A student fires a cannonball vertically upwards with a speed of 31.0m/s. Determine all unknowns and answer the following questions. Neglect drag and the initial height and horizontal motion of the cannonball. What was the cannonball's maximum height? unit How long did the cannonball rise? unit What was the cannonball's total flight time? unit

A student fires a cannonball vertically upwards with a speed of 31.0m/s. Determine all unknowns and answer the following questions. Neglect drag and the initial height and horizontal motion of the cannonball. What was the cannonball's maximum height? unit How long did the cannonball rise? unit What was the cannonball's total flight time? unit

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 70P: Unreasonable results A dolphin in an aquatic show jumps straight up out of the water at a velocity...

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Unreasonable results A dolphin in an aquatic show jumps straight up out of the water at a velocity of 15.0 m/s. (a) List the knowns in this problem. (b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known, and identify its value. Then, identify the unknown and discuss how you chose the appropriate equation to solve for ft. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long a time is the dolphin in the air? Neglect any effects resulting from his size or orientation.
A student launches a small rocket which starts from rest at ground level. At a height 1.74 km, the rocket reaches a speed of 251m/s. At that height, the rocket runs of fuel so there is nolonger any thrust propelling it. Take the positive direction to be upward.a. assuming constant acceleration, what is the rocket's accerlation in m/s2 during the period from its launch until it runs out of fuel?b. afther the rocket's engine turns off at a height of 1.74km it continues to move upward due tothe velocity it reached. what is the rocket's acceleration in m/s2 during the engine shutoff until it returns to the ground. Ignore aire resistancec. calculate the maximum height, in meters, above groudn level that the rocket reaches
Now let’s apply our definition of average velocity to a swimming competition. During one heat of a swim meet, a swimmer performs the crawl stroke in a pool 50.0 mm long, as shown in (Figure attached). She swims a length at racing speed, taking 24.0 ss to cover the length of the pool. She then takes twice that time to swim casually back to her starting point. Find (a) her average velocity for each length and (b) her average velocity for the entire swim. If the swimmer could cross a 13 kmkm channel maintaining the same average velocity as for the first 50 mm in the pool, how long would it take? Express your answer in hours.
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An astronaut on a strange planet finds that she can jump a maximum horizontal distance of 15m if her initial speed is 3 m/s. What is the free-fall acceleration on the planet (i.e. what is the gravitational acceleration of this planet)?
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When one person launched a model rocket straight upwards, it will accelerate at 3.7g(g=9.81m/s^2) for 4.1 seconds. Then the rocket will burn out(ignore air friction).What is the maximum height the rocket will reach? And what will the time from launch until it returns to the ground?
A rescue helicopter is hovering over a person whose boathas sunk. One of the rescuers throws a life preserver straightdown to the victim with an initial velocity of 1.40 m/s andobserves that it takes 1.8 s to reach the water. (a) List theknowns in this problem. (b) How high above the water wasthe preserver released? Note that the downdraft of thelife preserver, so that an acceleration equal to that of gravityis reasonablehelicopter reduces the effects of air resistance on the falling
I'm not sure how to solve this! I tried and got 1.3 / 2.4 seconds. Am i right? Could you explain how to do it if i'm not? Cheers ! In a classic Seinfeld episode, Jerry tosses a loaf of bread (a marble rye) straight upward to his friend George who is leaning out of a third-story window. If the loaf of bread leaves Jerry's hand at a height of 1 m with an initial velocity of 18 m/sec, write an equation for the vertical position of the bread s (in meters) t seconds after release. How long will it take the bread to reach George if he catches the bread on the way up at a height of 16 m? Round to the nearest tenth of a second.
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Two ducks, Donald and Cassiopeia, are gliding gracefully toward eachother along a pond, in a straight line. Donald is initially moving at v =0.500 m/s, and begins accelerating at 0.100 m/s2 at t = 0 s. Cassiopeiamoves at a constant speed of v = 0.700 m/s. If they are initially separatedby 25.0 m, where will they collide? Take Donald’s initial position as theorigin. How long will it take for them to collide?
A ball is thrown with an initial speed of 20 ?/? from one end of a horizontal platform with a length of 48 ? and a height of 32 ? at angle of 37° to the the horizontal. At the same time a man who is standing on the ground starts from rest and moves with a constant acceleration of ?(see Figure). (a) Find the time of flight of the ball (b) What should be the acceleration of the man so that he can hold the ball before it falls? cos53o =sin37o=0.6 cos37o =sin53o=0.8 g=9.8 m/s2