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1)Suppose that you start with 2.52×1018 radioactive nuclei and 2.09 h later determine that only 8.14E17 nuclei of the substance remains. What is the half-life of this substance? 2)Consider a sample containing 3.91×1019 23892U nuclei. The half-life of 23892U is 4.47 billion years. How many of these nuclei will decay during a 1.727 s interval?
The work completed by friction on the rock when it moves from point to point at the bottom of the bowl has magnitude 0.22. Just as the rock reaches point, what is the normal force on it because of the bottom of the bowl .
when a shower is turned on in a closed bathroom the splashing of the water on the bare tub can fill the rooms air with
Ice of mass 48.0 g at -9.8° C is added to 204 g of water at 15.1° C in a 109 g glass container of specific heat 0.200cal/g-°C at an initial temperature of 25.7° C. Discover the final temperature of the system.
An iron anchor of density 7870 kg/m^3 appears 200 N lighter in water than in air. What is the volume of the anchor? How much does it weigh in air?
A spherical shell has an outside radius of 2.55 cm and an inside radius of a. The shell wall has uniform thickness, What is this maximum mass
A major leaguer hits a baseball so that it leaves the bat at a speed of 28.0 m/s and at an angle of 35.3 degrees above the horizontal. Calculate the vertical component of the baseball's velocity
A 410?? resistor and a 6.50??F capacitor are connected in parallel to an ac generator that supplies an rms voltage of 220V at an angular frequency of 360rad/s. Find the current amplitude in the capacitor
A current I flows in a semi-infinite straight wire along y = 2b, z = 0 from very large positive values of x to the point (0,2b,0), then around a semicircular wire centered upon (0,b,0) and in negative values of x in the z = 0 plane to the point (0,..
At 18°C, a rod is exactly 20 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 285°C, where the rod now measures 20.21 cm on the same ruler. What is the coefficient of linear expansion for the material of which the rod ..
q1. what is the frequency shift of a 68 police radar signal when it reflects off a car moving at 117? radar waves
Kathy tests her new sports car by racing with Stan, an experienced racer. Both start from rest, Find the distance she travels before she catches him
A person 1.6 m tall stands 4.9 m from a reflecting globe in a garden. How large is the person's image
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