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help Opening a Door Due this Friday, Oct 5 at 11:59 pm (EDT) When opening a...
LUULEED A Noisy Room (Ranking) Due this Friday, Oct 18 at 11:59 pm (EDT) You are standing in the middle of a large room listening to a cacaphony of sounds. Rank the intensity of the sounds from each source (1 loudest, 2 next loudest, ...) Consider al objects to be right next to you. If two values are within 0.1 dB from each other, consider them to be the same. An object emitting a sound with an intensity level of...
Electrostatic Forces - 3 Charges I Due this Friday, Jan 25 at 11:59 pm (EST) Calculate the Coulomb force on q1, as seen in the figure below. Choose forces to the right be positive and forces to the left negative. a1 2 2 Assume q1 = 1.80 μC, q2 = 5.26 μC and q3 =-2.32 μC, r1 = 3.45 cm and r2 = 2.08 cm. Submit Answer Tries 0/10 Calculate the Coulomb force on q2. Submit Answer Tries 0/10 Calculate...
21-3 Sound Intensity Mar 30 at 11:59 Level Due this Frida pm (EDT) At a distance of 4.75 m from a localized sound source, you measure the intensity level as 73.0 dB. How far away from the source must you be for the intensity level to fall to 50.5 dB? Submit AnswerTries 0/15 Post Discussion Send Feedback
Why is the answer E and not A? 19. When opening a door, you push with a force with magnitude F and which is directed perpendicularly to the door. If you apply the force closer to the hinges of the door.. A. the torque you exert and the angle the door moves through for a given distance which your B. the torque you exert will be larger, but the angle the door moves through for a given distance C. there...
Block and Spring irn SHM with damping Due this Friday, Apr 20 at 11:59 pm (EDT) A block of mass 29.00 g on the end of spring undergoes simple harmonic motion with a frequency of 4.00 HZ What is the spring constant of the spring? 11.7 N/m Submit AnswerIncorrect. Tries 1/14 Previous Tries If the motion of the mass has an initial amplitude of 3.00 cm what is its maximum speed?. Submit Answer Tries 0/14 The amplitude decreases to 0.848...
Block and Spring in SHM with damping Due this Friday, Apr 19 at 11:59 pm (EDT) A block of mass 15.00 g on the end of spring undergoes simple harmonic motion with a frequency of 2.00 Hz. What is the spring constant of the spring? Submit Answer Incorrect. Tries 1/14 Previous Tries If the motion of the mass has an initial amplitude of 2.00 cm what is its maximum speed?. Submit AnswerTries 0/14 The amplitude decreases to 0.445 cm in...
Review: Square Coil, Round Hole Due this Friday, Mar 29 at 11:59 pm (EDT) A square, single-turn wire coil L-1.42 cm on a side is placed inside a solenoid that has a circular cross section of radius r 2.71 cm, as shown in the figure below. The solenoid is 17.4 cm long and wound with 100 turns of wire. If the current in the solenoid is 2.72 A, find the flux through the coil Submit Answer Tries 0/10 If the...
Prescribing Eyeglasses - Hyperopia Due this Friday, Mar 30 at 11:59 pm (EDT) Suppose you have hyperopia (you are farsighted). You can clearly focus on very distant objects, but any object which is closer than 43.7 cm from your eyes will appear blurry unless you use glasses. The purpose of glasses would be to make objects that are close to you appear to be at your near point. What would be the refractive power (in diopters - do not enter...
Submarine crew escapes Due this Sunday, Jun 23 at 08:00 pm (EDT) Crew members attempt to escape from a damaged submarine 97.0 m below the surface. What force must be applied to a pop-out hatch which is 1.2 by 0.35 m, to push it out at that depth? Assume that the density of the ocean water is 1024 kg/m3 and the internal air pressure is at 1.00 atm. Submit Answer Tries 0/12 Post Discussion Send Feedback
Strength of Cobalt-60 Source Due this Friday, Apr 20 at 11:59 pm (EDT) Many radioisotopes have important industrial, medical, and research applications. One of these is 60Co, which has a half-life of 5.20 years and decays by the emission of a beta particle (energy 0.310MeV) and two gamma photons (energies 1.17 MeV and 1.33 MeV). A scientist wishes to prepare a 60Co sealed source that will have an activity of at least 10.4 Ci after 24.0 months of use. If...