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Dolphins and bats determine the location of their prey using echolocation.
If it takes 14ms for a bat to receive the ultrasonic sound wave reflected off a mosquito, how far is the mosquito from the bat? Take the speed of sound as 345 m/s.
A tire 2.00 ft in diameter is placed on a balancing machine,where it is spun so that its tread is moving at a constant speed of60.0 mi/h. What is the acceleration of the stone as the tire is being balanced
A ball of mass 1.7 kg hangs at the end of a string 1.2 m in length from the ceiling of a room. The height of the room is 4.0 m. What is the gravitational potential energy of the ball relative to the ceiling
A 0.958 kg block of copper initially at 30.0oC, is dropped into an insulated container with a large quantity of liquid nitrogen. What is the mass of the nitrogen that boils away
q1. a horizontal force of 10 n is applied to the outer edge of a door at an angle of 32deg to the door. the width of
The sound intensity of 1.4x10-12 J/m2s is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules if the speed of sound in the air is 331 m/s and the density of air is 1.2 kg/m3?
A 0.51 kg mass vibrates according to the equation x = 0.43 cos 8.37t, where x is in meters, and t is in seconds. (a) Determine the amplitude. m (b) Determine the frequency. Hz (c) Determine the total energy. J (d) Determine the kinetic energy and pot..
Electrons from a heated filament pass through a hole in the cathode. They are then accelerated between the cathode and anode. what direction are the electrons deflected
An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons. what is the strength of the magnetic field
Forces of 4 N and 6 N act on an object. What is the minimum value for the sum of these two forces
Mario weighs 650N and the Hour hand weighs 5000N and is uniform in density. The time is 3pm. The Hour hand is 5 meters long. What is the net Torque around the pin that attaches the hour hand to the clock face?
Two vectors, A and B are added by means of vector addition to give a resultant vector R:R=A+B. What are the maximum and minimum possible values for the magnitude of R
q1. megans mass is 30 kg. she climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 ms at the bottom of the
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