Sunday, November 29, 2015
Thursday, November 26, 2015
Exam Review: Open-Book and Multiple-Choice
Open book exam.
You have the permission to use your textbooks and any your notes.
Moreover, sometimes you have to use your textbooks to take some table-data.
So, bring with you into the midterm exam your textbooks, worksheets and chapter summaries, calculators and your lucky pencils to fill Scantron cards.
Examples:
1. How much heat is required to rise the temperature of 10 g of aluminum from 20°C to 30°C?
(Hint: Use the table 10.1 in the page 196 to take the specific heat capacity of aluminum, c=0.215 cal/(g °C). )
2. Mercury in a flask has the volume of 10 cm³. What is the mass of this amount of mercury?
(Hint: Use table 9.1 in the page 174 to take the Mercury density, 13.6 g/cm³. )
3. A large rock is dropped from the top of a high cliff (with an initial velocity of zero). How far does it fall in the first 2 second of its flight?
Hint: Use the figure 3.7 in the page 43.
(Hint: Try to predict solutions without calculations. )
4. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 km/h, b) 40 km/h, c) 90 km/h, d) 130 km/h, e) No solution.
5. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 km/h, b) 60 km/h, c) 65 km/h, d) 60 m/s, e) 60.
(Hint: Check units of measurement. )
6. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 17 m/s, b) 40 m/s, c) 60 m/s, d) 130 km/h, e) No solution.
(Hint: Check units of measurement. )
7. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 m/s, b) 40 m/s, c) 60 m/s, d) 130 km/h, e) No solution.
(Hint: Check units of measurement. )
8. A ball is thrown upward with an initial velocity of 15 m/s. What is the magnitude of the ball’s velocity 1 second after it is thrown? Use the approximate value of g = 10 m/s².
a) 5 m/s², b) 5, c) 5 magnitudes, d) 25 m/s, e) no solution.
(Hint: Check units of measurement. )
9. Two identical objects have different speeds. The kinetic energy of the first object is 10 J. Speed of the second object is 3 times greater than the speed of the first object. What is kinetic energy of the second object?
(Hint: Do analysis of quantitative relationships between physics parameters in physics formulas: directly proportional, inversely proportional, proportional to the square, inversely proportional to the square. Don't limit your work with the formulas only by substitutions of symbols by numbers and doing calculations. )
You have the permission to use your textbooks and any your notes.
Moreover, sometimes you have to use your textbooks to take some table-data.
So, bring with you into the midterm exam your textbooks, worksheets and chapter summaries, calculators and your lucky pencils to fill Scantron cards.
Examples:
1. How much heat is required to rise the temperature of 10 g of aluminum from 20°C to 30°C?
(Hint: Use the table 10.1 in the page 196 to take the specific heat capacity of aluminum, c=0.215 cal/(g °C). )
2. Mercury in a flask has the volume of 10 cm³. What is the mass of this amount of mercury?
(Hint: Use table 9.1 in the page 174 to take the Mercury density, 13.6 g/cm³. )
3. A large rock is dropped from the top of a high cliff (with an initial velocity of zero). How far does it fall in the first 2 second of its flight?
Hint: Use the figure 3.7 in the page 43.
(Hint: Try to predict solutions without calculations. )
4. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 km/h, b) 40 km/h, c) 90 km/h, d) 130 km/h, e) No solution.
5. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 km/h, b) 60 km/h, c) 65 km/h, d) 60 m/s, e) 60.
(Hint: Check units of measurement. )
6. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 17 m/s, b) 40 m/s, c) 60 m/s, d) 130 km/h, e) No solution.
(Hint: Check units of measurement. )
7. A driver drives for 2 hours at an average speed of 50 km/h and 1 hour at an average speed of 80 km/h. What is the average speed of the driver for total 3 hour trip?
a) 30 m/s, b) 40 m/s, c) 60 m/s, d) 130 km/h, e) No solution.
(Hint: Check units of measurement. )
8. A ball is thrown upward with an initial velocity of 15 m/s. What is the magnitude of the ball’s velocity 1 second after it is thrown? Use the approximate value of g = 10 m/s².
a) 5 m/s², b) 5, c) 5 magnitudes, d) 25 m/s, e) no solution.
(Hint: Check units of measurement. )
9. Two identical objects have different speeds. The kinetic energy of the first object is 10 J. Speed of the second object is 3 times greater than the speed of the first object. What is kinetic energy of the second object?
