Hey! I see you found my physics tests page. All these tests are 2nd semester only! However the only difference from these tests and the ones you'll be taking in regular Physics next year is that the numbers will be different (that is all). I also would put the answers with the questions but i didn't do too well on any of the tests, but i did get some answers sooo... if you need an answer to some question I just might have it (e-mail me the question, and the test number) so! enjoy!
Physics
Ch. 7 Test 1
Instructions:
1. You may use one 8 1/2" x 11" page of your own notes (turn in with test)
2. One calculator per student (no sharing)
3. Show all work below each question as is applicable (no work will result in a loss of points)
4. Show proper units in both your work & answers.
5. Place answer in the space provided.
6. Be neat!
It takes 6 hours for a 100kg man to climb a 1,000m high mountain.
1) How much usable work (gravitational P.E.) did this man create as he climbed the mountain?
2) What was the man's average power output as he climbed the mountain?
3) If the man's body is only 30% effcient as he climbs then how much stored chemical energy did he use as he climbed the mountain?
A 5,000kg truck traveling on a slick road at 20 m/s must slow down rapidly due to traffic. The truck driver over reacts & as a result the truck slows down by skidding 40m. There is a .1 coefficient of friction in effect during this panic braking. (Note...the truck does not stop)
4) How much K.E. does the truck have just before braking?
5) How much work is done by friction (K.E. lost) during the skidding?
6) How fast is the truck traveling at immediately after the skidding?
Physics
Ch. 7 Test 2
A forensics officer must determine how fast a 4,500kg truck was traveling at when at when it rear ended a stationary 1,500kg car. As a result of collision the car & truck become locked together. Skid marks indicate that after the collision the car & truck skid to a stop in 20m. Lab measurements indicate that a .6 coefficient of friction was in effect during the skidding.
1) How much K.E. did the car & truck lose to friction as they skid to a stop after the collision?
2) How fast were the car & truck moving at immediately after the collision but before the skidding?
3) How fast was the truck traveling at just before it rear ended the car?
A small hydroelectric power plant produces 800kW of electrical power 24 hours a day by having water flow through it "down" 100m. The plant is 70% efficient at converting the P.E. of the water into electrical energy. 20% of the water's P.E. becomes the water's K.E. as it exits the dam & 10% of the water's P.E. is "lost" to friction.
4) How much electrical energy is being produced each day?
5) How much P.E. of water must be used each day?
6) How much water must "fall" though the dam each day?
7) How fast is the water going to exit the dam at?
Physics
Ch. 7 Test 3A
A 5,000kg truck has a head on collision with a 1,000kg car. Both the truck & the car were moving at 10 m/s just before the head on collision. As a result of the collision the truck & car become locked together. Immediately after the collision the "locked together" truck & car skid to a stop in a distance of 20m.
1) How fast were the truck and car moving at immediately after the collision but before the skidding?
2) How much K.E. did the car & truck lose to friction as they skid to a stop after the collision?
3) What coefficient of friction was in effect between the tires & the road as the truck & car skid to a stop?
Physics
Ch. 7 Test 3B
A motor that operates on 500W of electric power is used to run a grain elevator. The elevator can lift 6,000kg of grain up a distance of 20m each hour.
1) How much electrical energy is used by the motor if the elevator is in operation continuously for one week?
2) How much useful work (lifting) can be done in one week by the motor & elevator?
3) How efficient is this electrical motor & elevator system?
A .4kg football is located 1m above the ground when it is kicked by a punter. The ball receives an intial speed of 20 m/s upon being kicked. When the ball reaches it's highest point in it's flight path it is still traveling 10 m/s.
4) How far above the ground is the football when the ball reaches it's highest point in it's flight path?
Physics
Ch. 8 Test I
A 3.5°C 200kg slab of sand stone falls from rest 300m into a 3.5°C 800kg pool of pure water. Sand Stone is simply sand that is "glued" together & at 3.5°C 1.000kg of pure water occupies exactly 1.000 liter of volume.
1) How much K.E. does the sand stone have (as a result of falling) just before it hits the water?
2) If upon impact 80% of the sand stone's K.E. is converted into thermal energy then what will be the final temperature of the sand stone & the water?
3) How much volume would you expect the "slighty heated" 800kg of water to occupy as a result of the sand stone falling into the water? (Ignore water that might splash out of the pool.)
Operating your air conditioner at a higher thermostat setting on hot summer days can save you lots of money.
4) If it costs $200/month just for the electricity to keep your home cooled at 20°C, when the average outside temperature is 30°C, the how much can you save per month be resetting the thermostat at 24°C?
A 40g piece of Al pipe that has been heated to 150°C is measured & found to be exactly 12.000cm long. The pipe is then placed into 100g of "cold" water. After the pipe & water reach thermal equilibrium their final temperature is only 30°C.
5) How long will the pipe be after it is cooled to 30°C?
6) How much heat does the pipe lose to the water as it cools down?
7) What was the intial temperature of the "cold" water?
Physics
Ch. 8 Test II
An electric hot plate that produces 500W of heating power is used to convert 200g of ice at -30°C to water at 40°C.
1) How much heat is required to convert 200g of ice at -30°C to water at 40°C?
2) How long will the hot plate have to be on in order to convert the 200g of ice at -30°C to water at 40°C?
A 100kg ice skater skids to a stop on a 0° ice covered pond. As a result of friction during stopping, 15g of ice is melted.
3) How much frictional heat is needed to melt the 15g of ice?
4) How fast was the ice skater traveling at before slowing to a stop if all of the ice skaters K.E. is converted into friction?
A 25g cube of 0°C ice is dropped into 50g copper cup that contains 100g of 60°C water.
5) What will the final equilibrium temperature of the water (the melted ice as well as the original liquid water) & the cup?
100g of -20°C ice is heated with 3.2x10^5 J of energy. This results in 100g of stream being created.
6) How much of the 3.2x10^5 J of heat is needed to convert the 100g of -20°C ice into 100°C steam?
7) What would be the final temperature of the steam if all 3.2x10^5 J of heat energy is used to convert -20°C ice into steam? (Hint...the final temperature of the steam will be more than 100°C.)
Physics
Ch. 10 Test
An ocean wave that has a .2Hz fequency rolls in from a deep sea at 20m/s. As a wave reaches a shallow bay it slows down such that it only has a wavelength of 40m.
1) What is the period of this wave?
2) what is the length of this wave as it rolls through the deep sea?
3) What is the speed of this wave as it moves through the shallow bay?
A series of waves is being generated in a rope such that they reflect back on themselves & this creates a series of standing waves that have a period of .4s & distance of .6m between each node.
4) With what speed is the series of waves actually traveling through the rope at?
A bat emits a high frequency squeak in order to locate a moth. The sound wave that is emitted has a wave length of .5cm & travels at 350m/s.
5) At what frequency did the bat squeak?
6) If the bat hears the echo of it's squeak after just .02s then how far away is the moth?
Disclaimer: I am not responsible for you (if you do) get in trouble for these tests I have posted on my web site. They are to be used as a study aid and nothing more. They are samples of what the real things are. and I would not recommend printing this page out. But you do in fact have free will, so I cannot stop you. Thank you for your time. -Alexis Garcia