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The current in an RL circuit builds up to one-third of its steady-state value in 3.80 s. Find the inductive time constant.
A current of 1.35 A in an inductor L results in a stored energy of 0.135 J. The current is then changed to 6.48 A in the opposite direction. Calculate the change in the stored energy.
You look directly at a point on the water that is a horizontal distance 2.4 m away from your eye in order to see the coin at the bottom of the river. a) At what angle of incidence from the normal to
The mass is released from rest with the spring initially unstretched. the mass drops .100 m before stoping and then moving upward. a) what is the maximum speed of the mass
Suppose you wanted to be able to see small details on the Moon using an optical telescope. What is the smallest diameter of the objective lens required to resolve a 2.40 m object on the Moon?
Automotive airbags inflate when sodium azide, NaN3, rapidly decomposes to the elements. a. Write a balanced chemical equation for this reaction.
A child tosses a ball straight up. She says the ball is moving away from her hand because the ball feels an upward "force of the throw" as well as the gravitational force. (a) Can the "force of the
A second rope wrapped around another section of radius R2 = 0.50m exerts a force F2 = 6.0 N downward. a. What is the angular acceleration of the cylinder?
Design a transformer that will provide at the secondary 12v at 5 A when the primary is connected to 120 v, 60 Hz. Determine the number of turns in the primary and secondary windings if the core has
If the average volume flow of blood through the aorta is 9.4 x 10-5 m3/s and the cross-sectional area of the aorta is 2.8 x 10-4 m2, what is the average speed of blood in the aorta?
Two coupled identicle pendula of mass 3 kg are oscillating, having started at rest with positions x1(0) = 0.22m and x2(0) = -0.15m. Mass 1 has Tfast = 0.5s (where Tfast is the period of the rapid o
The screen is now moved 2.1 m further away. What is the new distance between the central and the second-order bright fringe?
A particle of mass m0 is given a kinetic energy equal to one-fourth its rest-mass energy. How fast must the particle be traveling?
A yo-yo has a rotational inertia of 1080 g·cm2 and a mass of 140 g. Its axle radius is 2.5 mm, and its string is 110 cm long. The yo-yo rolls from rest down to the end of the string. (a) What
Find the resonance frequency of the ear canal. Treat it as a half-open pipe of diameter 7.3 mm and length 24.5 mm. Assume that the temperature inside the ear canal is body temperature (37 °C).
The frequency of its siren that you hear is 1260. Hz. Once it passes, the frequency is 1030. Hz. What is the actual frequency of the ambulance's siren?
The accereration due to gravity, near the surface of the Earth, in SI units is approximately 9.81 m/s^2. An object initially at a height of 100 m is released from rest at time t = 0 seconds. Neglect
The distance between the objective and eyepiece is 14.0 cm. If a blood cell subtends an angle of 2.1 multiplied by 10-5 rad when viewed with the naked eye at a near point of 27.0 cm, what angle (magn
A nonreflective coating (n = 1.42) covers the glass (n = 1.52) of a camera lens. Assuming that the coating prevents reflection of yellow-green light (wavelength in vacuum = 564 nm), determine the m
A proton beam that carries a total current of 8.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center.
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. When this light illuminates a certain diffraction grating it produces a first-order principal maximum at an angle of 1.350
The average density of a fish can be found by first weighing it in air and then finding the scale reading for the fish completely immersed in water and suspended from a scale. If a fish has weight 2
If instead the second disk is set spinning at 780 rpm in the direction opposite the first disk's rotation, what is the angular speed after coupling?
What is the magnitude of its angular momentum relative to the point (-2.0,-2.0) m at this same moment?
A grade school student plans to build a 38-power telescope as a science fair project. She starts with a magnifying glass with a focal length of 5.5cm as the eyepiece. What focal length is needed for