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The larger the mass of a star, the shorter its Main Sequence lifetime becomes.
a) Estimat the Main Sequence lifetime of a star with a mass of 6 Msolar.
b) It is believed that such a star lived longer when the Universe was still very young. Can you think of a reason why?
The dipole moment of a water molecule in liquid water is 6.2×10-30 C•m, and the effective diameter of the water molecule is 2.8×10-10 m. In an earlier homework problem the effective dipole charge separation for water was calculated as 1.9×10-11 m.
What is a quantum well: give an example of structure, growth method to make quantum wells and quantum states i.e. outline quantization using diagrams
A krypton laser produces a cylindrical red laser beam 2.0 in diam with 2.0 of power. What is the light intensity on a wall 2.5 away from laser.
A circuit with 2 capacitors, C1 = 22.0 ?F and C2 = 16.0 ?F, are hooked up in parallel to each other, Calculate how much energy each capacitor can store
An apple is dropped from a 25m cliff. At the similar time, a person at the bottom of the cliff fries an arrow up towards the apple. The arrow sticks the apple 0.450 seconds later.
How much time does the object take to reach the ground.
A computer is reading data from a rotating CD-ROM. At a point that is 0.030m from the center of the disk, centripetal acceleration is 120m/s2. What is the centripetal acceleration at a point that is 0.05 m from the center of disc.
The initial angle of the ball’s motion off the tee is 29.0° above the horizontal. If the tee level is 17.0 m above the level of the fairway, explain how far east of the tee does the ball hit the fairway?
The stairs are 83 long and inclined at the angle of 31. If a player has a mass of 87, estimate his average power output on the way up. Overlook friction and air resistance.
Determine the simple harmonic motion of the spring what ac velocity is ball moving
Some people think that they can stop themselves rushing forward by putting their hands on the dashboard. Find out the mass of the object that has a weight equal to force you just calculated.
explain the shape of the distribution of sample means.
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