A cyclotron is designed to accelerate protons (mass 1.67 x 10-27kg) up to a kinetic energy of 2.5 x 10-13 J. If the magnetic field in the cyclotron is 0.75 T, what is the radius of the dipole magnets in the cyclotron?
A. 14 cm
B. 24 cm
C. 17 cm
D. 5.8 cm
B. 24 cm
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Estimate the depth in moist soil at which the annual temperature variation will be 10% of that at the surface.
GIVEN
Moist soil
FIND
The depth in moist soil at which the annual temperature variation will be 10 per cent of that at the surface
ASSUMPTIONS
Conduction is one dimensional
The soil has uniform and constant properties
Annual temperature variation can be treated as a step change in surface temperature with a 6 month
response time
SKETCH
Intensity: Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions.
A. 3.78 W/m2 B. 4.36 W/m2 C. 47.6 W/m2 D. 54.7 W/m2
The materials that made up the solar nebula can be categorized into the four general types as follows. Rank these materials from left to right based on their abundance in the solar nebula, from highest to lowest.
Electron flow is in the direction of conventional current
Indicate whether the statement is true or false