A person stands 3.2 m in front of a wall that is covered floor-to-ceiling with a plane mirror. His eyes are 1.6 m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the light will reach his...
For stable interference to occur, the phase difference must be incoherent. ~ incoherent ~ monochromatic. ~ 1/2 (wavelength) ~ constant.
A 17000- jet takes off from an aircraft carrier via a catapult. The gases thrust out from the jet's engines exert a constant force of 120 kN on the jet; the force exerted on the jet by the catapult is plotted in the figure b. (Intro 1 figure) Determine the work done on...
A sound wave has a frequency of 700 Hz in air and a wave length of 0.50 meters. What is the temperature of the air?
The distance from the Earth to Polaris is approximately 5.35 10^18 m. How long would it take to disappear from our vision if it were to burn out today? Answer in units of years.
Figure P6.59 shows a Ferris wheel that rotates four times each minute and has a diameter of 20.0 m Figure P6.59 (a) What is the centripetal acceleration of a rider? m/s2 (b) What magnitude force does the seat exert on a 50.0 kg rider at the lowest point of the ride? N (c) What magnitude...
A 50 g ice cube floats in 185 g of water in a 100 g copper cup; all are at a temperature of 0 C. A piece of lead at 98 C is dropped into the cup, and the final equilibrium temperature is 12 C. What is the mass of the lead?
The toadfish makes use of resonance in a closed tube to produce very loud sounds. The tube is its swim bladder, used as an amplifier. The sound level of this creature has been measured as high as 81 dB.
The 3.50 , 40.0-cm-diameter disk in the figure is spinning at 330 .
A roller coaster, shown in Fig. 6-38 (h1 = 50 m, h2 = 15 m, h3 = 24 m), is pulled up to point A where it and its screaming occupants are released from rest. Assuming no friction, calculate the speed at points B, C and D. point B
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1. Can you show me step by step how to solve this problem?:
- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas