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A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
the plank cde has a weight of 30 lb and rests on a small pivot at d. the ll5-lb gymnast a is standing on the plank at c
A crane lifts a steel sub (dens. 7.8 x 10^3 ) of mass 20,000 kg. What is the tension in the lifting cable
An air-track glider attached to a spring oscillates with a period of 1.50s . At t=0s the glider is 4.50cm left of the equilibrium position, obtain the phase constant
Suppose an electron is accelerated from rest through a difference in potential of V = 4.6 V. Find the speed of the electron after the collision
The diameter of a specific copper wire is 8.364 mm, Find the resistance of a 1.2 km length of such wire used for power transmission..
Calculate the position inthe x-y plane where the net electric field is zero due to these twocharges. Calculate the magnitudeand direction of the force on a + 2.0 µC charge placed atthis point.
A thin copper plate of mass m has a shape of a square with a side b and thickness d. The plate is suspended on a vertical spring with a force constant k in a uniform horizontal magnetic field B parallel to the plane of the plate. Find the period of t..
Both spacecraft are initially at rest. Explain how far does the starship move as it pulls the shuttlecraft aboard?
Beginning with expressions for the reactance of a capacitor and an inductor, derive an expression for the resonant frequency
How much current is contained within the width of a thin ring concentric with the wire if the ring has the radial width of 12.0 µm and is at a radial distance of 1.2 mm.
A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bottom of its path it is moving at a speed v = 2.4 m/s and the tension in the rope is T = 14.9 N. How long is the rope
The rms speed of the molecules in 1.1 of hydrogen gas is 1700 .500J of work are done to compress the gas while, in the same process, 1800 of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecule..
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