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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 5.96 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect? Give your answer in mm.
An object with a mass of m = 4.9 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.265 m and mass of M = 3.00 kg. Determine the magnitude of the acceleration of the object
A combination lock has a 1.5cm -diameter knob that is part of the dial you turn to unlock the lock. What is the most torque you can exert on the knob
Assume that a spacecraft lands on an asteroid and bores a hole perpendicular to its surface, what is the circumference and radius of that asteroid
Two persons start at the same place but walk around a circular lake in opposite directions. Their angular speeds are 1.90 x 10-3 rad/s and 3.10 x 10-3 rad/s, respectively. How much time elapses before they meet
Abe and Bob are bird-watching, hoping to add a particular song bird to their "life list" of species. They agree to split up so they can cover a larger area. Bob is as far away as possible, such that he can still hear the bird. How far away is he fr..
Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and find out her altitude as she crosses the bar.
A boat heads directly across a river. Its speed relative to the water is 3 m/s. How fast is the boat going relative to the bank of the river
A bar of length 2cm slides along metal rails at a speed of 1cm/s. The bar and rails are in a magnetic field of 2T, What is the induced emf in the bar and rails
A "rocket car" is launched along a long straight track at t = 0 s. It moves with constant acceleration a1 = 1.2m/s2. At what time does the second car catch up with the first one
Illustrate what is the coefficient of static friction between the chair and the floor? What is the coefficient of kinetic friction between the chair and the floor?
A cylinder of solid material weight 10.5 kg i the air, and 9.00 kg when submerged in water and 3 kg when submerged in another liquid. determine the density of the cylinder
A satellite has a mass of 6043 kg and is in a circular orbit 4.60 × 105 m above the surface of a planet. The period of the orbit is 2.2 hours. What would be the true weight of the satellite
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