University:
Borough of Manhattan Community College
Course:
PHY 110 | General Physics
Academic year:

2024
Views:

250

Pages:

2
Author:

Anastasiya S.

Physics 110 Homework #1 (23 points) (for full credit you must answer all questions and show calculations when there is a "show calculation" box) Match the following phenomena with the subfield of physics that would study them: a. rainbows - k. optics b. an electron moving in a hydrogen atom - m. atomic physics c. lightning - k. electricity and magnetism d. adding cold milk to hot coffee - j. thermodynamics e. bat hitting a baseball - i. mechanics What are the stages in the scientific method? a. Observe a phenomenon b. Generalize the observation and deduce rules c. Develop a theory to explain the rules d. Observe more phenomena to test the theory e. All of the above Match the following physical quantities with their standard units in the metric system: a. time - j. seconds b. speed - k. meters/seconds c. distance - i. meters d. velocity - k. meters/seconds e. acceleration - j. meters/seconds² Which of the following is a conversion factor that relates miles (mi) and kilometers (km): c. 1km = 1.609mi Physics 110 Homework #1 (Continued) Speed is: b. How fast an object is moving and the direction Velocity is: b. How fast an object is moving and the direction Acceleration is: d. The rate of change of the velocity An object is accelerating if: d. All of the above If an object has a constant acceleration of 5m/s², this means: b. The velocity is changing by 5m/s every second Physics 110 Homework #4 (Continued) In the distance versus time graphs shown, which of the following is true? c. Moving to the right in graph 1, moving to the left in graph 2, not moving in graph 3 In the velocity versus time graphs shown, which of the following is true? b. Speeding up in graph 1, slowing down in graph 2, moving at constant speed in graph 3 Physics 110 Homework #4 (Continued) Convert 30 kilometers to miles: b. 18.6 miles A man runs 30 meters in 6 seconds. What was his average speed? b. 5 m/s What distance would a hiker travel if they walk at an average speed of 6 kilometers/hour for 3 hours? d. 18 kilometers What time would it take a plane moving at 500 kilometers/hour to travel 4000 miles? d. 12.9 hours A car speeds up from 0 to 20m/s in 4 seconds. What was the acceleration? a. 5 m/s² Calculations: Question 12: 30 km * 0.621 mi/km = 18.6 miles Question 13: Speed = distance/time = 30 m / 6 s = 5 m/s Question 14: Distance = speed * time = (6 km/h) * (3 h) = 18 km Question 15: 4000 miles * 1.609 km/mi = 6441 km, time = distance/speed = 6441 km / 500 km/h = 12.9 hours Question 16: Acceleration = (final velocity - initial velocity) / time = (20 m/s - 0 m/s) / 4 s = 5 m/s² Physics 110 Homework #4 (Continued) A truck slows down from 40m/s to 30m/s in 5 seconds. What was the acceleration? d. -2m/s² Calculation: Acceleration = (final velocity - initial velocity) / time = (30 m/s - 40 m/s) / 5 s = -10 m/s / 5 s = -2 m/s²