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He would like a prescription for contact lenses to serve the same purpose. What is the correct contact lens prescription, in diopters?
Neglect the weight of the ball, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction
As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halt at the top of the building. Find the time t.
The cables make a 20° angle with the ship and the tension force in each cable is 5.00x10N. What is the total net work done on the ship by the two trains?
A blue supergiant star has surface temperature of 32KK and has total power output 100000 times that of the Sun. Where is the Wien peak of the star's blackbody curve?
If 64% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change?
What is the length of the moment arm from the knee joint to the applied force?
The brakes of a truck cause it to slow down by applying a retarding force of 3.0x10^3N to the truck over a distance of 850m All of this takes place on a horizontal flat surface · What is
A 640 g hollow ball 28 cm in diameter is suspended by a wire and is undergoing torsional oscillations at a frequency of 0.78 Hz. What is the torsional constant of the wire?
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?