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Spiderman uses his spider web to save a runaway train. His web stretches a few city blocks before the 104 kilogram train comes to a stop. Suppose the web acts like a spring, determine the spring constant.
A ball is thrown straight up by a speed of 30m/s. How long does it take to reach the maximum height? What is the Max height reached by the ball? What is the speed after 4.2s?
An object is located 13.9 cm in front of a convex mirror, the image being 8.89 cm behind the mirror. A second object, twice as tall as the first one, is placed in front of the mirror, but at a different location.
A mirror creates an image of magnification ?1/3. (a) Is the image upright or inverted? (b) If the object is 7.75 cm tall, what is the height of the image
An ideal gas of p=1000 hPa, V=1 m3, T=20 C undergoes the following successive changes: (1) it is warmed under constant pressure until its volume double, (2) it is warmed under constant volume until its pressure doubles, and (3) it expands isothermall..
a all our household circuits are wired in parallel. below is an example of a simple household circuit with 3 identical
A 0.38 kg iron horseshoe that is initially at 580°C is dropped into a bucket containing 21.8kg of water at 21 °C. What is the final equilibrium temperature (in °C)? Avoid any heat transfer to or from the surroundings. Do not enter units.
a flywheel of mass 12kg and radius 20cm is mounted on a light horizontal axle of radius 5cm which rotates on
A certain musical instrument is a tube with one end open and the other end closed. The second-lowest frequency that it can play is 1500 Hz. What is the fundamental frequency
ferromagnetism is caused by:
Calculate the angular velocity of an electron orbiting a proton in the hydrogen atom, given the radius of the orbit is 0.500x10-10 m
a stick of uniform density with mass m 8.3 kg and length l 0.8 m is pivoted about an axle which is perpendicular to
The electron beam Cathodes and anodes An electron gun usually consists of a cathode and an anode. The cathode is a filament that is connected to a potential difference (filament voltage), and the resulting current heats the filament to incandescen..
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