Two identical loudspeakers are 3.2 m apart. A person stands 5 m from one speaker and 4.2 m from the other. What is the lowest frequency at which destructive interference will occur at this point? The
The sound in a classroom is 67000 times as intense as the minimum threshold of hearing. What is the intensity level of this sound in decibels? in dB
3 Cosmic Ray A cosmic-ray particle has been observed (indirectly) with an estimated energy of 16 J, or about 1020 eV. Suppose this particle was a proton (mc2 109 eV). a) What was the velocity of t
5 Traffic Ticket A physicist is arrested for running a red light. In court, he pleads that he approached the intersection at such a speed that the light looked green to him. The judge, having taken a
A physics question. Solve part B
If one sound is 24 dB greater than another sound, what is the ratio of their intensities (greater/smaller)?
By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand spherically. in dB
A spherical source radiates sound uniformly in all directions. At a distance of 13 m, the sound intensity level is 82 dB. What power is radiated by this source? in W
When playing shuffleboard, a player exerts a constant force of 2.1 N on an initially stationary puck, at an angle 55 below the horizontal. If the player pushes the puck for 1.5 m, how fast is the puc
An elevator car, with a mass of 500 kg, starts at rest and moves upward with a constant acceleration until it reaches a velocity of 1.60 m/s after 2.70 seconds. If the car rises 2.16 m during this tim
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1. Can you show me step by step how to solve this problem?:
- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas