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A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 2,000 counts per minute. What is the half-life of the radioisotope?
A pole vaulter vaults over the bar and falls onto thick padding. He lands with a speed of 9.8m/s; the padding then brings him to a stop in a time of 0.40s. What is the average force on his body due to the padding during that time interval?
A 120 V potential difference is applied to a space heater whoseresistance is 12 Ω when hot. (a) At what rateis electrical energy transferred to thermal energy?(b) What is the cost in cents for 6.0 h at US5.0¢/kW·h?
An interference experimental setup consists of two slits that are separated by 2 micro meter. What is the angle of diffraction for the second order dark fringe
A 3.0-m-long ladder leans against a frictionless wall. What is the minimum angle the ladder can make with the floor without slipping
In a certain region, the earth's magnetic field has a magnitude of 5.4 × 10-5 T and is directed north at an angle of 49° below the horizontal. Determine the bullet's electric charge
The height of a cliff is 65m. You stand on it and throw a stone horizontally with a speed of 25m/s. How long does the stone to strike the beach below the cliff
after boarding an airpalne you carry your 14.0 kg suitcase down the aisle to your seat a distance of 24.0 m
What is the difference between Hysteresis and Eddy current loss
A hotel elevator ascends 273 meter with a maximum speed of 3.78 m/s. Determine how long does it take to make the complete trip from bottom to top
A proton starts from rest halfway between the two plates of a vacuum-filled parallel-plate capacitor; the plates are 10cm apart. What is the change in kinetic energy of the proton as it moves from its initial position and exits the capacitor
If an ice cube melts at 0oC but water also freezes at 0oC, what is the difference between melting and freezing in terms of (a) the energy
Calculate the NPV of this investment opportunity if your cost of capital is 9.5 %. Should you make the? investment?
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