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The 1951 educational film "Duck and Cover" was commissioned by the United States Federal Civil Defense administration. The film featured an animated character Bert the Turtle whose defense mechanism of retreating into his shell at the sign of danger was meant to teach school children what?
Select one:
a. How to avoid the danger of tornados, hurricanes, or other strong storm activity.
b. What to do in the event of a sudden attack by atomic weaponry without sufficient warning to get to other shelter.
c. How to locate a designated fallout shelter in the event of a nuclear war.
d. What to do at home, school, or abroad in the event of civic unrest.
A 11.0kg box slides 4.0m down a frictionless30 degree incline, then collides with a spring whose springconstant is 180N/m. What is the maximum compression of the spring inmeters?
How fast (in rpm) must a centrifuge rotate if a particle 6.6cm from the axis of rotation is to experience an acceleration of 200000g's
Two converging lenses, each of focal length 14.5 cm, are placed 59.2 cm apart, and an object is placed 27.4 cm in front of the first. Where is the final image relative to the second lens formed
Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of +10q. Sphere B carries a charge of -7q. Sphere C carries no net charge. How much charge ends up on sphere C
A jumper in the long-jump goes into the jump with a speed of 12m/s at an angle of 20 deg above the horizontal. How long is the jumper in the air
There are two identical, positively charged conducting spheres fixed in space. The spheres are 45.4 cm apart, find the initial charge on each sphere
A 72.0-kg log falls from a height of 20.0 m into a lake. find the change in entropy of the air during this process
A gravitron ride at a fair consists of a large cylinder of radius15.0m, spinning about its vertical axis of symmetry. how many revolutions per minute must the cylinder execute
An oscillating dipole antenna 1.60 meter long with a maximum 40 mV potential creates a 500 Hertz electromagnetic wave. Find the wavelength of the electromagnetic wave
You are traveling on an airplane. The velocity of the plane with respect to the air is 110 m/s due east. What is the speed of the plane with respect to the ground
An oven may be regarded as a cube, each side 1.2m long. The oven stands on thin legs and the heat transfer through each of the six faces is identical.
A gun tilted upward at 41 degrees above the horizontal fires a bullet with a speed of 216 m/s. The bullet travels as a projectile and lands at the same height as the gun.
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