Electrons are ejected from a metal surface with the speeds ranging up to v=4.6x10° m/s when light with a wavelength of 625 nm is used. What is the work function of the surface? What is a stopping potential?
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- An airplane is pressurized with air to 650 mmHg. a. If air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100 mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?Pressure cookers have been around for more than 300 years, although their use has strongly declined in recent years (early models had a nasty habit of exploding). How much force (in N) must the latches holding the lid onto a pressure cooker be able to withstand if the circular lid is 21.0 cm in diameter and the gauge pressure inside is 2.60 atm? Neglect the weight of the lid. NWhich statement is incorrect about gases, liquids, and solids? O Gases and liquids flow so they are both fluids. O Liquids and solids are hard to compress. O All these statements are incorrect. O Solids and gases take the shape of containers they arc in.
- Part A How deep underwater should you dive to quadruple the atmospheric pressure at the surface? Note: 1 m = 3.28 ft. Express your answer in feet to one significant figure. Π. ΑΣΦ h=135.65 B Submit Previous Answers Request Answer Provide Feedback ? X Incorrect; Try Again; 5 attempts remaining ft P PearsConsider the following section of pipe. The velocity of water (Pwater h₁ m S V₁ = 2.9 h₁ = 3.2 m V₂ = 6.7 h₂ = 1.9 m m S Point 1 = 1000 kg ) and height are given for two different points in the pipe. Use this information to answer the following questions. m What is the ratio of the cross-sectional area at point 1 to the cross-sectional area at point 2? A₁ A₂ What is the difference in pressure between points 1 and 2? (Find P2 - P₁. Include a negative sign if that's what you calculate.) P2 - P1 = Pa Which direction is the water flowing through the pipe? Point 2 h₂A thin-walled hollow spherical ball of mass 0.4 kg and radius 0.1m is filled with alcohol of density 800 kg/m3. It is released from the bottom of a pool filled with water. a. sketch a FBD for the ball b. write out newtoon's 2nd law equation c. Find the acceleration of the ball