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The activity of a radioisotope is found to decrease by 30% in 1 week. What are the values of its decay constant, half-life, and mean life?
A harmonic oscillator consists of a mass of 1g on a spring. It's frequency is 1Hz and the mass passes through the equilibrium position with a velocity of 10 cm/s. What is the order of magnitude of the quantum number associated with the energy of the ..
Two people start at the same place and walk around a circular lakein opposite directions. One walks with an angular speed of2.00 10-3 rad/s, while the other has an angularspeed of 3.20 10-3 rad/s. How long will it be beforethey meet?
The body contains many small currents caused by the motion of ions in the organs and cells. how large is the current in the heart
Two spaceships approach each other, each moving with the same speed as measured by an observer on the Earth. find the speed of each spaceship as measured on Earth
A 1500kg car starts from rest and drives around a flat 52-m-diameter circular track. at what time does the car begin to slide out of the circle
The sound level in decibels is typically expressed as ? = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is ? = 2..
If the first-order maximum for pure wavelength light falling on a double slit is at an angle of 10.0 degrees, What is the angle of the first minimum
A 6650kg iceberg with density 931 {\rm kg/m}^3 is afloat in seawater with density 1030 {\rm kg/m}^3, Find the volume of water displaced by the iceberg
In the nuclear-fission reaction, neutrons are emitted, usually some number of neutrons between 0 and 5. The process is thought to be random. First calculate the total number of fissions observed. Then calculate the average number of neutrons per f..
In a specific heat experiment 212.0 grams of aluminum (C=913.0 J/kg.K) at 100.0°C) is mixed with 64.0 g water at 20.0°C. Find the entropy change of the aluminum
An 8.8 mH inductor is connected to an ac generator (10.0 V rms, 600 Hz). Determine the peak value of the current supplied by the generator
a car moving initially at 50mih begins decelerating at a constant rate 100ft. short of a stoplight. a. if the car comes
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