Number 20 (b) Assuming the x component is known to be positive,specify the vector which, if you add it to the original one,would give a resultant vector that is 80.0 units long andpoints entirely in the- x direction.3-5 and 3-6 Projectile Motion (neglect air resistance)17. (I) A tiger leaps horizontally from a 7.5-m-high rock witha speed of 3.0 m/s. How far from the base of the rock willshe land?18. (I) A diver running 2.5 m/s dives out horizontally from theedge of a vertical cliff and 3.0s later reaches the waterbelow. How high was the cliff and how far from its base didthe diver hit the water?19. (II) Estimate by what factor a person can jump farther onthe Moon as compared to the Earth if the takeoff speedand angle are the same. The acceleration due to gravity onthe Moon is one-sixth what it is on Earth.20. (II) A ball is thrown horizontally from the roof of a build-ing 7.5 m tall and lands 9.5 m from the base. What was theball's initial speed?21. (II) A ball thrown horizontally at 12.2 m/s from the roof ofa building lands 21.0 m from the base of the building. Howhigh is the building?

The vertical displacement is, y=uyt+12gt2 uy=0y=12gt2t=2yg=27.5 m9.80 m/s2=1.24 s

Answered: (II) A ball is thrown horizontally from…

(II) A ball is thrown horizontally from the roof of a build- ing 7.5 m tall and lands 9.5 m from the base. What was the ball's initial speed?

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 44P: The maximum horizontal distance a boy can throw a ball is 50 m. Assume he can throw with the same...

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Concept explainers

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

Number 20

(b) Assuming the x component is known to be positive,
specify the vector which, if you add it to the original one,
would give a resultant vector that is 80.0 units long and
points entirely in the
- x direction.
3-5 and 3-6 Projectile Motion (neglect air resistance)
17. (I) A tiger leaps horizontally from a 7.5-m-high rock with
a speed of 3.0 m/s. How far from the base of the rock will
she land?
18. (I) A diver running 2.5 m/s dives out horizontally from the
edge of a vertical cliff and 3.0s later reaches the water
below. How high was the cliff and how far from its base did
the diver hit the water?
19. (II) Estimate by what factor a person can jump farther on
the Moon as compared to the Earth if the takeoff speed
and angle are the same. The acceleration due to gravity on
the Moon is one-sixth what it is on Earth.
20. (II) A ball is thrown horizontally from the roof of a build-
ing 7.5 m tall and lands 9.5 m from the base. What was the
ball's initial speed?
21. (II) A ball thrown horizontally at 12.2 m/s from the roof of
a building lands 21.0 m from the base of the building. How
high is the building?

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