College Physics: A Strategic Approach Plus Mastering Physics with Pearson eText -- Access Card Package (4th Edition) (What's New in Astronomy & Physics)
4th Edition
ISBN: 9780134641492
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Chapter 6, Problem 12CQ
In Figure Q6.11, at the instant shown, is the apparent weight of the car’s driver greater than, less than, or equal to his true weight? Explain.
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NASA's KC-135 Reduced Gravity Research aircraft, affectionately known as the "Vomit Comet," is used in training astronauts and testing equipment for microgravity environments. During a typical mission, the
aircraft makes approximately 30 to 40 parabolic arcs. During each arc, the aircraft and objects inside it are in free-fall, and passengers float freely in apparent "weightlessness."
The figure below shows the altitude of the aircraft during a typical mission. It climbs from 24,000 ft to 31,600 ft, where it begins a parabolic arc with a velocity of 150 m/s at 45.0° nose-high and exits with
velocity 150 m/s at 45.0° nose-low.
Altitude (ft)
31 000
24 000
45° nose high
0
Zero g
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45° nose low
Maneuver time (s)
(a) What is the aircraft's speed (in m/s) at the top of the parabolic arc?
m/s
(c) What is the time (in s) spent in microgravity?
65
(b) What is the aircraft's altitude (in ft) at the top of the parabolic arc?
ft
A. Use the relation g=- to find the acceleration due to gravity on the surface
GM
R²₂
of the Moon. You can use the following data:
Mass of the Moon M = 7.35 × 1022 kg. Radius of the Moon R = 1.74 × 106 m.
B. How does this value compare with the acceleration due to gravity g = 9.81m/s²
on the Earth's surface?
C. The center-to-center distance between the Earth and the Moon is 3.84 × 108 m.
Calculate the orbital speed of the Moon as it revolves round the Earth.
Then estimate the period of revolution of the Moon from the given data. Express
your answer in days for this part.
(Mass of the Earth M₂= 5.97 x 1024 kg.)
Task 1: Gravitational Fields
1. A person with a mass of 60 kg is inside a rocket that is moving straight up, away from the earth's
surface. The radius of the earth is 6.38 x 105 m and the mass of the earth is 5.98 x 1024 kg.
a. Find the force of gravity acting on the person at an altitude of 300 000 m.
b.
Find the altitude that will cause the person's weight to drop to one-quarter of its value on the
earth's surface.
2. Mass 1 is four times as large as mass 2. Both masses are at rest and are separated by 200 m. Where
could you place a third mass, mass 3, if the net force on 3 must be zero?
Chapter 6 Solutions
College Physics: A Strategic Approach Plus Mastering Physics with Pearson eText -- Access Card Package (4th Edition) (What's New in Astronomy & Physics)
Ch. 6 - A cyclist goes around a level, circular track at...Ch. 6 - In uniform circular motion, which of the following...Ch. 6 - Prob. 3CQCh. 6 - Prob. 4CQCh. 6 - Large birds like pheasants often walk short...Ch. 6 - When you drive fast on the highway with muddy...Ch. 6 - A ball on a string moves in a vertical circle as...Ch. 6 - Give an everyday example of circular motion for...Ch. 6 - Give an everyday example of circular motion for...Ch. 6 - Prob. 10CQ
Ch. 6 - A car coasts at a constant speed over a circular...Ch. 6 - In Figure Q6.11, at the instant shown, is the...Ch. 6 - Riding in the back of a pickup truck can be very...Ch. 6 - Playground swings move through an arc of a circle....Ch. 6 - Variation in your apparent weight is desirable...Ch. 6 - Prob. 16CQCh. 6 - Why is it impossible for an astronaut inside an...Ch. 6 - If every object in the universe feels an...Ch. 6 - A mountain climbers weight is slightly less on the...Ch. 6 - Prob. 20CQCh. 6 - A ball on a string moves around a complete circle,...Ch. 6 - As seen from above, a car rounds the curved path...Ch. 6 - As we saw in the chapter, wings on race cars push...Ch. 6 - Prob. 24MCQCh. 