Mathematics and Physical Science Department Name: Student # Score: Rye Alfonso PHYSICS 103 LECTURE Recitation Activity #2 ANSWER KEY Chapter 2: MOTION in One-Dimension, VECTORS DIRECTION: Please show complete solutions and box all final answers. Write the answer up to two decimal places. ☺ 1. Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces , and given in the figure below. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zero. (5 points) Let be the fourth vector ,

Given that We have

Ax =+A cos 30° =100 cos 30°= +86.60 N Bx =-B sin 30° = -80 sin 30° = -40.00 N

Cx =-C cos 53°=- 40 cos 53° = -24.07 N
Dx= -(Ax+Bx+Cx)=-22.53 N (1 point) (1 point)

Ay =+A sin 30°=100 sin 30°= +50.00 N By =+B cos 30°=80 cos 30° = +69.28 N Cy =-C sin 53°= -40 sin 53°= -31.95 N Dy= -(Ay+By+Cy)=-87.33 N (1 point)

θ
counterclockwise from the – x- axis or S of W Or

α

counterclockwise from the + x- axis (2 points)

2. You are on the roof of the physics building, 46.0 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1.20 m/s. If you wish to drop an egg on your professor’s head, where should the professor be when you release the egg? Assume that the egg is in free fall. (5 points)

BONUS: (3 points) Ranking Task: D. Maloney, Physics Ranking Tasks Pictured below are six waterfalls all of which have the same amount of water flowing over them. The waterfalls differ in height and in the speed of the water as it goes over the edge. The specific values of the heights and speeds are given in the figures. Rank these situations from longest to shortest based on how long it takes the water to go from the top of the falls to the bottom. That is, put first the situation where it takes the water the most time to go from the top of the falls to the bottom, and put last the one that takes the least time....

...
Daily Use of Physics
Jason L. McDuffy
University of Memphis
Physics 1 (online)
Project 1
Daily Use of PhysicsPhysics is considered to be a powerful lens that helps people view the everyday world. Physics is reflected in the everyday phenomena, puzzles and toys that offer a variety of interesting challenges leading to deep and interesting problems that derive from science and...

...Christopher Gooden
Dr. Jan Yarrison-Rice
Physics 101
5 April 2005
Physics in Sports
When many people think of sports, the topic of physics doesn't always come to mind. They usually don't think about connecting athletics with academics. In reality math, science, and especially physics, tie into every aspect of sports. Sports are a commonality that brings nations together, Soccer, known as football to most of the world, is said to an...

...Science in the Big City:
Exploring Career Opportunities in the Natural and Physical Sciences
New York City
May 13-18, 2014
Students in the Natural Sciences at the University of Houston-Downtown are generally accomplished and motivated students with strong interests in science. However, students typically have a very limited perception of the science careers available to them outside of medicine. To educate students as to the array of potential careers available in the sciences (not...

...Physics began when man first started to study his surroundings. Early applications of physics include the invention of the wheel and of primitive weapons. The people who built Stone Henge had knowledge of physical mechanics in order to move the rocks and place them on top of each other. It was not until during the period of Greek culture that the first systematic treatment of physics started with the use of mechanics. Thales is often said to have been...

...Cosmology
By: Jarrett Leuta-Douyere
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Growing up in a family filled with athletic desire to be great at whatever sport we would participate in and understanding simple physics in Cosmetology, I never realized how much physics comes into play when playing sports. We don’t call it physics when were playing, football, basketball, baseball because it’s just a natural feeling when were throwing a ball or trying to tackle...

...Physics End of Year Reflection Paper
At the beginning of this course you were given some overarching enduring understandings and essential questions. These were:
Overarching Enduring Understandings:
Students will uncover and use appropriate scientific models to describe and quantify the nature and interactions of matter and energy.
Students should understand that there is a network of rules and relationships that determine what will happen in a given...

...Student Exploration: Fan Cart Physics
Vocabulary: acceleration, force, friction, mass, newton, Newton’s first law, Newton’s second law, Newton’s third law, velocity
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Imagine a horse pulling a cart. What would happen to the speed of the cart if several bags of cement were added to the cart? The speed of the cart would decrease.
2. Suppose several more horses were hitched up to the same cart. How would...

...gives rise
Joseph Henry (1830) discovered the reverse effect, the production of an electric potential
Maxwell, ( c.1856,) developed ideas mathematically in his theory of electromagnetic radiation.
Birth of Modern Physics
( late 19th cent. ) most of classical physics was complete,
Wilhelm Roentgen (1895) the discoveries of X rays
radioactivity by A. H. Becquerel (1896),
the electron by J. J. Thomson (1897), and
Ernest Rutherford 1911...

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