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A woman started a new job as an assistant to a jeweler. Her boss just received a very heavy necklace whose owner claims it is made of pure gold, so the boss asks the woman to determine whether the necklace owner's claims are true. The only tool the woman has at her disposal is a spring scale. Using the spring scale, she determines the weight of the necklace as 5.0 N in the air and 4.0 N in water. Knowing that the density of water is 1000 kg/m^3 she determines the density of the material of the necklace. Then she looks in her textbook to compare her answer to the density of gold which is given as 19300 kg/m^3. What did she likely tell her boss regarding if the necklace was made of pure gold? Support your answer with calculations. In all calculations take gravitational acceleration as g = 10 m/s^2.
Four charges are located in a plane as follows: q1 = -5 uC at (4,0) m; q2 = -3 uC at (4,4) m; q3 = -4 uC at (0,4) m; q4 = -2 uC at (0,0) m. Find the magnitude and direction of the resultant field at (2,2)
a man strikes one end of a thin rod with a hammer. the speed of sound in the rod is 16 times the speed of sound in air.
A 72 kg skier is going down a slope oriented 37° above the horizontal. Determine the pressure that each ski exerts on the snow
You are studying guitar strings and are able to measure a few of (but not all) the standing wave frequencies for a particular string. what is the highest possible value for the fundamental frequency
A point charge Q is located at the center of a very thin, spherical metal shell. what is the electric potential of the shell
A stone is thrown upward with an inital speed of 20 m/s. What is its acceleration at the higest point of its trajectory, Find its veolocit
the particles speed is 130 ms the magnitude of the magnetic field is 0.52 t and the radius of the path is 960 m.
A skydiver jumps out of a plane and reaches her terminal speed of120 mph after falling for 15 s. How fast will the skydiver be going28.4 s later at the moment she pullsthe ripcord? (The parachute hasn't deployed yet)
A flat coil enclosing an area of 0.10m2 is rotating at 60rev/s, whit its axis of rotationperpendicular to a 0.20-T magnetic field. what is the maximum voltage induced in the coil
A child playing tee ball hits a stationary 65 {\rm g} ball with a 300 {\rm g} bat swinging initially at 4.0 {\rm m/s}. What's the bat's post-impact speed
One of the many isotopes used in cancer treatment is gold 19879Au, with a half-life of 2.70 days. Determine the mass of this isotope
Light of a wavelength 450 nm is incident on a sodium emitter in a photoelectric effect apparatus. Sodium is 2.3 eV, What is the stopping potential for the emitted electrons
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