6 - Prob. 25MCQCh. 6 - The cylindrical space station in Figure Q6.25, 200...Ch. 6 - The radius of Jupiter is 11 times that of earth,...Ch. 6 - A newly discovered planet has twice the mass and...Ch. 6 - Suppose one night the radius of the earth doubled...Ch. 6 - Currently, the moon goes around the earth once...Ch. 6 - Two planets orbit a star. You can ignore the...Ch. 6 - A 5.0-m-diameter merry-go-round is turning with a...Ch. 6 - Prob. 2PCh. 6 - An old-fashioned LP record rotates at 3313rpm. a....Ch. 6 - A typical hard disk in a computer spins at 5400...Ch. 6 - Prob. 5PCh. 6 - The horse on a carousel is 4.0 m from the central...Ch. 6 - The radius of the earths very nearly circular...Ch. 6 - Modern wind turbines are larger than they appear,...Ch. 6 - Prob. 9PCh. 6 - Prob. 10PCh. 6 - Prob. 11PCh. 6 - A typical running track is an oval with...Ch. 6 - Figure P6.13 is a birds-eye view of particles on a...Ch. 6 - In short-track speed skating, the track has...Ch. 6 - Prob. 15PCh. 6 - A cyclist is rounding a 20-m-radius curve at 12...Ch. 6 - A 1500 kg car drives around a flat 200-m-diameter...Ch. 6 - A fast pitch softball player does a windmill...Ch. 6 - Prob. 19PCh. 6 - A wind turbine has 12,000 kg blades that are 38 m...Ch. 6 - Youre driving your pickup truck around a curve...Ch. 6 - Prob. 22PCh. 6 - Gibbons, small Asian apes, move by brachiation,...Ch. 6 - The passengers in a roller coaster car feel 50%...Ch. 6 - Prob. 25PCh. 6 - A roller coaster car is going over the top of a...Ch. 6 - As a roller coaster car crosses the top of a...Ch. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - A satellite orbiting the moon very near the...Ch. 6 - Spacecraft have been sent to Mars in recent years....Ch. 6 - The centers of a 10 kg lead ball and a 100 g lead...Ch. 6 - The gravitational force of a star on an orbiting...Ch. 6 - The free-fall acceleration at the surface of...Ch. 6 - What is the ratio of the suns gravitational force...Ch. 6 - Prob. 38PCh. 6 - In recent years, astronomers have found planets...Ch. 6 - Prob. 40PCh. 6 - a. What is the gravitational force of the sun on...Ch. 6 - What is the value of g on the surface of Saturn?...Ch. 6 - What is the free-fall acceleration at the surface...Ch. 6 - Prob. 44PCh. 6 - Prob. 45PCh. 6 - Prob. 46PCh. 6 - Prob. 47PCh. 6 - Planet X orbits the star Omega with a year that is...Ch. 6 - The International Space Station is in a...Ch. 6 - An earth satellite moves in a circular orbit at a...Ch. 6 - In recent years, scientists have discovered...Ch. 6 - In recent years, scientists have discovered...Ch. 6 - In recent years, scientists have discovered...Ch. 6 - How fast must a plane fly along the earths equator...Ch. 6 - Prob. 55GPCh. 6 - A 75 kg man weighs himself at the north pole and...Ch. 6 - Prob. 57GPCh. 6 - Prob. 58GPCh. 6 - Prob. 60GPCh. 6 - Prob. 61GPCh. 6 - Prob. 62GPCh. 6 - Prob. 63GPCh. 6 - Prob. 64GPCh. 6 - A 5.0 g coin is placed 15 cm from the center of a...Ch. 6 - In an old-fashioned amusement park ride,...Ch. 6 - The 0.20 kg puck on the frictionless, horizontal...Ch. 6 - While at the county fair, you decide to ride the...Ch. 6 - A car drives over the top of a hill that has a...Ch. 6 - The ultracentrifuge is an important tool for...Ch. 6 - A sensitive gravimeter at a mountain observatory...Ch. 6 - Prob. 72GPCh. 6 - Planet Z is 10,000 km in diameter. The free-fall...Ch. 6 - How long will it take a rock dropped from 2.0 m...Ch. 6 - A 20 kg sphere is at the origin and a 10 kg sphere...Ch. 6 - a. At what height above the earth is the free-fall...Ch. 6 - Mars has a small moon, Phobos, that orbits with a...Ch. 6 - You are the science officer on a visit to a...Ch. 6 - Europa, a satellite of Jupiter, is believed to...Ch. 6 - The direction of the net force on the craft is A....Ch. 6 - Suppose a spacecraft orbits the moon in a very...Ch. 6 - How much time does it take for the spacecraft to...Ch. 6 - The material that comprises the side of the moon...
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