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When playing a Fortissimo (very loudly) , a trumpet emits sound energy at rate of 0.738 W out of a bell(opening) of diameter 12.7 cm. a What is the sound intensity level right in front of the trumpet? B= ____________dB b If the trumpet radiates sound waves uniformly in all directions , what is the sound intensity level at a distance of 11.5m? B=____________dB
How much energy is delivered to the battery. What is the velocity v of the smaller fish before lunch.
A transformer has 100 turns in its primary windings and 500 turns in its secondary winding. calculate the secondary voltage and current
A worker pushed a 22 kg block 8.1 m along a level floor at constant speed with a force directed 39° below the horizontal. find the increase in thermal energy of the block-floor system
Seismographs measure the arrival times of earthquakes with a precision of 0.100 s.7 To get the distance between to the epicenter of the quake, they compare the arrival times of S- and P-waves, which travel at different speeds.
An object with a charge of 4.6 MicroC moves from moves from the top to the bottom of this page at a speed of 16.6 m/s. What is the direction of this magnetic field force
A person with a mass of 52 kg runs with a speed of 6.8 m/s jumps onto the outer rim of a merry-go-round. What is the mass (in kg) of the merry-go-round
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal
To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest as in the figure below. The belt is a 160-turn coil. find the magnitude of the average induced emf in the coil during that time
A 180g block hangs from a spring with spring constant 13N/m . At t=0s the block is 13cm below the equilibrium point, What is the block's oscillation frequency
Consider the RC-circuit with R = 3 k%u03A9, C = 100 %u03BCF, and E = 12 V and a switch. At t = 0 the capacitor is empty and the switch is closed to the charging begins. Calculate the time constant of the circuit
A cube of mass m is sliding without friction at speed vo. It undergoes a perfectly elastic collision with the bottom tip of a rod length d and mass M = 2m. The rod is pivoted about a frictionless axle through its center, and initiall y it hangs strai..
A 72-kg fisherman in a 133-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.2 m/s, find the velocity of the boat after the package is thrown
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