Concept explainers
BIO BALLISTIC SEED DISPERSAL. Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of these seeds can be determined with a high-speed camera. In an experiment on one type of plant, seeds are projected at 20 cm above ground level with initial speeds between 2.3 m/s and 4.6 m/s. The launch angle is measured from the horizontal, with +90° corresponding to an initial velocity straight up and −90° straight down.
3.82 The experiment is designed so that the seeds move no more than 0.20 mm between photographic frames. What minimum frame rate for the high-speed camera is needed to achieve this? (a) 250 frames/s; (b) 2500 frames/s; (c) 25.000 frames/s; (d) 250,000 frames/s.
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
Additional Science Textbook Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Tutorials in Introductory Physics
Essential University Physics (3rd Edition)
Physics for Scientists and Engineers with Modern Physics
College Physics (10th Edition)
Life in the Universe (4th Edition)
- Figure OQ3.3 shows a birds-eye view of a car going around a highway curve. As the car moves from point 1 to point 2, its speed doubles. Which of the vectors (a) through (e) shows the direction of the cars average acceleration between these two points?arrow_forwardA firefighter, a distance d from a burning building, directs a stream of water from a fire hose at angle i above the horizontal as shown in Figure P3.16. If the initial speed of the stream is vi, at what height h does the water strike the building? Figure P3.16arrow_forwardA basketball player is standing on the floor 10.0 m from the basket as in Figure P3.47. The height of the basket is 3.05 m, and he shoots the ball at a 40.0 angle with the horizontal from a height of 2.00 m. (a) What is the acceleration of the basketball at the highest point in its trajectory? (b) At what speed must the player throw the basketball so that the ball goes through the hoop without striking the backboard?arrow_forward
- A particle initially located at the origin has an acceleration of a=3.00jm/s2 and an initial velocity of vi=5.00im/s. Find (a) the vector position of the particle at any time t, (b) the velocity of the particle at any time t, (c) the coordinates of the particle at t = 2.00 s, and (d) the speed of the particle at t = 2.00 s.arrow_forwardThe same vectors that are shown in Figure P3.6 are shown in Figure P3.42. The magnitudes are F1 = 1.90f, F2 = f, and F3 = 1.4f, where f is a constant. a. Use the coordinate system shown in Figure P3.42 to find R=F1+F2+F3 in component form in terms of f. b. If Rx = 0.33, what is Ry? c. Check your result by comparing your answer to that of Problem 6. FIGURE P3.42arrow_forwardOlympus Mons on Mars is the largest volcano in the solar system, at a height of 25 km and with a radius of 312 km. If you are standing on the summit, with what Initial velocity would you have to fire a projectile from a cannon horizontally to clear the volcano and land on the surface of Mars? Note that Mars has an acceleration of gravity of 3.7m/s2 .arrow_forward
- The figure shows the path taken by a drunk skunk over level ground, from initial point i to final point f. The angles are 0, - 32.0°, e2 = 49.0°, and e3 = 84.0°, and the distances are d= 4.80 m, d2 = 7.30 m, and d3 = 10.0 m. What are the (a) magnitude and (b) angle of the skunk's displacement from i to f? Give the angle as a positive (counterclockwise) or negative (clockwise) angle of magnitude less than 180°, measured from the +x direction. dy dg (a) Number 9.853 Units (b) Number -123.8 Units (degrees)arrow_forwardDuring a heated game of bocce ball, Ursula is attempting to knock the pallino (the small, white target ball) away from where her opponent's balls lie on the ground. She can do this by throwing her ball so that it lands directly on top of the pallino, which is x = 17 m horizontally downcourt from where she throws. If she releases the ball y = 0.90 m above the ground at an angle of 0 = 23° above the horizontal, then how much time will the ball spend airborne before hitting the pallino? Both balls may be treated as point particles in this problem.arrow_forwardProblem 4: A person shoots a gun at a target that is 65 m away. The center of the target is at the same height as the gun. The person aims the gun upward at an angle so that the bullet hits the center of the target. The bullet leaves the gun at a velocity of 210 m/s. What is the angle of the gun in degrees from the positive x-axis? Numeric : A numeric value is expected and not an expression.arrow_forward
- A baseball is thrown at an angle θ = 39° above the horizontal with an initial vertical velocity v0y = 14.5 m/s. Use a Cartesian coordinate system with the origin at the baseball's initial position. Create an expression for the ball’s initial horizontal velocity component, v0x, in terms of v0y, sin(θ), and cos(θ). v0x = Calculate the initial horizontal velocity component, v0x in m/s. Find the ball’s initial velocity magnitude, v0 in m/s.arrow_forwardProblem 12: Mt. Asama, Japan, is an active volcano complex. In 2009, an eruption threw solid volcanic rocks that landed far from the crater. Suppose that one such rock was launched at an angle of 0 = 52.3 degrees above horizontal, and landed a horizontal distance d = 850 m from the crater, and a vertical distance h = 620 m below the crater. Part (a) Write and expression for vo, the initial speed of the rock in terms of 0, d, and h. Expression : Vo = Select from the variables below to write your expression. Note that all variables may not be required. cos(a), cos(4), cos(0), sin(a), sin(), sin(0), ß, y, 0, d, g, h, m, n, P Part (b) What is the initial speed of the rock in m/s? Numeric :A numeric value is expected and not an expression. Vo = Part (c) How long, in seconds, was the rock in the air? Numeric :A numeric value is expected and not an expression. t =arrow_forwardFrom the top of a cliff overlooking a lake, a person throws two stones, as shown in the drawing. The cliff is 33.7 m high. The two stones described have identical initial speeds of v0 = 13.9 m/s and are thrown at an angle θ = 21.0 °, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the water? Neglect air resistance. I do not know where to startarrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning