The orbits of planets being elliptical was one the planetary laws developed by
==A. Kepler.
B. Brahe.
C. Ptolemy.
D. Copernicus.
If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the total time of the trip can allow you to calculate
==A. instantaneous velocity.
B. deceleration.
C. uniform velocity.
D. average velocity.
Your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operation. You have four options, and your boss reminds you to be as cost-efficient as possible but that she also wants the best efficiency. Which is your best option?
Option 1: This $5,000 machine is supplied energy at a rate of 1,900 W and does useful work at a rate of 1,786 W.
Option 2: This $4,500 machine is supplied energy at a rate of 1,450 W and does useful work at a rate of 1,300 W.
Option 3: This $4,750 machine is supplied energy at a rate of 1950 W and does useful work at a rate of 1833 W.
Option 4: This $4,750 machine is supplied energy at a rate of 2,000 W and does useful work at a rate of 1,822 W.
A. Option 2
B. Option 1
==C. Option 4
D. Option 3
If a total force exerted by water in a container with a bottom area of 2 square meters is 450 newtons, what's the water pressure at the bottom of the container?
A. 0.900 kPa
==B. 0.225 kPa
C. 0.300 kPa
D. 0.575 kPa
The main difference between speed and velocity involves
A. gravity.
=B. direction.
C. distance.
D. weight.
A block has a volume of 0.07 m3 and a density of 3,500 kg/m3. What's the force of gravity acting on the block (and weight) in the air?
A. 686 N
B. 2,058 N
C. 1,715 N
==D. 2,401 N
According to Ptolemy's model of the movement of celestial bodies,
A. the earth rotates around the moon.
B. the earth rotates around the sun.
C. the sun is the center of the universe.
==D. planets orbit in circular paths around the earth.
A package was determined to have a mass of 5.7 kilograms. What's the force of gravity acting on the package on earth?
A. 1.72 N
B. 37.93 N
==C. 55.86 N
D. 13.44 N
A car travels from Boston to Hartford in 4 hours. The two cities are 240 kilometers apart. What was the average speed of the car during the trip?
==A. 60 km/hour
B. 960 km/hour
C. 4 km/hour
D. 36 km/hour
A company is interested in buying a new machine to replace their outdated equipment. However, before committing to the purchase, the company asks the manufacturer to provide data on a certain machine's efficiency. The data suggests that with a supplied energy at a rate of 1,600 W, the machine will do useful work at a rate of 1,540 W. What's the efficiency of this particular machine?
A. 77.00%
B. 103.90%
C. 84.21%
== D. 96.25%
If the centripetal and thus frictional force between the tires and the roadbed of a car moving in a circular path were reduced, what would happen?
A. The car would slow down.
B. The car would continue to move in the circular path.
==C. The car would begin to move in the direction it was headed in a straight line.
D. The car would stop moving instantly.
If an object has a mass of 20 kg, what is the force of gravity acting on it on earth?
A. 32.67 N
==B. 1.96 kg
C. 196 N
D. 2.04 kg
In a practical machine, the power output is smaller than the power input. Considering the law of energy conservation, what can explain this occurrence?
==A. Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat.
B. Some of the energy coming out of the machine is being destroyed.
C. Some of the energy going into the machine is being destroyed.
D. Some of the energy going into the machine is being created at a quicker rate than the energy coming out is being destroyed.
When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of about
==A. 1.3.
B. 2.5.
C. 1.0.
D. 0.15.
Suppose that a block is pulled 16 meters across a floor. What amount of work is done if the force used to drag the block is 22 N?
==A. 352 J
B. 200 J
C. 330 J
D. 220 J
Imagine that a tank is filled with water. The height of the liquid column is 7 meters and the area is 1.5 square meters (m2). What's the force of gravity acting on the column of water?
A. 68,600 N
B. 110,700 N
C. 73,500 N
==D. 102,900 N
Which one of the following accurately pairs the device with its function?
