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A sonar device makes a soundwave in the air with a frequency of f1 = 61 Hz. What is the frequency of the sound wave created when the device is dropped into seawater (f2)? The speed of sound in air and seawater are v1 = 343 m/s and v2 = 1522 m/s, respectively.
An athlete swims the length L of a pool in a time t1 and makes the return trip to the starting poisition in a time t2. (a) If she is swimming initially in the positive x-direction, determine her average velocities symbolically in (a) the first hal..
throughout the process the mechanical device pushing the piston to compress gas is found to expend 4 kJ of energy. What is the magnitude of the heat flow between heat reservoir and the gas and in what direction does the heat flow occur.
On a banked race track, the smallest circular path on which cars can move has a radius of 111 m, while the largest has a radius 153 m, Find the smallest speed at which cars can move on this track without relying on friction
Vital Signs of Planet Earth
The pulley system is used to lift a 52 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to crate. assume the masses of the chains, pulleys, and ropes are negligible, conclude the forc..
A 76 kg sprinter starts a race with an acceleration of 5.8 m/s2, What is the magnitude of the net external force on him in N
A sinusoidal voltage ?v = (100 V) sin (200t) is applied to a series RLC circuit with L = 40 mH, C = 120 ?F, and R = 32 ?. What is the maximum current in the circuit
What is the partial pressure of oxygen in humidified air (RH= 100%) at body temp, if the barometric pressure is 750 torr
A football is kicked with a speed of 20m/s at an angle of 40 degrees to the horizontal, how long is the football in the air
One object is at rest, and another is moving. The two collide in a one-dimensional, completely inelastic collision. Determine the final speed of the two-object system
A microscope with an eyepiece lens of focal length 1.90 cm and an objective lens of focal length 1.15 cm is used to examine a section of the brain of a sacrificed rat. The distance between the lenses of the instrument is 24.0 cm and final image is vi..
A 9.59-g bullet, moving horizontally with an initial speed v0, embeds itself in a 1.45-kg pendulum bob that is initially at rest. Find the initial speed of the bullet.
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