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The radioactive isotope has a half-life of 2.60 y and has a half-life of 87.0 days . They each emit positive β- particles or positrons. A sample of each is prepares on June 1 and when placed on the window of a Geiger counter the gives 5000 counts per second and the 20000 counts per second. when will the two samples have the same activity , and what will the count rate be at that time?
The potential difference between the plates of a capacitor is 145 V. Midway between the plates; a proton and an electron are released. The electron is released from rest.
What is the resultant velocity of the lightning bug. find the force provided by the cable.
q1. a box of books weighing 352 n moves with a constant velocity across the floor when it is pushed with a force of 448
Jill jumps off the diving board with a velocity of 1.7 m/s at 38 degrees above horizontal. if the water surface is 2 meters below the board: A. how long will it take for her to hit the water? B. where will she hit the water? C. with what velocity ..
how much work is done by the electric field as a third charge q3 = +2.19 nC is moved from point a to point b. (q1 = +9.41 nC, q2 = -9.41 nC)
David is driving a steady 21 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.20 m/s^2 at the instant as David passes.
A voltage of 14 V is placed on a capacitor with C = 103 pF (picofarads). How much energy is stored in the capacitor
A 5.1 kg bucket of water is raised from a well by a rope. find the force exerted by the rope on the bucket.
In a ballistics test, a 25.00 g bullet travelling horizontally at 1300m/s goes through a 20.00 cm thick 450 kg stationary target and emerges with a speed of 800m/s. The target is free to slide on a smooth horizontal surface. How long is the bullet..
What is the capacitance of this capacitor. Estimate the terminal speed of a wooden sphere (density 0.810 g/cm3) falling through air, if its radius is 8.00 cm and its drag coefficient is 0.5.
an airplane travels 85 km,62degrees north of east. Its displacement is represented by the vector A in the drawing
One mole of a monatomic gass initially at 273 K and 1 atm is compressed isothermally (T constant) from volume 22.4 L to 11. 4 L, Find the final pressure and draw a PV diagram, Labeling the initial and final states 1 and 2
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