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You are dating Moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion years) and its ultimate decay product, lead.
Part A: Find the age for a rock for which you determine that 50% of the original uranium-238 remains, while the other 50% has decayed into lead. Express your answer using three significant figures.
Part B: Find the age for a rock for which you determine that 64% of the original uranium-238 remains, while the other 36% has decayed into lead. Express your answer using three significant figures.
A tungsten wire is 1.50m long and has a diameter of 1.00 mm. At 20 degrees celsius a current of 50mA flows through the wire. Determine the potential across the wire
A bowler throws a bowling ball of radius R = 11 cm along a lane. The ball (the figure) slides on the lane with initial speed vcom,0 = 7.9 m/s and initial angular speed ?0 = 0. The coefficient of kinetic friction between the ball and the lane is 0...
The .50 kg box shown below is sliding with an unknown initial velocity before it slides down the incline and then collides with a mass less spring of spring constant 4.0 N/m, what was the initial velocity of the box
Molecules act as tiny springs and have vibration energy and frequency. The frequency of CO molecule is 6.42 x 1013Hz. Calculate the spring constant using the effective mass
Describe the unique behavior of water (thermal expansion and specific heat capacity) that make it essential for life on Earth. 5-8 sentences
A trumpet player is tuning his instrument by playing an A note simultaneously with the first-chair trumpeter, who has perfect pitch. What is the two possible frequencies of the other players note
Use Ampere’s law to determine the magnetic field in a densely wound toroidal solenoid with inner radius a, outer radius b, and N total turns. The cross section of the solenoid is a rectangle of width b-a and height h.
A package containing 60.0 millicuries of 32P (half life = 14.3 days) was shipped on February 11, 2011 at 11:00 am. The package was received at 11:00 pm on February 14, 2011. What was the activity of the shipment when it was received?
Assuming that air resistance is simply a constant 95 N force on the person during the fall, evalute the person’s velocity just before hitting the net.
A 10.0g plastic ball is dropped from a height of 3.30m and is moving at 3.00m/s, How much mechanical energy was lost during the balls fall
A snow mibile is pulling a large sled across a snow-covered field. The weight of the sled is 3560 N. If the coefficient of friction of the sled is 0.12,
The membrane that surrounds a certain type of living cell has a surface area of 7.1 x 10-9 m2 and a thickness of 1.1 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.4. The potential on ..
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