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Cobalt-60 is a beta emmiter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remian in a particular sample after 26.5 years?
A ball, released from rest, rolls down ramp A, then along the floor, then up ramp B. Rounded segments at the bottoms of the ramps allow the ball to roll smoothly from a ramp to a floor and vice vers
A 448 g mass vibrates according to the equation x = 0.38 sin (5.53t) where x is in meters and t is in seconds. (a) Determine the amplitude. (b) Determine the frequency. (c) Determine the period.
A thief plans to steal a bar of gold from a woman's purse and replace it with a bag of sand. Assume that the volumes of gold and sand are 350 mL each and the density of sand is3.00g/cm3.
Draw a picture of the arrangement and label the positions. indicate the direction of the current in each coil, so that the B-field is in the positive z-direction. Write an equation for the B-field a
A 24 cm length of 0.35 mm diameter nichrome wire is welded into a circular loop. The loop is placed between the poles of an electromagnet, and a field of 0.56 T is switched on in a time of 15 ms .
A hybird electric vechile (HEV) is a car with both a gasoline powered engine and an electric motor. Some HEV's achieve mileage ratings as high as 75 miles per gallons of gas.
Find the emf induced in the toroid when the current decreases to 0.9 A from 2.6 A in a time of 0.13 s
Suppose 1.07 g ofFeCl3 is placed in a 50.0 mL volumetric flask, water is added, the mixture is shaken to dissolve the solid, and then water is added to the calibration mark of the flask.
A 61.4-Hz generator delivers an average power of 83 W to a single light bulb. When an induced current exists in the rotating coil of a generator, a torque-called a countertorque-is exerted on the co
Consinder an experiment in which water was electrolysed. the resulting H2 and O2 are collected separately at 25oC and 1atm pressure, and the volume of O2 collected is 158.9 ml. what vol
Methanol is considered a temporary antifreeze because of its low boiling point. Calculate the amount of heat necessary to convert 1250 g of liquid at 25.0 ºC to a vapor at its boiling point.
Carbon tetrachloride, has a vapor pressure of 213 torr at 40celsius and 836 torr at 80 celsius. what is the normalboiling point of CCl4?
Given that the specific rotation of pure alpha-D-lactose is + 92.6° and that the specific rotation of pure beta-D-lactose is +34°, calculate the equilibrium percentages of the alpha and beta
The total Carbon dioxide content (HCO3 + CO2) in a blood sample is determined by acidifying the sample and measuring the volume of CO2 evolved with a Van Slyke manometric apparatuses.
The volume of sample of gas measured 25 degree C and 1.00 atmpressure is 10.0-L. what must the final temperature be in order to have a final volume 7.5 L at 1.00 atm pressure.
Magnetic resonance imaging (MRI) is a medical technique for producing pictures of the interior of the body. The patient is placed within a strong magnetic field.
The value between 2.0-L bulb, in which the gas pressure is 1.0 atm,and the 3.0-L bulb, in which the gas pressure is 1.5 atm, is opened. what is the final pressure in the two bulbs, the temperature r
Two forces act on a object: a 2000 N force directed at 30 degrees and a 3000 N force directed at 150 degrees. what is the magnitude and direction of a third force such that the net force on the obje
Gaussian function exp(-gx2), where x is the displacement from equilibrium. Confirm that this function satisfies the Schrodinger equation for a harmonic oscillator and find g.
What is the average value of the emf induced in the coil during the time it is flipping?
An analytical laboratory balance typically measures mass to the nearest 0.1 mg. What energy change would accompany the loss of 0.1mg in mass?
Experiments to study vision often need to track the movements of a subject's eye. One way of doing so is to have the subject sit in a magnetic field while wearing special contact lenses that have a
The mass of the cylinder is 12 kg, its radius is 0.10 m, and the cylinder rolls smoothly on the horizontal surface. (Let clockwise rotation be considered positive, as well as motion to the right in
Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?