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(a) When the universe was a mere 10^-4 s old, the temperature was about 10^13 K. What is the probability that two average protons could fuse in this opening split second?
(b) Ages later when the universe was 1s old, the temperature fell to only 10^10. What is the probability that two average protons could fuse in this second?
(c) Compare these probabilities to the likelyhood of being struck by lightning in a given year.
A golf ball strikes a hard, smooth floor at an angle of 30 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.047 kg, its speed is 45 m/s just before and after striking the floor. What is the magnitude of the impuls..
A block of mass 77 g floats on a fluid, oscillating up and down at a frequency of 8 Hz. What is the value (in N/m) of the effective spring constant of the fluid
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 rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30 . At 30.0 after blastoff, the engines suddenly fail, How high above the launch pad will the rocket eventually go
A 0.2-kg ball is bounced against a wall. It hits the wall with a speed of 20 m/s at a 10 degree angle and rebounds elastically at a 10 degree angle
question a carnot engine whose high-temperature reservoir is at 580 k takes in 520 j of heat at this temperature in
A fugitive tries to hop on a freight train traveling at a constant speed of 5.4m/s . Just as an empty box car passes him, What is the distance traveled to reach the box car
A proton is at the origin and an electon is at the point x = 0.41 nm, y = 0.36 nm. Find the electric FIELD at the proton,
Suppose we allow two mass in a one-dimensional diatomic lattice to become equal. What happens to the frequency gap? Is this answer expected? Compare the results with those of the monatomic lattice.
Amber (n = 1.546) is a transparent brown-yellow fossil resin. An insect, trapped and preserved within the amber, How far below the surface is the insect actually located
A 6.0 ohm and 12.0 ohm resistor are connected in series to a 36V battery. what is the current through each resistor
a sphere of radius a in free space is nonuniformly charged over its surface such that the charge density, Compute the total charge of the sphere
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