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Radioactice substances decay exponentially. The amount of radium present at an time t obeys the law Q(t)= Qoe^-kt, where Qo. is the initial amount present and k is a suitable positive constant. The half-life of a radioactive substance is the time required for a given amount to be reduced by one-half. Now, it is known that the half-life of radium is approximately 1600 years. Suppose initially there are 200 miligrams of pure radium. Find the amount left after t years. What is the amount left after 800 years?
Two capacitors are in a series. C1=150nF and C2=120nF. The potential difference across them is 36 volts. Find the total energy stored in the network
A nonconducting solid sphere of radius 10.1 cm has a uniform volume charge density. What is the sphere's volume charge density
The mass of the Moon is 7.18X10^22 kg and radius is 1738 km. If your mass is 90 kg, what would be your weight (gravitational force of attraction) on the Moon
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.421 m and mass 5.27 kg, what should the radius of the disk be
A cart of a mass 300 kg is pushed up a track at an angle of44 degrees from the bottom to a position that is 30m higher thanthe bottom in a time of 25 seconds. What is the velocity at the bottom
In the 1850s, Armand Fizeau and Jean-Bernard-Leon Foucault made the first measurements of the speed of light in water. calculate the wavelength of yellow green light in water
question 1part 1a knight of round table fires off a vat of burning pitch from his catapult at 15.2 ms at 34 above
The electric field midway between two equal but opposite point charges is 878N/C , and the distance between the charges is 25.0cm. What is the magnitude of the charge on each (in C)?
A water pipe having a 2.96 cm inside diameter carries water into the basement of a house at a speed of 0.804 m/s, find water pressure and speed at the second floor
suppose that before collision slider a ma200g is traveling at 3.6 ms and slider b mb210g is at rest.a what is the total
A stone is thrown horizontally from the top of a 15m building. The stone hits the ground at a point 24m from the base of the tower. Determine the speed of the stone just before it hits the ground
While in outer space, a small however powerful, spherical shaped light source is turned on with us. The light source delivers 1.00 kW/m2 at1.00 cm from its center. There is a small particle of space dust at rest, 10.0 cm away from the center of the l..
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