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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. obtain the half life in hours
In a muonic atom, the electron is replaced by a negatively charged particle called the muon. What is the shortest wavelength of the Lyman series in a muonic hydrogen atom
Describe the unique behavior of water (thermal expansion and specific heat capacity) that make it essential for life on Earth. 5-8 sentences
Light of wavelength 5.10 multiply.gif 102 nm passes through a slit of width 0.210 mm. Determine the width of the first-order bright fringe
A 102g Frisbee is 25cm in diameter and has half its mass spread uniformly in the disk and the other half concentrated in the rim. What is the Frisbee's rotational inertia
a force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 2.80 kg, and m3 = 5.30 kg. Find the magnitude of the contact force between boxes 1 and 2
A block of wood, with density 780 kg/m3 has a cubic shape with wides 0.330 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. What is the mass of the lead
If you touch the terminal of a battery, What current will pass through your body if you touch the two terminals of a 9.0 V battery with your two hands
A 190? resistor is connected to an AC source withE0 = 14V. What is the peak current through the resistor if the emf frequency is 100 Hz
What is the critical angle for light at the glass-liquid interface when the glass with n = 1.54 is immersed in water
A large arm model was constructed with a free arm which weights 1 kg, an additional weight of 1 kg is supported by the arm at a distance of 12 cm from the pivot. What is the total torque of the resis
A 56.0kg cheerleader uses an oil-filled hydraulic lift to hold four 110kg football players at a height of 1.30m. find the diameter of the football players' piston
A uniform can with mass M and height H is filled to the top with water. The initial mass of the water is 2M, What is the minimum height of the center of mass as the water drains out
A barge floating in fresh water (? = 1000 kg/m3) is shaped like a hollow rectangular prism with base area A = 650 m2, Find the mass of the coal in kilograms
A 0.900m -diameter vat of liquid is 2.60m deep. The pressure at the bottom of the vat is 1.40atm
A laser beam of power 4.40 W and diameter 2.70 mm is directed upward at one circular face of a perfectly reflecting cylinder, which is made to "hover" by the beam's radiation pressure
An artificial earth satellite has a circular orbit of radius 7.10 multiply.gif 106 m in an equatorial plane. Compute the (constant) speed of the satellite
Light inside an optical fiber tube hits the wall between the tube and air. What is the index of refraction of the tube
An extremely thin film of soapy water (n=1.36) sits on top of a flat glass plate with n=1.11. What is the thickness of the film
A pilot claims to have seen a UFO moving initially at a speed of about 374 m/s in an easterly direction and then, Compute the UFO's average acceleration during the turn
A baseball has a velocity of 41.5 m/s (92.8 mi/h), directed horizontally, as it is released by a pitcher. Calculate the ball's instantaneous acceleration just before it is released
An archer wishes to shoot an arrow at a target at eye level a distance of 49.0 m away. what angle should the arrow make with the horizontal as it is being shot
A river 107.3 m wide flows toward the south at 31.0 m/min. A girl on the west bank wishes to reach the east bank in the least possible time. How far downstream does she travel
In a certain automobile engine with an efficiency of 19.2%, combustion of gasoline in one cylinder releases 490 J of heat. Find the total mechanical power produced by all four cylinders, operating at
A convex mirror has a focal length of -20 cm. What is the position of the resulting image in cm if the image is upright and one-fourth the object size