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A bridge is made with segments of concrete 94 m long (at the original temperature). If the linear expansion coefficient is 1.2 × 10-5 (C)-1, how much spacing is needed to allow for expansion for an increase in temperature of 69F?
You are driving to the grocery store at22m/s. You are125m from an intersection when the traffic light turns red. How long does it take you to stop
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 28.5° and the angle of refraction is 16.6°, find the critical angle for the liquid
In a new (inelastic) collision, the same two bumper cars with the same initial velocities now latch together as they collide. What is the final speed of the two bumper cars after the collision
a 1.99 kg block slides on a rough, horizonatl surface. The block hits a spring with a speed 2.16 m/s, what is the force constant of the spring
A tire 0.650 m in radius rotates at a constant rate of 150 rev/min. What is the acceleration of the stone
Consider the transitions 3d -->2p in hydrogen. Calculate the possible energies of emitted photons, How many photon lines are there
A horizontal 799-N merry-go-round is a solid disk of radius 1.45 m, started from rest by a constant horizontal force of 49.9 N applied tangentially to the edge of the disk
A compressive force of 2.7×104N is exerted on the end of a 24-cm-long bone of cross-sectional area 3.9cm2. By how much will the bone shorten
A jet plane is flying with a constant speed along a straight line, at an angle of 30.0? above the horizontal. The plane has a weight W? of magnitude 86,500N, What is the magnitude of the thrust force
A transverse periodic wave is represented by the equation z(y,t) = 3.2 cm sin( 5m^-1 y + 1500 rad/s t). What is the frequency of the vibration of the wave? Give answer in Hz
Three resistors, 28, 48, and 80 ?, are connected in series, and a 0.53-A current passes through them, What is the equivalent resistance
Two wooden crates rest on top of one another. The smaller top crate has a mass of m1 = 16.0 kg and the larger bottom crate has a mass of m2 = 90.0 kg. find the frictional force the lower crate exerts on the upper crate
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