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The radioactive isotope 241Am, with a half-life of 432 years, is the active element in many smoke detectors. Assume such a detector will no longer function if the activity of the isotope it contains drops below 1/525 of its initial activity. How long will this smoke detector work?
An arrow is shot horizontally from a cliff. the cliff is 421.7 m above the ground. the arrow left the cliff with a speed of 29.8 mi/hr. How far (in meter) from the base of the cliff the arrow land
A compound microscope has a barrel whose length is 15.0 cm and an eyepiece whose focal length is 1.5 cm. What focal length must the objective have
A child's water pistol shoots water through a 1.8 mm-diameter hole. If the pistol is fired horizontally 78 cm above the ground, the squirt hits the ground 1.8 m away. What is the volume flow rate through the squirt? Ignore air resistance.
An airplane must reach a speed of 172 mi/h to take off. If the runway is 470 m long, what is the minimum value of the acceleration that would allow the airplane to take off productively.
The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -73°C to +35°C. How much does the steel (average coefficent of linear expansion 11 x 10-6 (°C)-1) pipeline expand..
An electric field of 1.44 kV/m and a magnetic field of 0.363 T act on a moving electron to produce no net force. evaluate what is the electrons speed
q1. a diffraction grating is illuminated with light if wavelength 500nm. it produces the first minimum at 45 degree.
A 46 dB sound wave strikes an eardrum whose area is 4.4 × 10-5 m2. How much energy is received by the eardrum per second
A 100g cube of ice at 273k is dropped into 1kg of water that was originally at 353k. what is the final temperature of the water after the ice has melted?
q1. the frequency of an opera singer is 450 hz. assume the speed of sound in air is 340 ms. what is the frequency heard
A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 550 kg. Find the kinetic energy stored in the flywheel
an airplane is flying with a velocity of 80.0 at an angle of 19.0 above the horizontal. when the plane is a distance
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