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Solve the each problem given below:
Problem I: A radioactive isotope has an activity of 8.44 mCi. After 4.00 hours the activity is 5.40 mCi. What is the half-life of the isotope?
Problem II: What is the activity after an additional 4.00 hours in mCi units?
Please explain the equations and steps are used to get the answer. Thanks!
a small lead ball attached to a 1.6-m rope is being whirled in a circle that lies in the vertical plane. the ball is
An electron that is moving through a uniform magnetic field has a velocity v = (30 km/s)i + 18 km/s)j when it experiences a force F = (-4.000×10-15 N)i + (6.667×10-15 N)j due to the magnetic field. If Bx = 0, calculate the magnitude of the magnetic f..
A telescope can be used to enlarge the diameter of a laser beam and limit diffraction spreading. What is the minimum angular spread of the beam
A person's face is 30cm ini front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
1. a capacitor in an rc circuit is charging. which one of the following statements is correct?a there is a magnetic
The picture below represents the crests of water wavesspreading out from a periodic disturbance in a pond. The phasedifference (in degrees) between points A and E is
a bucket filled with water has a mass if 54 kg and is hanging from a rope that is wound around a 0.050 m radius
If the shortest wavelength produced by an x-ray tube is 0.441 nm, what is the voltage applied to the tube
The phase angle of a series RL circuit with a 100 ohms resistor and a 20 mh inductor is 70 degrees. What is the inductive reactance of this circuit
What is the change in voltage a long a 2.5 m long jumper lead made from 2.0 mm diameter copper if it is carrying a current of 90 amperes? How much power is dissipated in the lead?
Why three points? Would two have been enough? Describe what changes would occur, if any, in the electric field pattern and in the equipotential curve you measured if the magnitudes of your three charges were increased, all by the same factor.
A typical nuclear reactor generates 1000 MW of electrical energy. In doing so, it produces "waste heat" at a rate of 2000 MW and this heat must be removed from the reactor. How many kilograms of cooling water have to be pumped through the reactor e..
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