takes 4.0 hr to travel 36 km down a river, then 6.0 hr to return. How fast is the river flowing?
You have a new job designing rides for an amusement park. In one wide, the rider's chair is attached by a 9.0-m-long chain to the top of a tall rotation tower.