Consider reference frame R, moving downward with constant speed
i. In the spaces provided, draw arrows to indicate the direction of the velocity and the acceleration of the block in reference frame R during the interval
ii. In reference frame R:
• is the block speeding up, slowing down, or moving with constant speed? (Base your answer on the directions of the velocity and acceleration).
• is the change in kinetic energy of the block positive, negative, or zero? Explain.
iii. The work-energy theorem can be applied in any inertial frame of reference. Apply the theorem to determine whether the net work done on the block is positive, negative, or zero in reference frame R. Explain.
iv. In reference frame R, during the interval
• is the displacement (i.e., change in position) of the block upward, downward, or zero? Explain. (Base your answer on your velocity arrow in part c.i.)
• is the net force on the block upward, downward, or zero? Explain. (Base your answer on your acceleration arrow in part c.i.)
• is the work done on the block by the net force positive, negative, or zero? Explain. (Base your answer on your answers to the previous two questions.)
Make sure your result for the work done on the block by the net force is consistent with your answer to part c.iii.
Want to see the full answer?
Check out a sample textbook solutionChapter 17 Solutions
Tutorials in Introductory Physics
Additional Science Textbook Solutions
University Physics Volume 1
Applied Physics (11th Edition)
Lecture- Tutorials for Introductory Astronomy
An Introduction to Thermal Physics
Sears And Zemansky's University Physics With Modern Physics
Essential University Physics: Volume 1 (3rd Edition)
- Problem 2 A particle is moving on top of a 2-dimensional. plane with its coordinates given in cartesian system as x(t) = a sin wt, y(t) = a cos wt. Express the motion of the particle in terms of polar coordinates (p, ø). What is the minimum number of generalised coordinates required to describe. its motion? Draw the. trajectory of the particle. Now if the particle trajectory is changed to the followings, repeat the exercise. x(t) = 2a sin wt, y(t) = a cos 2wtarrow_forwardI Review Newton's law of gravity and Coulomb's law are both inverse-square laws. Consequently, there should be a "Gauss's law for gravity." Part A The electric field was defined as E = Fon g/g, and we used this to find the electric field of a point charge. Using analogous reasoning, what is the gravitational field g of a point mass? Write your answer using the unit vector r, but be careful with signs; the gravitational force between two "like masses" is attractive, not repulsive. Express your answer in terms of the variables M, r, unit vector î, and the gravitational constant G. Use the 'unit vector' button to denote unit vectors in your answer. • View Available Hint(s)arrow_forwardThe block's displacement (or change in position) in reference frame R during the period AL * is either upward, downward, or equal to zero? Explain. (Use the velocity arrow from section c.i. to guide your response.) Does the block have an upward, downward, or no net force? Explain. Use the acceleration arrow from section c.i. to help you answer this question: Is the net force doing more work on the block than it is taking off? Explain. Based on your responses to the preceding two questions, how would you answer this question? Test to see whether you've answered section c.iii correctly in terms of net force work done on the block.arrow_forward
- For part A (and B i guess) what is the starting equation. Like how did you get uI1I2/(2pi r)?arrow_forwardA plane leaves Seattle, flies 85.0 mimi at 20.0 ∘∘ north of east, and then changes direction to 51.0 ∘∘ south of east. After flying at 125 mimi in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches a rescue crew. A.) In what direction should the crew fly to go directly to the field? Use components to solve this problem. B.) How far should the crew fly to go directly to the field? Use components to solve this problem.arrow_forwardAn experimentalist in a laboratory finds that a particle has a helical path. The position of this particle in the laboratory frame is given by r(t)=Rcost+Rsint+vztk where R, vz, and are constants. A moving frame has velocity (vM)L=vzk relative to the laboratory frame. a. What is the path of the particle in the moving frame? b. What is the velocity of the particle as a function of time relative to the moving frame? c. What is the acceleration of the particle in each frame? d. How should the acceleration in each frame be related? Does your answer to part (c) make sense? Explain.arrow_forward
- Quick description In this lab you will study two-dimensional motion, specifically projectile motion. You will roll a ball down an inclined plane (a track with one end propped). The ball will fly off the end of the inclined plane and undergo projectile motion until it hits the ground. At the moment the ball is leaving the inclined plane, a photogate detector measures the time the ball takes to pass through the gate. Using the diameter f the ball and the photogate time, you can calculate the speed of the ball when it passed through the photogate. Based on the angle of the inclined plane, the initial speed for the projectile motion, and the distance the ball falls (Ay in figure), you should be able to predict the horizontal distance (Ax in figure) and compare it to your measured horizontal distance. 41cm Ball 121cm Inced Plane Table Inclined plane angle = sin ^-1 (41cm/121 cm) = 19.81° Ball diameter = 0.013 m Delta Y= 76 cm=0.76 m Time (s) Velocity (m/s) Delta X (m) 0.00707 0.184 0.654…arrow_forwardAlong a straight road, two cars are found exactly next to each other at a specific instance in time. As shown below, at that moment, one car is moving with constant speed 2vo, while the other has an instantaneous speed vo and accelerates at a constant rate a. Work in the reference 1. frame shown in the sketch below. Car #1 Speed 2vo (constant) +x Car #2 Initial speed vo Acceleration a x= 0 (a) your answer in terms of the known constants vo, and a. What are the positions of the two cars when they both have the same speed? Express (b) same horizontal position again. What is the position of the two cars when this happens? At some point, the accelerating car will catch up and the two cars will be at the Sketch plots of the position x and velocity vx VS. time. On each plot the motion of (c) both cars should be shown.arrow_forwardTwo kids decided to play with their toys, balls. The first kid is on the ground (0.00 meter), whereas the second kid is on top of a 10.00-meter tall building. The second kid threw his ball at the same time that the first kid throws another ball upward. At the time that the first kid’s ball reaches its maximum height, the two balls will collide. i.) Compute for the initial speed of the first kid’s ball. ii.) Determine at what time and at what height the two balls will collide.arrow_forward
- F1 RDY RAY The figure above is a pin-joint frame with horizontal member length l = 3m and vertical member length h = 5m. (Note that the diagram is not to scale.) You are given that F = 48KN, RAY = 16KN and Rpy = 32kN. Use the method of sections to calculate the forces in members BC, FC and FE. Enter your answers in kilonewtons (kN) correct to 2 decimal places. Enter FBC : kN ype here to searcharrow_forwardA. From the perspective of point x, vector a and vector b are approaching with around the same speed. From Joseph's perspective, the two are walking with around the same speed. Determine if vector a is approaching with the same speed, twice the speed, or half the speed from the perspective of vector b. Explain.B. Vectors x and y are moving with uniform velocities. If the image below is t = 0, how long will it take (in seconds) for vector x to be in the same position with vector y? How far should vector x have traveled (in meters) by the time it has overtaken the position of vector y? Show proper solution.arrow_forwardJill claims that her new rocket, is 110 m long. As she flies past your house, you measure the rocket's length and find that it is only 70 m G Part A What is Jill's speed, as a fraction of c? V= 15 ΑΣΦ V Submit Provide Feedback Request Answer ? •Carrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University