|
|
|
| Other
|
| Math
|
| Biology
|
| Business
|
| Chemistry
|
| Economics
|
| Essay Service
|
| History
|
| Language
|
| Physics
|
| z Medical Questions
|
|
|
|
 |
| Post
Answer |
1. In which of the following units is acceleration expressed?
A. Newtons
B. Foot-pounds
C. Kilograms
D. Meters per second squared
2. A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge?
A. 1,254.4 meters
B. 313.6 meters
C. 78.4 meters
D. 39.2 meters
3. A tank with a flat bottom is filled with water to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)
A. 4.0 kPa
B. 9.8 kPa
C. 18.9 kPa
D. 39.2 kPa
4. The ability of a material to transfer heat or electric current is called
A. insulation.
B. porosity.
C. conductivity.
D. convection.
5. A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?
A. 5,362.56 N
B. 6,150.64 N
C. 6,700.56 N
D. 7,600.18 N
6. When an automotive battery is fully charged, the sulfuric acid and water mixture will have a specific gravity of about
A. 0.15.
B. 1.0.
C. 1.3.
D. 2.5.
7. If an object has a mass of 20 kg, what is the force of gravity acting on it on earth?
A. 196 N
B. 2.04 kg
C. 32.67 N
D. 1.96 kg
8. If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be
A. lower than the mercury in the vessel, and shaped like the outside of an umbrella.
B. higher than the mercury in the vessel, and shaped like the outside of an umbrella.
C. lower than the mercury in the vessel, and shaped like the inside of a bowl.
D. higher than the mercury in the vessel, and shaped like the inside of a bowl.
9. 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. 8.75 hours
B. 9 hours
C. 10.5 hours
D. 11 hours
10. A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?
A. 92 percent
B. 94 percent
C. 96 percent
D. 97 percent
11. What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?
A. 2,940 J
B. 5,880 J
C. 6,000 J
D. 12,000 J
12. If a gas has a gage pressure of 156 kPa, its absolute pressure is approximately
A. 56 kPa.
B. 100 kPa
C. 256 kPa.
D. 300 kPa.
13. According to Ptolemy\'s model of the movement of celestial bodies,
A. the earth rotates around the sun.
B. the sun is the center of the universe.
C. the earth rotates around the moon.
D. planets orbit in circular paths around the earth.
14. A car with a mass of 1,200 kilograms is moving around a circular curve at a uniform velocity of 20 meters per second. The centripetal force on the car is 6,000 newtons. What is the radius of the curve?
A. 160 meters
B. 80 meters
C. 32 meters
D. 16 meters
15. What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?
A. 1.875 kg
B. 23 kg
C. 23 N
D. 120 N
16. Oil flows upward in the wick of a lantern because of the liquid property called
A. viscosity.
B. capillarity.
C. meniscusity.
D. density.
17. 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. 4 km/hour
B. 36 km/hour
C. 60 km/hour
D. 960 km/hour
18. Which of the following is the term used to describe a body\'s resistance to a change in motion?
A. Inertia
B. Acceleration
C. Gravity
D. Mass
19. If the velocity of an object changes from 65 m/s to 98 m/s during a time interval of 12 s, what is the acceleration of the object?
A. 2.75 m/s
B. 5.42 m/s
C. 13.58 m/s
D. 33 m/s
20. An object has a mass of 120 kg on the moon. What is the force of gravity acting on the object on the moon?
A. 12.24 N
B. 20 N
C. 196 N
D. 1,176 N
21. In a practical machine, the power output is _______ the power input.
A. smaller than
B. larger than
C. equal to
D. multiplied by
22. If a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground, what is the final velocity of the stone?
A. 39.2 m/s
B. 42.6 m/s
C. 78.4 m/s
D. 156.8 m/s
23. The ratio of output power to input power, in percent, is called
A. conductivity.
B. efficiency.
C. work.
D. horsepower.
24. An object with a mass of 78 kilograms is lifted through a height of 6 meters. How much work is done?
A. 47.75 J
B. 468 J
C. 764.4 J
D. 4,586.4 J
25. A car with a mass of 2,000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters. What is the centripetal force on the car?
A. 625 N
B. 703 N
C. 15,625 N
D. 20,250 N
|
| Answer |
Solutions in the attached file. |
| Amount
of $ Requested |
$
10.00 |
|
|
|
