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A sample of a particular isotope registers 160 counts per minute. Eight hours later, the detector registers a rate of 10 counts per minute. What is the half-life of the material? How is this calculation related to carbon-14 dating?
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 29.5°, find the critical angle for the liquid when surrounded by air
Find the energy (in joules) of the photon that is emitted when the electron in a hydrogen atom undergoes a transition from the n = 5
A stone is dropped at t = 0. A second stone, with 6 times the mass of the first, is dropped from the same point at t = 56 ms. How fast is the center of mass of the two-stone system
A cannon is fired from the ground. The cannonball initially travels with a speed of 300 m/s at an angel of 25 degrees with respect to the ground, What is the cannonballs maximum height
question1a loudspeaker of mass 22.0 kg is suspended a distance of h 2.20 m below ceiling by two cables that make equal
A physics professor, equipped with a rocket backpack, steps out of a helicopter at an altitude of 617 m with zero initial velocity. (Neglect air resistance.) What is her average velocity for the entire trip
What's the definition of quantum physics, in layman's terms?
The diameters of the main rotor and tail rotor of a single-engine helicopter are 14.4 m and 2.14 m, respectively. What is the speed of the tip of the large rotor
A charge of 810 C was passed through a wire in 5.70min. What was the average electric current during that interval
Two tuning forks oscillating coherently and in phase at 12000Hz are separated by 0.35m. What is the phase angle difference between the waves
In a typical lightning flash, the potential difference between the cloud and the ground is 10^9 V and the charge transferred is 30 C. Calculate the final speed of the car
two workers push horizontally in the same direction on a 250 kg wooden crate that is on a wooden floor. What total force must they exert to start the crate moving
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