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A source emits sound uniformly in all directions. A radialline is drawn from this source. On this line, determine the radial positions of two points, 1.28 m apart, such that the intensity level at one point is 2.46 dB greater than that at the other.
(a) What is the smaller radial position (in m)?
(b) What is the larger radial position (inm)?
A solid steel cylinder is standing (on one of its ends) vertically on the floor. The length of the cylinder is 3.5 m and its radius is 64 cm. What is the weight of the object
Three pucks have masses m1=100g, m2=125g, and m3=150g. The pucks with masses m1 and ms move with velocities v1=4.00m/s in the negative-y direction, what is the angular momentum of the system
In a specific heat experiment, 200 g of aluminium (Cp=0.215 cal/g.C) at 1000C is mixed with 50 g of water at 20C. Find the difference in entropy of the system at the end from its value before mixing? (please explain)
A cylindrical lead rod with a diameter of 2.54 cm and a length of 76.2 cm is initially at a temperature of 20.0 C. After reaching equilibrium, what is the final temperature of the rod and the mercury
You are investigating an accident where a 1500 kg car that was parked without its emergency brake on rolled down a hill with a slope of 8 degrees a distance of 150 m, How fast was the car moving when it hit the van
A 38.8-kg boy, riding a 2.27-kg skateboard at a velocity of +5.22 m/s across a level sidewalk, jumps forward to leap over a wall. What is the skateboard's velocity relative to the sidewalk
A ladder 5.6 m long leans against a wall inside a spaceship. From the point of view of a person on the ship, Find the angle the ladder makes with the floor
A carpenter uses a tape measure to measure the lenght of one side of a room. However , a large bookcase on one side of the room prevents him from measuring the full lenghth. Is this random or systematic error
You drop a 297-g silver figure of a polar bear into the 203-g aluminum cup of a well-insulated calorimeter containing 257 g of liquid water at 21.7°C. What is the final temperature of the water, cup, and bear
Element X decays to element Y with a half-life of 0.77 s. Initially there is a sample of pure X and after 2.31 s there are 7g of Y. What was the mass of the original sample
An AC power generator produces51A (rms) at 3600 V. The voltage is stepped up to 100000 V by an ideal transformer, What percentage of the power delivered by the generator
A person with perfect pitch sits on a bus bench listening to the 450 Hz horn of an approaching car. If the person detects the frequency of 470 Hz, how fast is the car moving.
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