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After a tornado, a 0.50g drinking straw was found embedded 4.5cm in a tree. Subsequens measurements showed that the tree would exert a stopping force of 70N on the straw. What was the straw's speed when it hit the tree?
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Question: It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station is constructed as a 1000-m-diameter cylinder that rotates about its axis. The inside surface is the de ...
Question: The specific heat capacity of water is 4190 J/kg K, its heat of melting is 3.33 x 10^5 J/kg, and its heat of vaporization is 22.6 x 10^5 J/kg. For 1 kg of water, which of the following requires the most thermal ...
Question: A spherical balloon has a radius of 6.95m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. The skin and structure of the balloon has a mass of 960kg . Negle ...
Question: You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend (such that it moves away from y ...
What are (a) the x component, (b) the y component, and (c) the z component of if r=a-b+c if a =8.0i+6.0j-3.3k, b=-5.5i+4.5j +6.0k and c=1.1i+5.6j+6.3k. (d) Calculate the angle between and the positive z ...
What is the (magnitude of the) velocity of a rollercoaster at the bottom of a track that is 89.8 m high if it starts from rest? (Use the value g = 9.8 m/s2 for the acceleration of gravity.) Please provide work to explain
Question: The problem: Two stationary point charges +3.00nC and +2.00nCare separated by a distance of 50.0cm. An electron is released fromrest at a point midway between the two charges and moves along theline connecting ...
Question: The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center . When his hands and arms are brought in and wrapped around his ...
Question: The starter motor of a car engine draws an electric current of 110 A from the battery. The copper wire to the motor is 4.20 mm in diameter and 1.73 m long. The starter motor runs for 0.95 s before the car engin ...
A high-energy muon was produced in the upper atmosphere 80 km above the sea level. 380 μs later, a detector at the sea level detected it. a. How long was the journey according to this muon? b. What was the proper time fo ...
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