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For the system to do 2000 J work, 2500 J of heat must be added to it. Calculate
the possible changes in the internal energy of the system.
Maria throws a ball straight up with an initial velocity of 10 m/s. What is its velocity when it returned to the elevation from where it was thrown? Please explain your answer.
a 200Nforce is applied to side A to pull it down a vertical distance of 1m determine the magnitude of the force produced on the box on side B if side B moves up a vertical distance of .5m
Find the intensity of an 89 dB sound. What happens to this intensity if you move 4 times the distance away (actually need a value)? What is the dB reading of this new intensity?
Miss Takken heats a 300 g piece of iron to a temperature of 500 degrees Celsius and then plunges it into a vat of 30 L of water at 5 degrees Celsius. What is the final temperature of the system?
Alex, Alex, and Cody are swimming on a balmy 26°C day in water where the speed of sound is 1400 m/s. They have not handed in their labs so Miss Takken sounds like a foghorn to get their attention. They hear the sound underwater first and hear the sound again in the air 3 seconds later. How far away is Miss Takken from the students?
Miss Takken throws a 10 g ball upwards at an initial speed of 4.5 m/s while standing on a 37 m high cliff.
a. What maximum height will the ball reach above the ground?
b. What will the ball’s height be when it is traveling at 5.6 m/s?
c. What will the ball’s potential energy be just before impact?
d. What will the ball’s speed be just before impact?
The entire physics class does not submit their physics labs and Miss Takken is really angry! And when Miss Takken gets angry she gets even. So Miss Takken locks the class in a cage and walks 350 m away with her cannon. She fires a cannonball at an angle of 34° above the horizontal and with a velocity of 60.0 m/s. (Not based on a true story!)
a. Is the class toast or safe?
b. Mr. Lacey gets in on the act and tells Miss Takken that she can adjust the cannon to another angle to hit the class. What angle does Mr. Lacey tell her to adjust it to?
c. Describe two other methods that Miss Takken might employ to nail the class besides adjusting the angle.
Miss Takken is cruising along at 4 m/s (in her cool FizzX car) when a physics student
(who did not hand in their lab) passes her in a pickup truck going at a speed of 13 m/s.
If Miss Takken can accelerate at 2.5 m/s2
a. How long will it take Miss Takken to catch this student?
b. At what distance from the initial pass will she catch them?
c. How fast will Miss Takken be going when she catches the student?
What is the speed of a water wave of frequency 2 Hz and wavelength 1.5 m?
