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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 string passes over a frictionless pulley and connects a 250 g block to 2.00 kg block. The inclines are frictionless. Assuming you release both masses from rest, how much time would it take the 250g to travel 2200cm next to the ramp.
An alpha particle (the nucleus of a helium atom, with charge +2 and a mass four times that of a proton), What is the speed of the antiproton when the particles are 1.6 nm apart
A proton and an alpha particle (q = +2e, m = 4 u) are fired directly toward each other from far away, each with an initial speed of 0.012c. What is their distance of closest approach
A potential difference of 100 mV exists between the inner and outer surfaces of a cell membrane. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell
If the parachutist comes to rest with constant acceleration over a distance of 0.710 m, illustrate what force does the ground exerts on her?
A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
The top of a refrigerator has an area of 0.6m2. The height of the refrigerator is 180 cm. What volume does refrigerator occupy in cubic meters.
A 60 (g} tennis ball with an initial speed of 32 {m/s} hits a wall and rebounds with the same speed. The figure shows the force of the wall on the ball throughout the collision.
find the magnitude of the initial acceleration. At what height above the surface of the earth does the balloon have a speed of 7.30 m/s.
Calculate change in kinetic energy
A swimming pool has dimensions 32.0 m ? 12.0 m and a flat bottom. The pool is filled to a depth of 2.30 m with fresh water. What is the force exerted by the water on the bottom
determine the mass of liquid ammonia that boils away before thermal equilibrium. Assume an excessive amount of liquid ammonia is present and that the liquid ammonia does not react with the copper.
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