A submarine is at a depth of 500 m under the water. The force on a circular hatch of 1.00 m in diameter due to the seawater 
pressure from outside the submarine is
A. 
B. 
C. 
D. 
E. 
B.
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A runner maintains constant acceleration after starting from rest as she runs a distance of 60.0 m. The runner's speed at the end of the 60.0 m is 9.00 m/s. How much time did it take the runner to complete the 60.0 m distance?
A) 6.67 s B) 15.0 s C) 9.80 s D) 10.2 s E) 13.3 s
A stream of electrons passes through a velocity filter where the crossed magnetic and electric fields are 0.020 T and 5.00 × 10^4 V/m, respectively. Find the kinetic energy (in electron volts) of the electrons passing through the filter. [1 eV = 1.60 × 10^?19 J]
The first small solid grains or flakes formed in our solar system by the process of ____________, the addition of material to an object an atom or molecule at a time
a. accretion b. sublimation c. hydration d. condensation e. vaporization
Which of the following best explains the phenomenon of black hole evaporation?
A) Due to high temperatures in the accretion disk around a black hole, material evaporates from the black hole like water evaporating from the ocean. B) Particles (or antiparticles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Particles (or antiparticles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. E) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists but doesn't really occur.