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Radioactive isotopes often occur together in mixtures. Suppose a 290g sample contains 131Ba, with a half-life of 12 days, and 47Ca, with a half-life of 4.5 days. If there are initially twice as many calcium atoms as there are barium atoms, what will be the ratio of calcium atoms to barium atoms 2.30 weeks later?
A wheelchair athlete is training on a stationary ergometer. Her wheel's angular velocity is 3 rev/s and diameter is 80.0 cm. What is the linear velocity at the wheel's center
A $100 cart is moving down an inclined plane at 1.30 m.s, The cart collides with a stationary object and rebounds with a speed of 0.970 m/s. What was the change in momentum
After the Sun exhausts its nuclear fuel, its ultimate fate might be to collapse to a white dwarf state. In this state, it would have about the same mass as it has now, but its radius would be equal to the radius of the Earth.
The turntable in a microwave oven has a moment of inertia of 0.06 kg meters squared and is rotating once every 4.01 s. What is its kinetic energy in Joules
Two Resistors of R1 = 3.23 ohm and R2 = 5.95 ohm are connecred in series to a battery whith an EMF of 24.0 v, Find the current I1 through the first resister
A car goes 13 miles east, then due North ending up 25 deg North of East from its initial position. How far due North did it travel
6 J of work is needed to push an object of mass 2 kg from point A to point B of the frictionless inclined plane, What is the length s of the inclined plane
A 5g lead bullet travelling at 370-m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet whilst the other half is transmitted to the tree, what is the increase in t..
500 kg satellite moves in a circular orbit of 4.8 x 106 m above the surface of the earth. What is the orbital speed of the satellite
A 755 gram grinding wheel 25.5 cmin diameter is in the shape of a uniform solid disk. (We can ignore the small hole at the center.), What torque does friction exert while this wheel is slowing down
In the experiment, if the accelerating voltage is 300 V and the radius of the beam path is 3.2 cm, what is the Lorentz force on a single electron
An ideal (Carnot) freezer in a kitchen has a constant temperature of 263 K, whereas the air in the kitchen has a constant temperature of 303 K. Suppose the insulation for the freezer is not perfect and conducts energy into the freezer at a rate of 0...
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