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The 19F(3He,3H)19Ne reaction has been used to study the levels in 19Ne that are important for astrophysical processes. Suppose that the 3He beam with energy of 24 MeV (in Lab frame) is bombarded on a 19F target with thickness of 1019 atoms/cm2. The beam current is 10 nA for the 3He beam (charge state 2+). The reaction product 3H particles with kinetic energy of 20.7 MeV (in Lab frame) are detected at a polar angle of 5 degrees (in Lab frame) by a detector that covers solid angles of 0.005 sr. A count rate of 10 per second is observed for the 3H particles. (a) What is the threshold energy for this reaction to occur? (b) What is its di?erential cross section measured at 5 degrees? (c) What is the corresponding center of mass angle for the 5 degree Lab angle?
The 2000 kg cable car descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1800 kg counterweight up the other side of the hill. find the runaway car's speed at the bottom of the hill
q1. a school bus takes 0.89 h to reach the school from your house. if an average velocity of the bus is 21.1 kmh to the
The concrete wall of a building is 0.10m thick. The temperature inside the building is 20.0 °C, while the temperature outside is 0°C. Heat is conducted through the wall.
A 2.3 L volume of ideal neon gas (monatomic) is at a pressure of 5.7 atmospheres and a temperature of 390 K. find The number of neon atoms in the gas
a person whose weight is W = 658 N doing push-ups. Find the normal force exerted by the floor on each hand
question1a small object with a mass of 420 mg carries a charge of 40.0 nc and is pending by a thread between the
In a television, electrons shoot down the picture tube and strike fluorescent material on the screen, causing light to be emitted and producing the picture. assume that a certain set, the electrons are accelerated from rest 2.0 x 10^8 ms-1 in abou..
The area of a typical eardrum is about 5.00 10-5 m2. Calculate the average sound power incident on an eardrum at the threshold of pain
A fortune teller's "crystal ball" (actually just glass) is 13 cm in diameter. An image of the ring appears on the opposite side of the crystal ball. How far is the image from the center of the ball
suposse that a ferrari and a porsche begin a race with a moving start and each moves with constant speed. one lap of
Two workers are moving a slab of ice (m = 410 kg) across the factory floor. As seen from above, one worker exerts a force of 255 N at an angle of -50o, At what angle does the ice slab accelerate
Suppose you have a tube 1.20 m long, open on both ends. Determine the frequency of the 2nd overtone, assuming the speed of sound to be 343 m/s. Repeat for the same length tube but with a closed end.
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