A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is 0.25 psi
Indicate whether the statement is true or false
T
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The Schwarzschild radius of a 1 black hole is approximately
a. 3 km. b. 1,500,000 km, the size of the Sun c. 150,000,000 km or 1 AU. d. 3 x 1013 km or 1 pc.
Why don't the nuclei of atoms contain any types of quarks but ups and downs?
A: Those are the only kind of quarks that exist. B: Only those types of quarks have positive charges. C: Only those types of quarks have negative charges. D: The other flavors are not massive enough. E: The other flavors do not live for very long.
A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K
If the same pull instead acts over twice this distance: A) The sled's speed will be 2v and its kinetic energy will be 2K. B) The sled's speed will be 2v and its kinetic energy will be K . C) The sled's speed will be v and its kinetic energy will be 2K. D) The sled's speed will be v and its kinetic energy will be K . E) The sled's speed will be 4v and its kinetic energy will be 2K.
A sound wave in brass has a displacement amplitude of 3.00 mm. The frequency of the sound wave 750 Hz and the velocity is 2,813 m/s. If the density of brass is 
then what is the pressure amplitude of the sound wave?
A. 
B. 
C. 
D. 
E. 