Answered: A student who weighs 559 N climbs a…

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter4: Work And Energy

Section: Chapter Questions

Problem NM: KEY TERMS 1. work (4.1) 2. joule 3. foot-pound 4. energy (4.2) 5. kinetic energy 6. potential energy...

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Question

A student who weighs 559 N climbs a stairway (vertical height of 3.7 m) in 22 s.

(a) How much work is done?
=_____ Joules

(b) What is the power output of the student?
=_____ Watts

________________________________________________________________________________

Which has more kinetic energy: a 0.0012-kg bullet traveling at 395 m/s or a 6.0 10⁷-kg ocean liner traveling at 13 m/s (25 knots)?

the bullet has greater kinetic energy

--------------or----------------------

the ocean liner has greater kinetic energy

Justify your answer.

E_k-bullet	=	_______Joules
E_{k-ocean liner}	=	_______Joules

______________________________________________________________________________

(a) What is the kinetic energy in joules of a 1150-kg automobile traveling at 79 km/h?
=_______ Joules

(b) How much work would have to be done to bring a 1150-kg automobile traveling at 79 km/h to a stop?
=_________Joules

________________________________________________________________________________

How much work does gravity do on a 0.110-kg ball falling from a height of 24.0 m? (Neglect air resistance.)
=__________ Joules

_______________________________________________________________________________

How would the force of gravity between two masses be affected if the separation distance between them were the following? (Assume F₂ represents the new force and F₁ represents the original force.)

(a) quadruple the original distance
F₂ / F₁ = _______

(b) one-fifth the original distance
F₂ / F₁ = ________

________________________________________________________________________________An airplane flying directly eastward at a constant speed travels 298 km in 2.0 h.

(a) What is the average velocity of the plane?
=_________ km/h

(b) What is its instantaneous velocity?
=_________ km/h

________________________________________________________________________________

Round 9220.

to two significant figures

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