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A hospital patient has been given 131I (half-life = 8.04 days) which decays at 4.4 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays and is not excreted.
A force gives a 100-kg mass an acceleration of 2 m/s2. If the same force acts on a mass of 1000 kg, what acceleration does it produce
A car dealer claims that his product will accelerate at a constant rate from rest to a speed of 200 km/hr in 8s. What estimated distance will the car travel.
An electric device, which heats water by immersing a resistance wire in the water, What is the resistance of the heater wire
A small body of mass 0.13 kg is undergoing simple harmonic motion of amplitude 9.0 cm and period 0.10 s. What is the maximum value of the force acting on it? If the oscillations are produced by a spring, what is the spring constant?
An elevator moving upward approaches the top floor of a high rise building and begins to slow down at the rate of 2.00 m/s2. Calculate the apparent weight of the passenger if her mass is 60.0 kg
A 1200 N uniform boom is supported by a cable perpendicular to the boom, as in Figure P8.28. The boom is hinged at the bottom, and a 2000 N weight hangs from its top. Find out the tension in the supporting cable and the components of the reaction ..
A 0.39 T magnetic field is perpendicular to a circular loop of wire with 55 turns and a radius of 13 cm. what is the magnitude of the induced emf
Two stars are at rest 1.0×1014m apart. This is about 10 times the diameter of the solar system. What is the speed of each star at the moment of impact
An object with a charge of -2.6 \mu C and a mass of1.7×10−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to itsweight.
A solid sphere with a radius of 0.70 m can be rotated about an axis through its center by a torque of 10.5 N *m which accelerates it uniformly from rest through a total of 180 revolutions in 15.0 s
Which of these do you think would allow sound to travel fastest? Explain the answer. Give two reasons - one relating to the density of molecules and the second to the elasticity of your choice - air, water, solid wood. Confirm to specifically stat..
A model rocket fired vertically from the ground ascends with aconstant vertical acceleration of 54.8 m/s2for 1.05 s. What is themaximum altitude reached
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