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The label on a commercially purchased radioactive sample gives its activity as 16 µCi. The half-life of the sample is 60 days. You measure the sample's activity and find it to be only 0.25 µCi. How old is the sample?
The head of a hammer with a mass of 1.5kg is allowed to fall onto a nail from a height of 0.70m, What is the maximum amount of work it could do on the nail
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.52 kg crate to the bottom of a steep ravine of height 23.9 meters. At what speed will the crewman hit the bottom of the ravine
On the floor1.5 m in front of the mirror is a small table, 0.75 mhigh. Illustrate what is the minimum height the mirror must have foryou to be able to see the top of the table in themirror?
A horizontal piston-cylinder assembly contains 0.25 kg of an ideal gas (M=28.97 kg/kmol) of constant heat capacity (Cp=1 kj/kg*k and Cv=0.72 kj/kg*k), How much heat is transferred during this process
What is sign and magnitude of charge
A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. What is the minimum length of the mirror if the person is now 3.5 m from the mirror
The diodes are oppositely oriented, so that when one diode is forward-biased, the other is back-biased. Which phrase best describes the current in the circuit.
What is the difference between an electric insulator and an electric conductor? Give examples of materials that are electric insulators
Two children are playing a game. The rst throws a basketball straight up, and the second tries to hit it with a thrown baseball. What is the angular impulse on the basketball
A 3.8 kg ball is at rest on the floor in a 1.2 m ? 1.2 m ? 1.2 m room of air at STP. Air is 80% nitrogen (N2) and 20% oxygen (O2) by volume. What is the thermal energy of the air in the room
A leaf of area 36cm2 and mass 4.8×10?4kg directly faces the Sun on a clear day. The leaf has an emissivity of 0.85 and a specific heat of 0.80 kcal/kg?K. Estimate the rate of rise of the leaf's temperature
A rifle is aimed horizontally at a target 51 {rm m} away. The bullet hits the target 1.5 {rm cm} below the aim point. What was bullet's speed as it left the barrel.
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