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A sample of radioactive isotopes contains two different nuclides, labeled A and B. Initially, the sample composition is 1:1, i.e., the same number of nuclei A as nuclei B. The half-life of A is 5 hours and, that of B, 10 hours. What is the expected ratio A/B after 20 hours?
A ball of mass 0.40 kg is fired with velocity 140 m/s into the barrel of a spring gun of mass 2.1 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
A 14.5 gram, 78.6 centimeter long steel guitar string is vibrating in its fourth harmonic. What is the tension on the steel guitar 'string'
A sphere of mass 2.8 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes an angle of 40° with vertical when at rest.
The nucleus of the hydrogen atom has a radius of about 1.1x10^-15 The electron is at a distance of about 5.29 Ã- 10-11 m from the nucleus. compute the volume of the atom
A board lies on top of 2 uniform cylinders that lie on a fixed plane inclined at an angle theta. what is the acceleration of the board
The electric field within the membrane separating the inside and outside of a biological cell is approximately 7.7MV/m, what is the potential difference across the membrane
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
At each corner of a cube of 25.41 cm on a side there is a point charge Q = 8.360e-6C. Take V to be zero at infinity, what is the potential at the center of the cube
A parallel-plate air capacitor is made by using two plates 19 cm square, spaced 3.5 mm apart. It is connected to a 3-V battery. What is the electric field between the plates
write a three to five 3-5 page paper in which you1 procedures in the physical sciences challenges in
A 100kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30 below the horizontal. The coefficient of kinetic friction is 0.20. What must be the magnitude of P, so that the net work completed by it and the kinetic..
When four people with a combined mass of 290 kg sit down in a car, they find that the car drops 0.50 cm lower on its springs. What is the frequency of the car's vibration
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