PROBLEM 2.37 You drop a water balloon straight down from your dormitory window 100 m above your friend's head. At 2.5 s after you drop the balloon, your friend (not aware that the balloon has water in it) fires a dart from a gun, which is at the same height as his head, directly upward toward the balloon with an initial velocity of 25 m/s. 47. How long after you drop the balloon will the dart burst the balloon? 1.246 s с. 1.446 s d. 1.546 s а. b. 1.346 s 48. How long after the dart hits the balloon will your friend have to move out of the way of the falling water? Assume the balloon breaks instantaneously at the touch of the dart. 0.57 s c. 0.87 s d. 0.77 s а. b. 0.67 s

PROBLEM 2.37 You drop a water balloon straight down from your dormitory window 100 m above your friend's head. At 2.5 s after you drop the balloon, your friend (not aware that the balloon has water in it) fires a dart from a gun, which is at the same height as his head, directly upward toward the balloon with an initial velocity of 25 m/s. 47. How long after you drop the balloon will the dart burst the balloon? 1.246 s с. 1.446 s d. 1.546 s а. b. 1.346 s 48. How long after the dart hits the balloon will your friend have to move out of the way of the falling water? Assume the balloon breaks instantaneously at the touch of the dart. 0.57 s c. 0.87 s d. 0.77 s а. b. 0.67 s

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 54P: Unreasonable results At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a...

See similar textbooks

Similar questions

A person sitting in an enclosed train car, moving at constantvelocity, throws a ball straight up into the air in her referenceframe. (a) Where does the ball land? What is your answerif the car (b) accelerates, (c) decelerates, (d) rounds a curve,(e) moves with constant velocity but is open to the air?
You were standing at the high rise building in fountain breeze condominiumnear PATTS with a height of 180 m. Ignoring air resistance. If you dropped aball (a) how long is the ball in state of free fall before it reaches theground? (b) Where is the ball after 5 s of free fall?
1. (a) It took a ball 0.64 seconds to fall to the ground when dropped from a height.What was the height?(b) A ball was dropped from 45 m; how long would it take to strike the round?
A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victim with an initial velocity of 1.40 m/s and observes that it takes 1.8 s to reach the water. (a) List the knowns in this problem. (b) How high above the water was the preserver released? Note that the downdraft of the helicopter reduces the effects of air resistance on the falling life preserver, so that an acceleration equal to that of gravity is reasonable.
Unreasonable results At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a rate of 2.00m/s2 . (a) How far does she travel in the next 5.00 s? (b) What is her final velocity? (c) Evaluate the result. Does it make sense?
A small mailbag is released from a helicopter that is descending steadily at 1.50 m/s. After 2.00 s, (a) what is the speed of the mailbag, and (b) how far is it below the helicopter? (c) What are your answers to parts (a) and (b) if the helicopter is rising steadily at 1.50 m/s?
A car is traveling at a steady 88km/h in a 50km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 7.6 a)How much time elapses before the motorcycle is moving as fast as the car? b)How far is the motorcycle from the car when it reaches this speed?
A driver needs to make a delivery to an office that is 30 km away. The driver has traveled for 45 minutes west down a straight road at 50 km/h. a. Has the driver traveled far enough to reach the office? Support your response. b. Assume the driver has gone far enough and is traveling on the correct road. If he has not yet seen the business, what should he do to make the delivery? Explain your reasoning. Plzzz help
During a thunderstorm a bolt of lightning strikes 2.41 km away from you. (a) How much time elapsesbetween when the lightning strikes and when the light reachesyour eyes? (b) If the speed of sound is 343 m>s, how much timeelapses before the sound of thunder reaches your ears?
A rock is thrown straight upward with an initial velocity of 18 m/s. (a) How long does it take to get to the top of the trajectory? (b) How high does it reach??
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
A person standing on the roof of a building 12 m high throws a ball upward with a velocity, Vₒᵧ = 22 m/s. Calculate (a) How high does the ball go with respect to the ground? and (b) What is the ball's velocity, V_fy, at impact?