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Gold, which has a mass of 19.32 g for each cubic centimeter of volume, is the most ductile metal and drawn out into a long fiber. The gold is drawn out into a cylindrical fiber of radius 2.500 µm, what is the length of the fiber?
An air conditioner draws 15 A at 220-V ac. The connecting cord is copper wire with a diameter of 1.446 mm. how much power is dissipated in the wiring
An outboard motor propels a boat through the water at 13 mi/h. How much power is produced by the motor
A spherical aluminum ball of mass 1.55 kg contains an empty spherical cavity that is concentric with the ball. The ball just barely floats in water. Calculate the outer radius of the ball
A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.4.0 min, what is the average power generated by the child
A hydrogen atom is in its first excited state n=2. Using the Bohr theor yof the atom, calculate linear momentum of the electrons
You're 6.0 m from one wall of a house. You want to toss a ball to your friend who is 6.0 m from the opposite wall. The throw and catch each occur 1.0 m above the ground
A charge of -0.50 µC is situated in an electric field of magnitude 9.0 × 104 N/C, directed horizontally to the right. Find the magnitude and direction of the force on it
An object weighs 302 N in the air. When tied to a string, connected to a balance, and immersed in water, it weighs 220 N. When it is immersed in oil, it weighs 257 N. what is the density of the object.
A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
Assume that there is a very beautiful ornate crown, supposedly made of solid gold, how would you determine its density
A certain dog whistle operates at 22.7 kHz, while another (brand X) operates at an unknown frequency. estimate the operating frequency of brand X
A figure skater is spinning at a rate of 1.8 rev/s with her arms outstretched. She then draws her arms in to her chest, What is her new rate of rotation
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