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The spring inside a pogo stick is normally uncompressed and has a maximum of 450mm of travel before bottoming out. What is the minimum spring constant so that the spring does not exceed its maximum travel when a 90kg man jumps off a 2.5m high roof?
In the experiment you will observe well defined "bumps" in the string, and you will measure their length. What is the relation between this length and the wavelength of the wave
Three 1.50-V cells, each with an internal resistance of 0.0500?, are connected in series to form a battery with a current of 0.850A in each cell. Find the current in the external circuit
In preperation for building a space station, an astronaut removes a self-teliscoping uniform rod form the cargo bay and releases it, What is the angular speed after the catch slips
A 50.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11× 10 -8 ?m, What must be the diameter of the wire
A typical digital cell phone emits radio waves with a frequency of 1.9 GHz. how many photons are emitted each second
A rescue helicopter lifts a 60 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2, How much work is done by the tension in the cable
Choose the picture that shows the correct structure of an atom and its main parts. Select one: a. atom2 b. atom1 c. atom3 d. atomic structure Question 2 Not yet answered Marked out of 1 Not flaggedFlag question Question text The charged particles of ..
Consider a heat engine that operates between thermal reservoirs at 510 K and 242 K. Suppose the engine does 4900 J of work while it expels 103 J of energy to the cold reservoir. Is this engine possible in the real world? Hint: Violations of the secon..
q1. an archer puts a 0.54 kg arrow to the bowstring. an average force of 202 n is exerted to draw the string back 1.3
An electric eel generates electric currents through its highly specialized Hunter's organ, in which thousands of disk-shaped cellscalled electrocytes are lined up in series, very much in the sameway batteries are lined up inside a flashlight.
A sled, which has amass of m=125kg., is sitting on an icyhorizontal surface. find the magnitude of the normal force acting on the sled
The rock reaches a maximum height of 2×10^3 m, above the surface of the planet, before it falls back down. What was the first speed of the rock as it left the astronaut's hand.
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