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The number of radioactive nuclei present at the start of an experiment is 4.20 *1015. The number present 23 days later is7.84 *1014. Evaluate the half-life of the nuclei?
(in days)
A 29 kg board 3.2 m long is supported in a horizontal position at the two ends. A 77 kg worker stands 1.4 m from one end. What forces are exerted by the board on the two support points
Racing drivers like to warm up the tyres of their car as soon as possible. One reason is that warm tyres grip the road better but the temperature also affects the pressure of the air into he tyres.
If a drop of mass 1.49061e-12 kg remains stationary in an electric field of 1.1e6 N/C, How many extra electrons are on this particular oil drop (given the presently known charge of the electron
two cars cover the same distance in a straight line. car a covers the distance at a constant velocity. car b starts
Suppose 199 W of heat flows by conduction from the blood capillaries beneath the skin to the body's surface area of 1.37 m2. estimate the average distance of capillaries below the skin surface
A very long solenoid with a circular cross section and radius r= 8.10 cm with n= 1.50E 4 turns/m has a magnetic energy density uB= 6.40 mJ/m3. What is the total energy stored in the solenoid
A simple generator is designed to operate in the outback of us. The circular loop has a radius of 5.70cm and consists of 200 windings. The armature rotates in a magnetic field of 0.42T at a rate of 3200 revolutions per minute. what is the expected ou..
A 61 kg speed skater with the velocity of 16 m/s comes into a curve of 18 m radius. How much friction should be exerted between skates and ice to negotiate the curve.
A car speeds up from 50 mph to 65 mph to pass a truck. If this requires 7 seconds, what is the average acceleration of the car
Light from an argon laser strikes a diffraction grating that has 5390 grooves per centimeter. Determine the wavelength of the laser light
Mark pushes his broken car 150m down the block to his friend's house. He has to exert a 110N force to push the car at a constant speed. How much Thermal Energy is created
Consider the series RC-circuit for which R = 45.0 k?, C = 45.0 µF, and emf = 33.0 V. find the charge on the capacitor one time constant
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