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What is the minimum photon energy needed to create an electron - positron pair when a photon collides (a) with a free electron at rest and (b) with a free proton at rest?
A member of an aircraft maintenance crew wears protective earplugsthat reduce the sound intensity by a factor of 380. When a jetaircraft is taking off, the sound intensity level experienced bythe crew member is 84 dB.
Illustrate what is the intensity of the beam transmitted through the three sheets when 1 = 19.0°, 2 = 51.0° and 3 = 100.0° ?
If a positron (a positively charged particle with the mass of the electron) and a proton go through the same potential difference, By what factor is the wavelength shorter
The electric motor in a toy train requires a voltage of 3.1V .Find the ratio of turns on the primary coil to turns on the secondary coil in a transformer that will step the 110V household voltage down to 3.1V .
A machine gun fires 25-g bullets at the rate of 4 bullets per second. What is the average recoil force experienced by the machine gun
A circular wire loop of radius 14.1 cm carries a current of 2.51 A. What is the magnitude of the torque acting on the loop
One of the attempts to contain the spill involved pumping drilling mud into the well to balance the pressure of escaping oil against a column of fluid (drilling mud) having a density significantly higher than that of seawater and oil.
A typical laboratory centrifuge rotates at 4000 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. What is the acceleration at the end of a test tube that is 10 cm from the axis of rotation
A 53 kg springboard diver leaps from a 2m high board by bouncing until she has increased the energy in the board to 1040 joules. What is the maximum height above the water of the diver during her dive
The aorta in humans has a diameter of about 1.9 cm and at certain times the blood speed through it is about 60 cm/s. find the Reynolds number for blood flow through the aorta
A microscope slide is placed in front of a converging lens with a focal length of 2.18 cm. The lens forms an image of the slide 10.3 cm from the slide. How far is the lens from the slide if the image is real
question1a bus travels 330 km south along a straight path with an average velocity of 84 kmh to the south. the bus
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