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Carbon-14 has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of Carbon-14 is 5730 years. If a sample of charcoal from an archeological dig yields a Carbon-14 activity of 0.15 Bq per gram of carbon, how old is the material?
You pull your 55.00 kg friend on a 5.00 kg sled across a patch of snow. You pull using a 48-N force on a rope that makes a 35 degree angle with the horizontal. If the friction force between the sled and the snow is a mere 5-N what is the normal fo..
Light of wavelength 60nm illuminates a hydrogen atom in an excited state. What energy level was the electron in initially
Three forces in the x-y plane act on a 5.80 kg mass: 15.30 N directed at 59o, 12.20 N directed at 170o, Calculate the direction of the resultant force using the same sign convention as above
Find the amplitude of oscillation of the car assuming it operates as an undamped driven harmonic oscillator. Neglect the mass of the wheels and assume that they are always in contact with the road.
After flying for 15 min in a wind blowing 42 km/h at an angle of22°south of east, What is the speed of the airplane relative to the air
A 0.55 kg air cart is attached to a spring and allowed to oscillate. You are given the displacement of the air cart from equilibrium to be x = (19.7 cm) cos[(2.64 s-1)t + ?]. Find the maximum kinetic energy of the cart
If N= 200, r = 5 cm, I = 2.5 A, B = 0.25 T Plane of coil makes an angle of 60 degree, with field line. Calculate torque that must be applied to prevent
A lovesick lad wants to throw a bag of candy and love notes into the open window of his girlfriend's bedroom 10.0 m above. At what velocity should she throw the bag
From the shape of total energy vs. time plot, what can you conclude about the conservation of mechanical energy in your mass and spring system.
The traces of the rain on the side windows of the car make an angle of 60.0 with the vertical. Find out the velocity of the rain with respect to the following reference frames.
A comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being about 0.680 AU and its greatest distance from the sun being 38.5 AU. what is its speed when it is farthest from the Sun
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80 percent of its normal value. Now what is the minimum x-ray wavel..
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