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When a pin of mass 0.140 g is dropped from a height of 0.50 m, 0.05% of its energy is converted into a sound pulse by duration of 0.1 s. For both questions below, suppose that the intensity is I=P/4pir^2. (a) Estimate the range at which the dropped pin can be heard if the minimum audible intensity is 10-11 W/m2. (b) Your result in (a) is much too large in practice because of background noise. If you suppose that the intensity should be at least 10-8 W/m2 for the sound to be heard, estimate the range at which the dropped pin can be heard.
A Volleyball is spiked so that it has an initial velocity of 15 m/s directed downward at an angle of 55 degrees below the horizontal. Find the horizontal component of the ball’s velocity when the opposing player fields the ball?
An iron casting containing a number of cavities weighs 20052.8 N in air and 16121.0 N in water. What is the total volume of all the cavities in the casting
a metal airplane flies horizontally at 200. m/s where the Earth's magnetic fiels is vertical and is 45.0uT. If the wingspan is 25.0 meters. what emf is induced across the wings
a person of mass Mp is standing in an elevator of Me suspended from the top of a building by a spring with spring constant k. what is the equilibrium constant of the spring
A beaker of water sits in the sun until it reaches an equilibrium temperature of 30°C. Find how much ice remains after the system reaches equilibrium
A cement block accidentally falls from rest from the ledge of a 82.4 -m-high building, How much time, at most, does the man have to get out of the way
What volume of space contains an energy equal. A car in stop-and-go traffic starts at rest, moves forward 12m in 8 seconds, then comes to rest again. The velocity-versus-time plot for this car is given.
an object is located 18.1 cm in front of a convex mirror the image being 14.5 cm behind the mirror. a second object
In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 × 105 J of internal energy. What is the magnitude of the heat that he has lost
a simple pendulum is swinging back and forth through a small angle its motion repeating every1.43s. how much longer
A 10000 kg empty railroad car moving at 3 m/s collides with a loaded railroad car weighing 196000 N and couples with it. What is the final velocity of the combined railroad cars
A block of ice at 0°C whose mass initially is m = 48.4 kg slides along a horizontal surface, starting at a speed vo = 4.91 m/s, Compute the mass of ice melted as a result of the friction between the block and the surface
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