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You combine two thin lenses by placing them in contact so that their axes coincide, forming what is called a compound lens. The focal lengths of the lenses are 27.3 cm and -54.3 cm, respectively. Find the focal length of this compound lens.
An object with a mass of 500g is attached to a spring. The system is moving in simple harmonic motion with an amplitude of 0.020m, What is the frequency of the system
suppose that the cross section of the hose opening is circular with a radius of 1.5 centimeters.
On a workday the average decibel level of a busy street is 71 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 40 every minute on a weekend
q1. a school yard teeter totter with a total length of 6.0 m and a mass of 36 kg is pivoted at its center. a 19 kg
Three capacitors having capacitances of 8.3\mu F , 8.8\mu F , and 4.0\mu F are connected in series across a 38-{\rm V} potential difference. What is the total energy stored in all three capacitors
1. the peak power of a 6ft. diameter antenna is 10 watts and its duty cycle is 0.250. the wave length is 0.03mcycle.
A human eyeball is about 2.1 long, and the pupil has a maximum diameter of about 7.5 . What is the "speed" of this lens
A cube of mass m1 = 6.5 kg is sitting on top of another cube of the same size and mass m2 = 1.1 kg while they are both in free-fall
Four moles of an ideal gas undergo a reversible isothermal expansion from volume V1 to volume V2 = 5V1 at temperature T = 400K. Find the entropy change of the gas
What is the smallest thickness of a soap film (n=1.40) that would appear black if illuminated with 470nm light? Assume there is air on both sides of the soap film
A 3-kilogram block slides along on a frictionless surface at 6 m/s north and strikes an obstacle that exerts an impulse on the block of 9 N-s to the south
a student with a mass of 80.0 kg runs up three flights of stairs in 12 s. the student has gone a vertical distance of 8.0 m. what is the student's power
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