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A 2.0 gram sample of a radioactive isotope undergoes radioactive decay. If the half life of the isotope is 45 minutes, the amount of the isotope that remains after 5.0 hours is?
for distant stars astronomers estimate the distance by comparing the intensity of light coming from these stars with
A sports car traveling along a straight line increases its speedfrom 19.7 mi/h to 59.7 mi/h. What is the ratio of the final to the initial magnitude of its momentum?
A 97.1-kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.67 rad/s. Find the angular velocity of the platform with its load
A brass rod with a length of 20.0 cm is placed side by side with an aluminum rod with a length of 20.0 cm, What is the heat flow from the hot temperature to the cold temperature
q1. two speakers one straight behind the other are each generating a 547-hz sound wave. what is the smallest separation
q1. the potential at location a is 393 v. a positively charged particle is released there from rest and arrives at
The blades on a lawn mower require 5 revolutions to turn at a rate of 60 revs/sec. determine the angular acceleration of the blades
A simple pendulum is constructed from a mass of 2 kg and a massless string of length 3.5 m. What is the period of the pendulum
If a toaster is plugged into a source of alternating voltage with an rms value of 134 V, an rms current of 5.75 Amp occurs in the heating element. Calculate the resistance of the toaster heating element
A pump, submerged at the bottom of a well that is 35m deep, is used to pump water uphill to a house that is 50m above the top of the well, as shown above. The density of the water is 1000 kg/m3. All pressures are gauge pressures. Top of well pipe to ..
Consider the work-energy theorem relating work done on an object and its change in kinetic energy. What is the formula? Explain in your own words what this formula gives you. Create an example
A piano tuner hears one beat every 3.1 seconds when trying to adjust two strings, one of which is sounding 440 Hz, How far off in frequency is the other string
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