The average speed becomes a close approximation to the instantaneous speed when: Select one: O The distance between the two photogates is reduced None of the offered choices fits. O The air track surface is inclined O The friction is reduced O The distance between the two photogates is maximized An object is said to be accelerating when: Select one: O Its velocity is zero O Its velocity is decreasing with respect to time O Its velocity does not change O None of the offered choices fits O Its velocity is increasing with respect to time

The average speed becomes a close approximation to the instantaneous speed when: Select one: O The distance between the two photogates is reduced None of the offered choices fits. O The air track surface is inclined O The friction is reduced O The distance between the two photogates is maximized An object is said to be accelerating when: Select one: O Its velocity is zero O Its velocity is decreasing with respect to time O Its velocity does not change O None of the offered choices fits O Its velocity is increasing with respect to time

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 32P: A Lockheed Martin F-35 II lighting jet takes off from an aircraft carrier with a runway length of 90...

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A man on a motorcycle traveling at a uniform speed of 10 m/s throws an empty can straight upward relative to himself with an initial speed of 3.0 m/s. Find the equation of the trajectory as seen by a police officer on the side of the road. Assume the initial position of the can is the point where it is thrown. Ignore air resistance.
A boat can be rowed at 8.0 km/h in still water. (a) How much time is required to row 1.5 km downstream in a river moving 3.0 km/h relative to the shore? (b) How much time is required for the return trip? (c) In what direction must the boat be aimed to row straight across the river? (d) Suppose the river is 0.8 km wide. What is the velocity of the boat with respect to Earth and how much time is required to get to the opposite shore? (e) Suppose, instead, the boat is aimed straight across the river. How much time is required to get across and how far downstream is the boat when it reaches the opposite shore?
A landscape architect is planning an artificial waterfall in a city park. Water flowing at 1.70 m/s will leave the end of a horizontal channel at the top of a vertical wall h = 2.35 m high, and from there it will fall into a pool (Fig. P3.42). (a) Will the space behind the waterfall be wide enough for a pedestrian walkway? (b) To sell her plan to the city council, the architect wants to build a model to standard scale, which is one-twelfth actual size. How fast should the water flow in the channel in the model? Figure P3.42
Figure 2.14a is a diagram of a multiflash image of an air puck moving to the right on a horizontal surface. The images sketched are separated by equal time intervals, and the first and last images show the puck al rest. (a) In Figure 2.14b, which color graph best shorn the pucks position as a function of time? (b) In Figure 2.14c, which color graph best shows the pucks velocity as a function of time? (c) In Figure 2.l4d, which color graph best shows the puck's acceleration as a function of time? Figure 2.14 (Quick Quiz 2.5) Choose the correct graphs.
A Lockheed Martin F-35 II lighting jet takes off from an aircraft carrier with a runway length of 90 m and a takeoff speed 70 m/s at the end of the runway. Jets are catapulted into airspace from the deck of an aircraft carrier with two sources of propulsion: the jet propulsion and the catapult. At the point of leaving the deck of the aircraft carrier, the F-35’s acceleration decreases to a constant acceleration of 5.0m/s2 at 30 with respect to the horizontal. (a) What is the initial acceleration of the F-35 on the deck of the aircraft carrier to make it airborne? (b) Write the position and velocity of the F-35 in unit vector notation from the point it leaves the deck of the aircraft carrier. (c) At what altitude is the fighter 5.0 s after it leaves the deck of the aircraft carrier? (d) What is its velocity and speed at this time? (e) How far has it traveled horizontally?
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