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A Geiger counter reading of a radioactive sample is initially 6920 counts per minute. The same sample gives a reading of 442 counts per minute 10.7 h later. What is the sample's half-life?
A river has a steady speed of 0.25m/s. A student swims upstream a distance of 1 km and swims back to the starting point. If the student can swim at the speed of 1.4m/s in still water.
A long solenoid that has 1,190 turns uniformly distributed over a length of 0.420 m produces a magnetic field of magnitude 1.00 multiply.gif 10-4 T at its center
A 32g bullet is fired from a rifle at 380 m/s into a water bottle at a pointblank range. The bullet travels completely through the 12 cm long bottle, find the average force exerted by the water on the bullet
The capacitance of an empty capacitor is 2.5 x 10^-6 F. The capacitor is connected to a 3 volt battery and charged up, Write the equation for q in terms of K, C(subscript zero), and V
A loaded railroad car of mass 6000 kg is rolling to the right at 2.0 m/s when it collides and couples with an empty freight car of mass 3000 kg, What is the velocity of the pair after the collision
Find out the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times.
A conical pendulum is formed by attaching a 50 g mass to a 2 m string. The mass swings around a horizontal circle of radius 1 m. What is the acceleration of the mass
What is the speed of a car going v = 1mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately. mke Use of the facts that 1 mile = 1609m and 1hour = 3600s.
A sample of paramagnetic material containing \(10^{25}\) atoms is placed in an external field magnetic field of 1 tesla at room temperature
A disk-shaped merry-go-round of radius 2.63 m and mass 155 kg rotates freely with an angular speed of 0.763 rev/s, Calculate the initial and final kinetic energies for this system.
A 100kg elevator starts from rest. It moves upward for 4s with constant acceleration until it reaches its crusing speed of 2 m/s. What is the average power of the elevator during this time interval
The electric potential inside a conducting sphere is 245V, and a distance d = 32.0cm from the surface of the sphere, the potential is 175V. Calculate (a) the radius of the sphere and (b) the charge on the sphere.
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