==A. Bourdon gage—indicate steam pressure in a furnace
B. manometer—check batteries
C. Bourdon gage—move pistons to create a system of constant pressure
D. manometer—determine the specific gravity of a liquid
A force of 350 N causes a body to move with an acceleration of 10 m/s2. What's the mass of the body?
== A. 35 kg
B. 3,430 kg
C. 98 kg
D. 3,500 kg
How much time should be allowed for a 605-mile car trip if the car will be traveling at an average speed of 55 miles per hour?
A. 9 hours
B. 10.5 hours
C. 8.75 hours
==D. 11 hours
What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?
==A. 120 N
B. 1.875 kg
C. 23 N
D. 23 kg
_
What's the value of 57,281 joules in Btu?
A. 14.2 Btu
B. 37.7 Btu
C. 28.9 Btu
== D. 54.3 Btu
The process in which a substance changes from a gaseous state to the liquid state is
A. critical temperature.
B. evaporation.
C. absolute zero.
== D. condensation.
The transmission of heat requiring the movement of a liquid or a gas is
A. radiation.
==B. convection.
C. conduction.
D. transduction.
A quantity of gas has a volume of 0.20 m3 and an absolute temperature of 333 K. When the temperature of the gas is raised to 533 K, what is the new volume of the gas? (Assume there's no change in pressure).
A. 0.0006 m3
==B. 0.3201 m3
C. 0.2146 m3
D. 0.2333 m3
The main difference between the internal combustion engine and the diesel engine is that the diesel engine
A. has no connecting rods.
B. does not have a crankshaft.
C. does not utilize pistons.
==D. has no ignition system.
In order for combustion to occur, what needs to happen?
A. Oxygen is removed from the area.
= =B. A fuel sits in the presence of a small amount of oxygen.
C. The ignition point for a given fuel is met.
D. The temperature of the fuel is lowered.
How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
==A. 1,314,718 J
B. 6,573 J
C. 4,187,000 J
D. 314 J
Which one of the following temperatures is equal to 5°C?
A. 41 K
B. 0 K
C. 465 K
== D. 278 K
If a substance forms crystals when it solidifies, its _______ points are the same.
= =A. melting and freezing
B. evaporation and freezing
C. melting and condensation
D. evaporation and condensation
Convert the temperature 288 K to degrees Celsius.
==A. 15°C
B. 748°C
C. 561°C
D. –172°C
A temperature of 200°F is equivalent to approximately
==A. 93.3°C.
B. 37.8°C.
C. 232°C.
D. 840°C.
Liquid alcohol will change to vapor when its temperature reaches the _______ point.
A. melting
B. freezing
C. fusing
==D. boiling
What is the temperature 32 degrees Fahrenheit in degrees Celsius?
A. 10°C
B. 20°C
C. –10°C
==D. 0°C
Which of the following is not a requirement of a practical fuel?
==A. It must be in the solid state to be used.
B. It must be made up of elements that combine easily with oxygen.
C. It must occur in abundance in nature or be easy to produce.
D. It must contain a large amount of stored energy.
If the absolute pressure of a gas is 550.280 kPa, its gauge pressure is
A. 277.280 kPa.
B. 101.325 kPa.
C. 651.605 kPa.
==D. 448.955 kPa.
What's the value of 1,152 Btu in joules?
A. 987,875 J
B. 1,964,445 J
==C. 1,215,360 J
D. 2,485,664 J
When heating water, during what temperature range will the temperature cease to change for some time?
==A. 98°C–102°C
B. 84°C–88°C
C. 32°C–43°C
D. 54°C–62°C
Which one of the following indicates a drop in temperature?
A. The column of liquid in a thermometer moves up three degrees.
B. The brass on a bent bimetallic strip is on the outside curve.
==C. A bimetallic strip bends so that the steel is on the outside curve.
D. The alcohol in a thermometer expands.
A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what's the new pressure of the gas? (Assume that there's no change in volume.)
A. 3.636 kPa
==B. 854.46 kPa
C. 510 kPa
D. 1.702 kPa
If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 873°C.
B. 273°C.
==C. 327°C.
D. 705°C.
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