Pressure: One of the dangers of tornados and hurricanes is the rapid drop in air pressure that is associated with such storms. Assume that the air pressure inside of a sealed house is 1.02 atm when a hurricane hits. The hurricane rapidly decreases the external air pressure to 0.910 atm. What net outward force is exerted on a square window of the house that is 2.03 m on each side? (1.00 atm = 1.01 × 105 Pa)
A. 4.59 × 104 N
B. 5.19 × 104 N
C. 4.82 × 105 N
D. 5.42 × 105 N
Answer: A
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Change in internal energy is
A) 1 – Qcold/ Qhot. B) Q/m. C) Qout/ Win. D) Q - W. E) 1 - Tcold/ Thot.
A jet of water flowing from a hose at 18 m/s is directed against a wall. If the mass flow in the fluid stream is 2.0 kg/s, what force is the water applying to the wall if backsplash is negligible?
a. 36 N b. 0.11 N c. 38 N d. 350 N e. 34 N
A crystal diffracts a beam of electrons, like a diffraction grating, as they hit it perpendicular to its surface. The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface
(e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?