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a spaceship traveling at speed 5c towards earth ejects a spacepod traveling in the forward direction at speed 25c
an electric heater plugged into a 115-v ac outlet uses an average electric power of 1200 w what are the rms current and
a bat moving at 34 ms is chasing a flying insect the bat emits a 49 khz chirp and receives back an echo at 4944 khz at
a laser beam of unknown wavelength passes through a diffraction grating having 5530 after striking it perpendicularly
an electron is located on a pinpoint having a diameter of 25 um what is the minimum uncertainty in the speed of the
an unknown number of moles of an ideal monoatomic gas expand reversibly from vi 230 m3 to vf 310 m3 at a constant
an experiment requires sound intensity 155 wm2 at the distance of 361 m in any direction from a speakerwhat total sound
water flowing through a garden hose of diameter 279 cm fills a 250-l bucket in 150 mina what is the speed of the water
an engine with an output of 2470 w has an efficiency of 360 it works at 900 cycless how much work is done in each
a calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 312 m assume the density of the
a garden hose is attached to a water faucet on one end and a spray nozzle on the other end the water faucet is turned
calculate the heat flow through a 0500m long copper bar with a cross sectional area of 050 cm2 one end at 30 degrees
a balloon is filled with 475 liters of helium at a pressure of 105 atm and a temperature of 280deg ca find the mass of
a passenger car traveling down a rough road bounces up and down at 10 with a maximum vertical acceleration of 017 both
a particle with charge q is at rest when a magnetic field is suddenly turned on the field points in the z-direction
models of torpedoes are sometimes tested in a horizontal pipe of flowing water much as a wind tunnel is used to test
after our sun exhausts its nuclear fuel its ultimate fate may be to collapse to a white dwarf state in which it has
a nearsighted person cannot see objects clearly beyound 30cmthe far point if the patient has no astigmatism and contact
a copper rod of cross-sectional area 145 cm2 has one end immersed in boiling water and the other in an ice-water
a pot containing 110 liter of water initially at 19degc is placed on a 1081 w electric heating elementa how much heat
a roller-coaster car has a mass of 504 kg when fully loaded with passengers point b of the rollercoaster has a radius
the escape speed from a distant planet is 39 kms if the acceleration of gravity on the planet is 145 ms2 what is the
a roller-coaster car has a mass of 504 kg when fully loaded with passengers point a is the bottom portion of roller
a pail of water is rotated in a vertical circle of radius 145 m what is the minimum speed of the pail at the top of the
a 360 kg child swings in a swing supported by two chains each 290 m longa if the tension in each chain at the lowest