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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!
Two objects attract each other with a gravitational force of magnitude 1.00 x 10-8 N when separated by 20.0 centimeter. Compute what is the mass of each object
A jet plane at take-off can produce sound of intensity 9.90 W/m^2 at 30.3 m away. What power of sound does the jet produce at take-off
Water is flowing through a pipe (area 3.7 cm2) that connects to a faucet adjusted to have an opening of 0.45 cm2. what is its speed as it leaves the faucet
The magnitude of a uniform electric field between the two plates is about 2 × 105 N/C. If the distance between these plates is 0.1 cm
A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 24.9 ° with respect to the horizontal. Find the magnitude of the force that the tow bar exerts on the skier
What is the maximum positive potential energy. Write down an expression for U as a function of x, with U in joules and x in meters.
A proton orbits a long, uniformly charged wire, making 1.6×10^6 revolutions per second. The radius of the orbit is 1.8 cm. What is the wire's linear charge density
A 2.20-kg block starts from rest at the top of a 30.0° incline and slides a distance of 2.10 m down the incline in 1.60 s. Find the friction force acting on the block
A 250g ice cube at -10?C is placed in an aluminum cup whose initial temperature is 70?C. The system comes to an equilibrium temperature of 20?C
An atom is cooled to zero K, and confined in a harmonic potential V (x) = 1 m?2x2. At 2t=0, the potential is switched off, such that V (x) = 0
a small weight hangs from a string attached to the rearview mirror of a car accelerating at the rate of 1.11 ms2. what
What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20^circ {rm C}? Suppose that the air bubble is always in thermal equilibrium with the surrounding water.
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