(Hint: Do analysis of quantitative relationships between physics parameters in physics formulas: directly proportional, inversely proportional, proportional to the square, inversely proportional to the square. Don't limit your work with the formulas only by substitutions of symbols by numbers and doing calculations. )
Monday, November 9, 2015
Chapter 9. Some Problems from Homework
1) An iceberg is floating in the ocean with 10% of its volume extending above the ocean's surface. What can you say about the iceberg?
a) Its weight is less than the water it displaces.
b) It displaces only 90% of its weight in water.
c) As it melts, a smaller fraction of its volume will extend above the surface.
d) Its density is close to but smaller than the density of water.
2) An ant and an elephant are walking through the jungle. On which does the greater buoyant force act?
a) The ant.
b) The elephant.
c) The same buoyant force acts on both.
d) Neither is floating, so no buoyant force is acting at all.
3) A boat floating in a large pool is loaded with solid iron bars. The water level at the pool's edge is marked with a red line. The iron is now thrown overboard. When the water becomes calm again,
a) the red line is slightly lower than the water level.
b) the red line is slightly higher than the water level.
c) the red line is still at the water level.
4) A clown at the circus blows up a balloon with helium. This balloon will not float to the ceiling unless
a) the pressure of the helium inside the balloon is greater than the atmospheric pressure.
b) the weight of the balloon is less than the weight of the air displaced by the balloon.
c) the balloon and the helium it contains weigh less than the air displaced by the balloon.
d) the pressure of the helium inside the balloon is less than the atmospheric pressure.
5) Suppose a little bubble of air has gotten into the top of a mercury barometer. If a person uses a barometer in the usual way, the reading of atmospheric pressure will be
a) correct.
b) higher than the actual value.
c) lower than the actual value.
6) A uniform wooden plank floats in a swimming pool. The plank weighs 100 pounds, and exactly 10% of its volume is above the waterline. The maximum weight of iron which could be suspended from underneath the plank without causing the whole combination to sink to the bottom of the pool is
a) exactly 10 pounds.
b) somewhat more than 10 pounds.
c) somewhat less than 10 pounds.
d) more information is needed.
7) A block that has a density of 900 kg/m3 is placed in water (density 1000 kg/m3). The block will
a) sink to the bottom.
b) sink until it is almost, but not entirely, submerged.
c) sink until it is entirely submerged and then remain in place just below the surface.
d) sink just a little bit with most of the block above the water.
e) rest on the water with none of the block submerged.
a) Its weight is less than the water it displaces.
b) It displaces only 90% of its weight in water.
c) As it melts, a smaller fraction of its volume will extend above the surface.
d) Its density is close to but smaller than the density of water.
2) An ant and an elephant are walking through the jungle. On which does the greater buoyant force act?
a) The ant.
b) The elephant.
c) The same buoyant force acts on both.
d) Neither is floating, so no buoyant force is acting at all.
3) A boat floating in a large pool is loaded with solid iron bars. The water level at the pool's edge is marked with a red line. The iron is now thrown overboard. When the water becomes calm again,
a) the red line is slightly lower than the water level.
b) the red line is slightly higher than the water level.
c) the red line is still at the water level.
4) A clown at the circus blows up a balloon with helium. This balloon will not float to the ceiling unless
a) the pressure of the helium inside the balloon is greater than the atmospheric pressure.
b) the weight of the balloon is less than the weight of the air displaced by the balloon.
c) the balloon and the helium it contains weigh less than the air displaced by the balloon.
d) the pressure of the helium inside the balloon is less than the atmospheric pressure.
5) Suppose a little bubble of air has gotten into the top of a mercury barometer. If a person uses a barometer in the usual way, the reading of atmospheric pressure will be
a) correct.
b) higher than the actual value.
c) lower than the actual value.
6) A uniform wooden plank floats in a swimming pool. The plank weighs 100 pounds, and exactly 10% of its volume is above the waterline. The maximum weight of iron which could be suspended from underneath the plank without causing the whole combination to sink to the bottom of the pool is
a) exactly 10 pounds.
b) somewhat more than 10 pounds.
c) somewhat less than 10 pounds.
d) more information is needed.
7) A block that has a density of 900 kg/m3 is placed in water (density 1000 kg/m3). The block will
a) sink to the bottom.
b) sink until it is almost, but not entirely, submerged.
c) sink until it is entirely submerged and then remain in place just below the surface.
d) sink just a little bit with most of the block above the water.
e) rest on the water with none of the block submerged.
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