Describe the two step process used to calculate thermal stress in a beam with ends which are rigidly fixed
What will be an ideal response?
(1 ) the beam tries to expand (or contract) by some amount due to a temperature change
(2 ) the solid in contact with the beam exerts a force to compress (or expand) it, keeping it at its original length
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Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m
A 10.0-m-long copper wire with cross-sectional area 1.25 × 10^–4 m2 is bent into a square loop, and then connected to a 0.25-V battery. The loop is then placed in a uniform magnetic field of magnitude 0.19 T. What is the maximum torque that can act on this loop? The resistivity of copper is 1.70 × 10^–8 ?·m
a. 2.2E+2 N·m b. 1.8E+2 N·m c. 9.7E+2 N·m d. 5.6E+2 N·m
Briefly describe how the solar wind affects magnetospheres and how aurora are produced
What will be an ideal response?
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 106 m, R = 5.0 × 106 m, and M = 4.0 × 1024 kg.
A. 7.8 km/s B. 3.5 km/s C. 5.4 km/s D. 6.9 km/s E. 4.8 km/s