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The number of radioactive nuclei present at the start of an experiment is 4.10 10^15. The number present 25 days later is 7.84 1014. Estimate the half-life of the nuclei?
(in days)
A person with perfect pitch sits on a bus bench listening to the 450 Hz horn of an approaching car. If the person detects the frequency of 470 Hz, how fast is the car moving.
A 10 g bullet moving 1000 m/s strikes and passes through a 2.0-kg block initially at rest, as shown. The bullet emerges from the block with a speed of 400 m/s. How much energy was lost in the collision
The clarinet is well modeled as a cylindrical pipe that is open at one end and closed at the other. Find the wavelength and frequency of the third normal mode of vibration
For an RLC circuit with a resistance of 15 Kohms , a capacitance of 9 uF and an inductance of 31 H , what frequency is needed to minimize the impedance
A light beam strikes a piece of glass at a 72.00^\circincident angle. The beam contains two wavelengths, 450.0{\rm nm}and 700.0 {\rm nm},for which the index of refraction of the glass is 1.4820 and1.4742, respectively
You are driving your car over a circular-shaped bump in the road that has a radius of curvature of 76.9 m. What is the maximum speed that you can drive the car over the top of the bump without losing contact with the road
Two concentric metal spheres are found to have a potential difference of 646.0 V when a charge of 2.816·10-8 C is applied to them. The radius of the outer sphere is 0.188 m. What is the radius of the inner sphere?
Suppose that a plane is traveling with a horizontal velocity of vx = +238 m/s at an altitude of y = 1053 m. determine the time required for the package to hit the ground
An electron is initially at rest just outside a large copper surface that has a charge density of 1.04 10-6 C/m2. How far has the electron moved in 1.12 10-9 s if the field is uniform over this region
An infinitely long line of charge has linear charge density 5.00 x10-12 C/m. A proton (mass 1.67 x10-27 kg, charge +1.60 x10-19 C) is 18 cm from the line and moving directly toward the line at 1.50 x103 m/s. How close does the proton get to the li..
the membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space.
consider a heavy crate resting on the bed of a flatbed truck. when the truck accelerates the crate also accelerates and
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