1.A body hangs from a spring balance supported from the roof of an elevator. Ifthe elevator has an upward acceleration of 4 ft/sec squared and the balancereads 45 Ib, what is the true weight of the body in Ib?2.A balloon is ascending at the rate of 12 kph and is being carried horizontally bya wind at 22 kph. If the bomb dropped from the balloon such that it takes 9 secto reach the ground, what is the balloon's altitude when the bomb was released?3.What is the binary equivalent with sign bit of -5 in 2's complement?4.Two cars, A and B, are traveling along the same route. Car A is traveling at 4.5m/s and has a mass of 1150 kg. Car B is traveling at 6.7 m/s and has a mass of1300 kg. If Car B gently bumps in car A and their bumpers lock together, what willbe their common velocity?5.Which of the following occurs during evaporation? 6.A wheel of 40 cm radius rotates in a stationary axle. It is uniformly speeded upfrom rest to a speed of 900 rpm in a time of 20 sec. Find the tangentialacceleration of a point on its rim.7.The input and output voltages of an amplifier network are 1 V and 8 Vrespectively. If the input impedance are equal. What is the voltage gain (or loss)?8.Determine the maximum shearing stress in a helical steel spring composed of20 turns of 20mm diameter wire on a mean radius of 80 mm when the spring issupporting a load of 2 kN.9.The original cost of a certain piece of equipment is P150,000 and it isdepreciated by 10% sinking fund method. Determine the annual depreciationcharge if the book value of the equipment after 10 years is the same as if it hadbeen depreciated at 14,000 each year by straight line method.10.Fusion point andoccur at the same temperature.

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1.A body hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 4 ft/sec squared and the balance reads 45 Ib, what is the true weight of the body in Ib?

1.A body hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 4 ft/sec squared and the balance reads 45 Ib, what is the true weight of the body in Ib?

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 89AP: In building a house, carpenters use nails from a large box. The box is suspended from a spring twice...

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Concept explainers

Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).

Question

1.A body hangs from a spring balance supported from the roof of an elevator. If
the elevator has an upward acceleration of 4 ft/sec squared and the balance
reads 45 Ib, what is the true weight of the body in Ib?
2.A balloon is ascending at the rate of 12 kph and is being carried horizontally by
a wind at 22 kph. If the bomb dropped from the balloon such that it takes 9 sec
to reach the ground, what is the balloon's altitude when the bomb was released?
3.What is the binary equivalent with sign bit of -5 in 2's complement?
4.Two cars, A and B, are traveling along the same route. Car A is traveling at 4.5
m/s and has a mass of 1150 kg. Car B is traveling at 6.7 m/s and has a mass of
1300 kg. If Car B gently bumps in car A and their bumpers lock together, what will
be their common velocity?
5.Which of the following occurs during evaporation?

6.A wheel of 40 cm radius rotates in a stationary axle. It is uniformly speeded up
from rest to a speed of 900 rpm in a time of 20 sec. Find the tangential
acceleration of a point on its rim.
7.The input and output voltages of an amplifier network are 1 V and 8 V
respectively. If the input impedance are equal. What is the voltage gain (or loss)?
8.Determine the maximum shearing stress in a helical steel spring composed of
20 turns of 20mm diameter wire on a mean radius of 80 mm when the spring is
supporting a load of 2 kN.
9.The original cost of a certain piece of equipment is P150,000 and it is
depreciated by 10% sinking fund method. Determine the annual depreciation
charge if the book value of the equipment after 10 years is the same as if it had
been depreciated at 14,000 each year by straight line method.
10.Fusion point and
occur at the same temperature.

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