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An ambulance is driving down a street at some unknown speed. An observer at rest hears a frequency of 520 Hz as it approaches, and then hears a frequency of 440 Hz after it has passed. What is the velocity of the ambulance, assumed constant during this time?
a single phase 60 hz source supplies a 90 kva 0.8 power factor lagging load through a transmission line with impedance
A 32 meter length of wire is stretched horizontally between two vertical posts. Obtain the magnitude of the earth magnetic field at the location of the wire, assuming the field makes an angle of 46 degree with respect to the wire
A rod has a length 2.00000 m at 10.0°C. What is the coefficient of linear expansion of the material from which the rod is made
If a curve with a radius of 60 meters is properly banked for a car traveling 60 km/hr, what must the coefficient of friction be for a car on the same curve traveling 90 km/hr.
A thin layer of oil (n = 1.25) is on top of a puddle of water (n = 1.33). If normally incident 500-nm light is strongly reflected, what is the minimum nonzero thickness of the oil layer in nanometers?
What's the charge of a glass rod after rubbing it on silk? What's the charge of silk afterrubbing with a glass rod ? What's the charge of a rubberrod after rubbing it on fur or wool? What's the charge of fur or woolafter rubbing it with a glass rod?
A bowling ball of mass 7.00kg is rolling at 3.00m/s along a level surface. Calculate the ball's rotational kinetic energy
Two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each sphere
An object falls because of gravity at a rate of -9.80 m/s2 (- sign is indicative of a downward direction) for 10.00 Seconds. If it starts from rest (vo= 0) and its position starts from do= 0.0, where is it 10.00 Seconds later.
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
As shown in the figure below, a light string that does not stretch changes from horizontal to vertical as it passes over the edge of a table. The string connects m1, a 3.60 kg block, originally at rest on the horizontal table at a height 1.30 m ab..
A car battery with 12 V and negligible internal resistance (r=0) is connected three identicle resistors with R=20. find the current and power of each resistor consumes when the switch is open
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