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a) In a sample of 1000 atoms, if 50 atoms decay in 5 s, what is the radioactivity, measured in mCi, of the sample?
b) In order to produce a level of radioactivity of 1mCi, how many nuclei of 99mTc (lambda=3.22x10^-5 s-1) must be present? What mass of the radionuclide does this correspond to?
c) A radioactive sample of 99mTc contains 10 mCi activity at 9 am. What is the radioactivity of the sample at 3 p.m. on the same day?
The ground distance is 8527 feet between point A whose elevation above sea level is 580 feet and point B whose elevation is 860 feet. Compute the flying height above sea level
A horse races once around a circular track in a time of 118s, with a speed of 17 m/s. What is the radius of the track? How do you go about solving this.
Early in the morning, when the temperature is 5.0° C, gasoline is pumped into a car's 41 L steel gas tank until it is full to the top. Later in the day the temperature rises to 27° C. Since the volume of gasoline increases more for a given temperatur..
A student of mass 33.5 kg wants to measure the mass of a playground merry-go-round, which consists of a solid metal disk of radius R = 1.50 m that is mounted in a horizontal position on a low-friction axle.
A step-down transformer is used for recharging the batteries of portable devices such as tape players. find the voltage supplied to a tape player from the transformer
A dentist's chair with a patient in it weighs 2000 N. The output plunger of a hydraulic system begins to lift the chair when the dentist's foot applies a force of 57 N to the input piston. Neglect any height dissimilarity between the piston and the p..
A Na+ ion moves from inside a cell, where the electric potential is -68 mV, to outside the cell, Does its energy increase or decrease
A 20.00 kg wood ball hangs from the 1.10 long wires. The maximum tension the wire can withstand without breaking is 600 N. A 0.710 kg projectile travelling horizontally hits and embeds itself in the wood ball. What is the largest speed this projectil..
A 122 m long piece of wire is connected to a 4.9 V battery. Obtain the magnitude of the current (in Amperes) flowing through the wire
A steel cable with total length 59 m and mass 110 kg is connected to two poles. The tension in the cable is 1,260 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the cable
A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup
A truck traveling at 60 mi/h brakes to a stop in 180 ft. What was the stopping time
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