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A piece of charcoal used for cooking is found at the remains of anancient campsite. A 1.10 kgsample of carbon from the wood has an activity of 2.20 x 103 decays per minute. Find the age of the charcoal. [Hint: Living material has anactivity of 15.0 decays/minute per gram of carbon present.]
A pitcher pitches the ball (m = 150 g) at 40.3 m/s. The batter makes contact with the ball for 0.001 s, Find the net average force on the ball
A spring attached to the ceiling of an elevator is 10 cm long when nothing is hanging from it. It is 12 cm long when a certain mass is hanging from it and the elevator is at rest. How long will the spring be if the elevator moves downwards with a ..
A large piece of cork weighs 0.295 N in air, he spring scale reads 0.903 N. Find the density of the cork
An object of mass 6.8 Kg is attached to a spring of force constant 1830 N/m. find the maximum velocity the object has during its motion
A drag racer starts her car from rest and accelerates at 10 m/s for the entire distance of 400m. What is the speed of the race car at the end of the run
A ship sailing in the Gulf Stream is heading 25° west of north at a speed of 4.00 m/s relative to the water. What is the velocity of the Gulf Stream
the following questions ask you to solve problems involving topics weve covered this week. work each problem and post
A planet Z has a hole bored in it at its equator , and a shaft of light from it's star goes straight down that hole to the bottom, what is the circumference and radius of planet Z
Jill has just gotten out of her car in the grocery store parking lot. The parking lot is on a hill and is tilted 3 degrees. How far has the cart rolled before Jill catches it
A standing wave in a column of air with both ends open has a frequency of 440 Hz. The next higher harmonic has a frequency of 700 Hz. How long is the column of air
Write down an expression for the efficiency of the air cart bumper in terms of the initial and final kinetic energy of the cart. What defines a collision as elastic or inelastic.
A parallel-plate capacitor with plate separation d = 1.6mm is made up of two plates of area S=3.6 cm2. The charges on the facing plate surfaces have the same magnitude Q but opposite signs.
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