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A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 9.47 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect?
Four point charges, q, are fixed to the four corners of a square that is 11.2 cm on a side. An electron is suspended above a point at which its weight is balanced by the electrostatic force due to the four point charges, at a distance of 11 nm abo..
A current of 0.300 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heart beat, how many conduction electrons pass through your heart
An aluminum rod is 23.0 cm long at 20°C and has a mass of 350 g. If 15000 J of energy is added to the rod by heat, what is the change in length of the rod
A uniform circular disk has radius 35 cm and mass 350 g and its center is at the origin. Then a circular hole of radius 8.75 cm is cut out of it. Find the moment of inertia of the modified disk about the Z-axis
A 1.07 µF capacitor is connected in series with a 1.90 µF capacitor. Find the equivalent capacitance of the two capacitors
Measurements of the radioactivity of a certain isotope tellyou that the decay rate decreases from 8355 to 3160 over a period of 4.50 What is the half-life of this isotope
An ultrasonic transducer, of the type used in medical ultrasound imaging, is a very thin disk (m=0.10g ) driven back and forth in SHM at 1.0 MHz by an electromagnetic coil, What is the maximum oscillation amplitude that won't rupture the disk
A dog running in an open field has components of velocity v_x = 3.0 m/s and v_y = -1.2 m/s at time t_1 = 11.4 s. For the time interval from t_1 = 11.4 s to t_2 = 24.7 s, What is the magnitude of the dog's velocity
If the water in the river is flowing at 3.0 m/s, explain how long does it take the boat to make a round trip consisting of a 250 m displacement downstream followed by a 250 m displacement upstream?
A non-uniform beam of length 4.41m and weight 1.02kg makes an angle of 25.2 with the horizontal. Find the vertical component of the force exerted on the beam by the pivot
Planet-X has a mass of 3.79×1024 kg and a radius of 5640 km. What is the First Cosmic Speed i.e. the speed of a satellite on a low lying circular orbit around this planet, what is the radius of the synchronous orbit of a satellite
The flywheel of a motor has a mass of 300kg and a moment of inertia of 580kg?m2. The motor develops a constant torque of 2000N?m, What is the angular acceleration of the flywheel
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