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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.
An electron is released from rest at the negative plate of a parallel plate capacitor. How fast is the electron moving just before it reaches the positive plate
questiona cart of mass m 1.80 kg can roll without friction on a level track. a light string draped over a light
During liftoff, a hot-air balloon accelerates upward at a rate of 3.4 . The balloonist drops an object over the side of the gondola when the speed is 17, How long does it take to hit the ground
An object, at the top of a very tall building, is released from rest and falls freely due to gravity. Neglect air resistance and calculate the distance covered by the object between times t1 = 5.57 s and t2 = 7.59 s after it is released.
A solid cyclinder of mass 2.0 kg and radius 0.2 m is rotating uniformly at an angular velocity 2.0 rad/s around the fixed axis through the center O. What is the moment of inertia of the cyclinder
A sample of CO2 has a mass of 50 g. What is the number of molecules of carbon dioxide in the 50 g sample
An ideal gas in a container is at a temperature of 70.6°C. What is the average translational kinetic energy of a gas molecule in the container
A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 41kg barbell straight up from chest height to full arm extension, a distance of 0.45m.
If the induced voltage is 0.5 V, as B field is decreasing at a rate of 0.5 T/s in a loop. Calculate the area of the loop
Two wires are identical, except that one is aluminum and one is nichrome. The aluminum wire has a resistance of 0.21 ?. What is the resistance of the nichrome wire
A capacitor of value C is connected across a battery of voltage V. The capacitor is fully charged. Find the new charge on the capacitor
A woman stands at the center of a platform. The woman and the platform rotate with an angular speed of 5.20 rad/s. Friction is negligible. Find her new angular speed
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