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Physics Exam Study
| Question | Answer |
|---|---|
| If an object travels 1500 m in 50 s, then what is its average velocity? | 30 m/s |
| Average speed is calculated by dividing distance traveled by time. How is average velocity calculated? | displacement divided by time. |
| If an object's recorded motion on a number line moved from x=12m to x =124 m and back to x=98 m and the total time interval for this motion was 10 s, then what was the object's average velocity? | 8.6 m/s |
| If you walk straight and cover 10 m in 4 min, then stop there 1 min and walk back to your starting point in 5 min, then which of the following represents the shape of the position vs. time graph? | A straight line inclined to the time axis sloping up for 4 min, then a straight line parallel to time axis for 1 min, and then a straight line inclined to the time axis sloping down |
| A toy car moves 8 m in 4 s at the constant velocity. What is the car's velocity? | 2 m/s |
| If a car slowed from 26 m/s to 18 m/s in a period of 4.0 s, what was the average acceleration? | -2.0m/s squared |
| If an automobile slows from 50 m/s to 25 m/s in a period of 5 s, what was the average acceleration? | -5 m/s squared |
| The velocity of a car increases from 2.0 m/s to 16 m/s in a time period of 3.5 s. What is the car's average acceleration? | 4.0m/s squared |
| A car is moving about a circular track of radius 25 m with a speed of 30 m/s. what is the centripetal acceleration of the car? | 36 m/sec.sq |
| Acceleration always refers to a | change in velocity. |
| The amount of force needed to keep a 0.2 kg hockey puck moving at a constant speed of 8 m/s on friction less ice is ___ N | 0 N |
| The amount of force needed to keep a 0.5kg baseball moving at a constant speed of 4 m/s on frictionless ice is | 0 N |
| What is Newton's first law of motion also known as? | law of inertia |
| Without an unbalanced force acting on it, a moving object will | keep going with constant speed in the same direction. |
| When hit from behind in a car crash, a passenger wearing a seat belt can suffer a neck injury. Which of Newton's laws does this exemplify? | first law of motion |
| If a 82 kg person is in an elevator moving at a speed of 5 m/s, then what is the person's kinetic energy? | 1,025 J |
| What two variables does kinetic energy depend on? | mass and velocity |
| Two blocks of different masses are raised to a certain height, which block will have more potential energy? | Block with more mass |
| Potential energy is given by | mgh |
| Potential energy is measured using the unit | Joule |
| If the velocity of an airplane is doubled, then its kinetic energy will increase by a factor of _____. | 4 |
| A 0.5 kg ball is at the top of a ramp which is 8 meters high. How much kinetic energy does the ball have at the bottom of the ramp? | 40 J |
| Energy is... | The ability to do work |
| The first law of thermodynamics is also known as? | conservation of energy |
| Second law of thermodynamics defines | Entropy |
| Which law of thermodynamics help in calculating entropy at different temperatures? | Third law |
| What are the three types of mechanical waves? | transverse, longitudinal, and surface waves |
| Roads can be bent or broken far away from an earthquake's center. This shows that earthquake waves: | Transfer energy over a distance |
| A sound wave produced by a chime 515 m away is heard 1.50 s later. What is the speed of the sound in air? | 343 m/s |
| The frequency of a sound wave is 457 Hz. What is the period? | 0.0022 s |
| The peak of a transverse wave is called the... | crest |
| A parallel circuit resonance is used for magnifying? | voltage |
| What factor decides the resistivity of the conductor? | material used |
| Types of circuits are | Series and Parallel circuit |
| Organization of elements for the storage, transmission and conversion of energy is known as | Electrical circuit |
| In parallel connection all the components will have similar | Potential difference |
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