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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?
a catapult launches a rock towards a hill 500m away. the rock lands on the hill 20m above the release point of the rock. find the max height of the rock during flight
A square loop of wire consisting of a single turn is perpendicular to a uniform magnetic field. What is the flux that passes through the circular loop
A 25kg child stands on the rim of a 200 kg merry-go-round that has a radius of 3 m. what is the new angular velocity of the merry-go-round
A 0.45 V potential difference is maintained across a 1.3m length of tungsten wire that has a cross-sectional area of 0.67 mm2 and the resistivity of the tungsten is 5.6 ×10−8 · m. What is the current in the wire?
A generator is designed to produce a maximum emf of140 V while rotating with an angularspeed of 3600 rpm. how many turns of wire are needed
In a pan on a stove 125 g of water at 100 degrees Celsius is converted to steam. What s the entropy change of water the is now steam
A copper wire has a resistance of 0.500 ? at 20.0ºC , and an iron wire has a resistance of 0.525 ? at the same temperature
A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. determine how fast will the disk be turning
a parallel-plate capacitor is constructed using a dielectric material whose dielectric constant is 3.90 and whose
The graphite in a pencil has a resistivity of7.84×10−6 W×m.The graphite's diameter is 0.700 mm and its length is40.0 mm. (a) Find the resistance of this graphite "wire." (b)Find the diameter of a cylindrical copper wire of the same length(having resi..
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 51.0cm. find the magnitude of the gravitational acceleration on this planet
Go back and check your needs, goals and objectives to see if there are any obvious on the launch vehicle choice. List several launch vehicles that might be used to launch your spacecraft into your chosen orbit.
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