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Question1
A theory of nuclear astrophysics proposes that all the elements heavier than iron are formed in supernova explosions ending the lives of massive stars. Imagine equal amounts of 235U and 238U were created at the time of the explosion and the present 235U/238U ratio on the Earth is 0.007 25. The half-lives of 235U and 238U are 7.04 108 yr and 4.47 109 yr, respectively. How long ago did the star(s) explode that released the elements formed the Earth?
Question2
A circular conducting loop with a radius of 0.35 m and a small gap filled with a 10.5 Ω resistor is oriented in the xy-plane. If a magnetic field of 1.5 T, making an angle of 30° with the z-axis, increases to 15.0 T, in 7.0 s, what is magnitude of the current that will be caused to flow in the conductor?
Question3
Marianne really likes coffee, except on summer days she doesn't want to drink a hot beverage. If she is served 240ml of coffee at 88C in a well-insulated container, how much ice at 0C should she add to get a final temperature of 34C?
A 2.6kg block slides along a frictionless surface at 2.0m/s . A second block, sliding at a faster 5.0m/s, collides with the first from behind and sticks to it. What was the mass of the second block
Find the critical angle for an optical fiber whose core has n value of 1.55 and whose cladding has n value of 1.20
A man uses a tire iron to loosen his lug nuts. The tire iron is 25cm long. The man applies a force of 30N at an angle of 29° to the iron. What is the torque that is applied to the lug nut
A light beam containing red and violet wavelengths is incident on a slab of quartz at an angle of incidence of 50.00°. Find the dispersion of the slab, which is defined as the difference in the angles of refraction for the two wavelengths
An ancient manuscript reveals that a owner of a vineyard in Rome held 2 selions of plowed land plus a livestock area of 20 perches by 5 perches
Given the electrostatic potential field as a function of position V(x,y,z) = 5x^3 y + 5yz +z^2 , determine the electric field vector E
Find the torque required to over come the viscous force in a journal bearing having Radius of journal R , angular velocity w length of the bearing L and thickness of oil film t
A 1.8-m-long steel wire in a musical instrument has a radius of 0.02 mm. When the wire is under a tension of 88 N, how much does its length change
Water flows from a fire truck through a hose that is 10.7 cm in diameter and has a nozzle that is 2 cm in diameter. what is the gauge pressure in the truck
The charge experiences a magnetic force of 7.41 10-3 N. A second charge q2 = 4.00 µC travels at an angle of 40.0° with respect to the same magnetic field and experiences a 1.80 10-3-N force. Identify the magnitude of the magnetic field and the ..
A space traveler weighs 535 N on earth. What would the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth.
A telescope mirror has a radius of curvature of 18.0 m. What is the diameter of the image of the Moon produced by this mirror
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