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A century ago, scientists believed that the universe was infinite with no beginning and no end. Einstein then predicted that the universe is either contracting or expanding. Why do you think Einstein thought that the universe had no beginning? Do you think that a universe with a definite beginning in time has any important philosophical implications? Explain.
What is velocity of wind that is moving the plane
A 30 g particle undergoes SHM with an amplitude of 2.0 mm and a maximum acceleration of magnitude 8.0 multiplied by 103 m/s2, determine the total mechanical energy of the oscillator
A sledge loaded with bricks has a total mass of 17.0 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. What is the mechanical energy lost due to friction
A 2.0 uF capacitor is first charged by being connected across a 6.0 V battery. Find the charge on each of the capacitors
In 1980, over San Francisco Bay, a large yo-yo was released from a crane. What was the tension in the cord on which it rolled
A rectangular pipe carries water over a horizontal distance of 10m. At what speed does water enter the pipe
Two skaters each of mass 50 kg approach each other along prallel paths separated by 3 m. describe quantitativley the motion of the skaters after they have become connected by the pole
A source of radio waves is emitted from the center of our galaxy 1.8 x 104 light years away. How much power do the radio waves carry
Presume the needle moves 7.5 mm from its highest to its lowest position and it makes 26 stitches in 9.1 s. What is the highest needle speed.
How much heat must be absorbed by ice of mass m = 720 g at -10 degrees Celsius to take it to liquid state at 15 degrees Celsius
A 5.0 kig block is hung from the ceiling on a 2.0-meter-long wire with a mass of 4 g. How long does it take the pulse to reach the ceiling
Three balls with masses of 6 g at (1,9), 1 g at (7,6), and 7 g at (5,1), respectively, are connected by massless rods. What is the acceleration of the center of mass
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