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An .8m string has a .3kg mass on the end. If the string breaks at 5000N, what's the max velocity at the top and bottom of a vertical circle?
A heat pump uses an ideal Carnot cycle to heat a house. The outside air has a temperature of 292 K, What is the coefficient of performance of this heat pump
Yellow light of vacuum wavelength 589 nm travels at 1.942 x108 m/s through quartz. Quartz is a nonmagneticdielectric. Calculate its permittivity. Find the electric field amplitude of a linearly-polarizedelectromagnetic wave of intensity 12.0 GW/m2..
An object with total mass mtotal = 16.7 kg is sitting at rest when it explodes into three pieces. Calculate the increase in kinetic energy of the pieces during the explosion
a light bulb is wired in series with a 132-o resistor and they are connected across a 120-v source. the power delivered
How much force is the air exerting on the front cover of your textbook? (Assume that the width and the length of the book are 22.9 cm and 28.8 cm, respectively
A uniform stick 1.5 m long with a totalmass of 300 g is pivoted at its center. A 3.5 g bullet is shot through the stick midway betweenthe pivot and one end (see figure). The bullet approaches at 250m/s and leaves at 160 m/s.
vector a has a magnitude of 6.00 units vector has a magnitude of 8.00 units and the dot product amiddotb has a value of
Sodium ions (Na+) move at 0.794 m/s through a bloodstream in the arm of a person standing near a large magnet. what would be the magnetic force on the arm
Sound enters the ear, travels through the auditory canal, and reaches the eardrum. What is the fundamental frequency of the canal
Your task in physics lab is to make a microscope from two lenses. One lens has a focal length of 2 cm, the other a focal length of 1 cm. What will be the magnification of your microscope
a 2kg mass ona horizontal frictionless surface is attached to the free end of an ideal spring of stiffness k=30N/m. by what distance is the spring compressed as the mass comes to rest again
A high intensity desk lamp is rated at 45 W and 12 Volts. It contains a transformer in its base that converts 120 V household voltage to the needed level. What is the current in the primary when the lamp is on
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