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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?
A weather balloon filled with helium gas has a volume of 279 m3, What is the new volume of the balloon
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Find out the magnitude and direction of forces
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An ac generator with a frequency of 1.54kHz and an rms voltage of 22.2V is connected in series with a 1.90k, What is the power factor for this circuit
A certain ohmic resistor has a resistance of 45 ohms. A second resistor is made of the same material but is two times as long, What is the effective resistance of the two resistors in series
An airplane has a mass of 2.6 x10^6 kg, and the air flows past the lower surface of the wings at 95m/s. If the wings have a surface area of 1200m2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the air?..
At a certain distance from a charged particle, the magnitude of the electric field is 546 V/m and the electric potential is -2.60 kV, What is the distance to the particle
A ceiling fan with 80-diameter blades is turning at 68. Suppose the fan coasts to a stop 27 after being turned off. What is the speed of the tip of the blade 10 after the fan is turned off.
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