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A sample contains 8.30×104 radioactive nuclei. In a time of 5 minutes, 2.70×103 of the nuclei decay. Evaluate the half life of the sample (in minutes).
Two very small objects, whose charges are +1.0 and -1.0 C, Find the magnitude of the attractive force that either charge exerts on the other
A step-up transformer has 300 turns on its primary coil and 90000 turns on its secondary coil if the current flowing through the secondary is 5 amps what is the current flowing in the primary.
If an automobile rounds this curve at 30 {rm m/s}, illustrate what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
a ball is thrown upward from the roof of a building, passes the roof going down three seconds later, and hits the ground one second after that. how tall is the building? how fast did the ball strike the ground?
A single strand of wire of adjustable length is wound around the circumference of a round balloon that has a diameter of 25.0 cm, what is the magnitude of the average value of the emf induced in the loop
For a real train the friction between the car and the track can be described by a friction coefficient, μ. Find out this coefficient assuming that the time it takes for the car to come to rest is 3 s.
A child and sled with a combined mass of 55.20 kg slide down a frictionless hill that is 7.84 m high at an angle of 26o from horizontal. The acceleration of gravity is 9.80 m/s2. If the sled starts from rest, what is its speed at the bottom of hil..
Suppose you're skiing up a 20m tall slope at the indicated angle of inclination. What minimum initial speed must you have at the bottom to just make it to the top
Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 2.10 x 105 m/s. What is the distance of closest approach?
A 72 kg man is riding on a 40 kg cart traveling at a speed of 2.5 m/s. What is the resulting change in the cart's speed, including sign
A positive charge moves in a region where the magnetic field is uniform, has a magnitude of 60 uT and points in the positive x direction. what is the radius of the resulting path
What will most likely cause arcing at the switch contacts.
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