The pressure inside a commercial airliner is maintained at 1.00 atm (105 Pa). What is the net outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure is 0.30 atm?
a. 140 N
b. 1 400 N
c. 14 000 N
d. 140 000 N
d
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What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) The light that they emit is so weak that it is undetectable to our telescopes. B) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. C) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. D) They interact with other matter only through the weak force and not through gravity or any other force.
High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact
Which type of rock solidifies from molten magma?
a) igneous rock b) sedimentary rock c) metamorphic rock d) cross-bedded rock
Einstein described science as beginning with:
a. an intuitive leap that creates an axiom, defining a set of consequences for the axiom, and testing those consequences against the material world. b. an intuitive leap that creates an axiom, and testing the axiom against the material world. c. an intuitive leap that creates an axiom, and defining a set of consequences for that axiom. d. accepting each axiom as true and not testing it whenever it comes from an authoritative source. e. defining a set of consequences for an axiom, and testing those consequences against the material world.