![amazingmariah1234](/avatars/8546.jpg)
amazingmariah1234
03.07.2019 •
Physics
A)a hot water tank is fitted with a 3.0 kw electric heater. it is drained for repair and valves connecting it to the rest of the plumbing system are closed. inadvertently, the heater is switched on with the valves closed. at this time, the tank contains 0.40 m3 of air at 290 k and atmospheric pressure, 1.0x105 n m-2. if a seal on the tank ruptures at an internal pressure of 1.2 x 105 n m-2, how long from the moment of switching on does the plumber have to discover his mistake before the seal ruptures? the heat capacity of the tank is 5.9 kj k-1. you may assume that the the tank is thermally isolated and has a constant volume, and that the air in the tank behaves as an ideal diatomic gas with 5 degrees of freedom. (hint: use the change in pressure to calculate the temperature at which the seal ruptures, then calculate the energy required to heat the tank to this temperature. use the ideal gas law to calculate the number of moles of gas in the tank, and the fact that it is diatomic to calculate its heat capacity at constant volume. hence calculate the energy required to heat the gas. combine these two energies and hence calculate the time required for the process.) b)the de broglie wavelength of a certain atomic nucleus moving at a speed of 1.0% of the speed of light is 3.3 x 10a-14 m. what is the atomic mass of the nucleus? c)a radioactive sample contains 10^18 atoms of isotope x. if, after 5 hours, 10 17 atoms of x remain, what is the half life of isotope x? d)a sample of fluorine-18 undergoes beta-plus decay into oxygen-18 with a half-life of 110 minutes. after how many hours will the original number of fluorine-18 nuclei have reduced to roughly 10a-6 of its original value?
Solved
Show answers
More tips
- H Health and Medicine Discover the Hidden Principles and Real Results of the Japanese Diet...
- C Computers and Internet Google Search Tips and Tricks: Everything You Need to Know...
- F Food and Cooking Experts Name Top 5 Healthiest Teas...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- F Food and Cooking How many stages of coffee roasting are there?...
- C Computers and Internet Porn Banner: What It Is and How to Get Rid Of It?...
- G Goods and services How to Choose a Coffee Maker? The Ultimate Guide for Coffee Lovers...
- C Computers and Internet How to Teach Older Generations to Work with Computers?...
- P Philosophy Unidentified Flying Object - What is the Nature of this Phenomenon?...
- H Health and Medicine Boosting Immunity: A Complete Guide on How to Improve Your Body’s Natural Defenses...
Answers on questions: Physics
- P Physics Describe the methods by which an electric potential develops in generators and thermocouples....
- P Physics How many independent variables does a good investigator use in his or her experiment?...
- P Physics What is the initial velocity of the object represented bythe graph...
- P Physics Calculate the velocity if a car traveled 4000 meters, and did it in 400 seconds. (v = d / t)...
- P Physics Is this right? Please help...
- P Physics What is the electric force acting between two charges of -0.0080 C and 0.0050 C that are 0.035 m apart? Use F. - k9;92 and k = 9.00 x 109 N•m2/C2 A. -2.9 x 108 N B....
- P Physics How many licks does it take to get to the caramel center of a tootsie roll tootsie pop?...
- M Mathematics Please answer correctly, will mark brainliest worth 30pts...
- H History In order to make raising cotton a more profitable industry, Alabama s leaders encouraged the making of cottoninto cloth right here in the state.True or False...
- B Biology - Phylogeny is the study of how the first ribonucleic acid (RNA) strands in Earth s primordial soup developed into humans and other animals. As these animals evolved...
Ответ:
506.1 m/s
Explanation:
Let the initial velocity of cannonball be 'u' and final common velocity after collision be 'u₁'.
Given:
Mass of the cannonball (m) = 50 kg
Mass of the war tank (M) = 12,000 kg
Initial velocity of the tank (U) = 0 m/s
Distance moved by the system after collision (d) = 50 cm = 0.50 m
Coefficient of friction (μ) = 0.450
At the time of collision, momentum is conserved. So,
Initial momentum = Final momentum
Now, as the system moves along the rough surface, the system eventually stops after traveling a certain distance.
The acceleration due to friction is given as:
The negative sign implies that acceleration is acting to reduce the velocity.
Now applying the following equation of motion, we have:
Now, solving for 'u', we get:
Therefore, the initial velocity of the cannonball was 506.1 m/s.