A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.77 of the person's regular weight. Calculate the acceleration of the elevator. (Write the value and SI unit. Write 2 as s^2. Sign is important. (+) signifies upward and (-) signifies downward direction.)

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.77 of the person's regular weight. Calculate the acceleration of the elevator. (Write the value and SI unit. Write 2 as s^2. Sign is important. (+) signifies upward and (-) signifies downward direction.)

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter4: Forces In One Dimension

Section: Chapter Questions

Problem 6STP

See similar textbooks

Similar questions

A block of mass m1= 10 kg is on a frictionless table to the left of a second block of mass m2 = 24 kg, attached by a horizontal string (Figure WU4.13). If a horizontal force of 120 N is exerted on the block m2in the positive x-direction, (a) use the system approach to find the acceleration of the two blocks. (b) What is the tension in the string connecting the blocks? (See Section 4.6.) Figure WU4.13
The helicopter view in Fig. P3.15 shows two people pulling on a stubborn mule. The person on the right pulls with a force F1 of magnitude 120 X and direction of 1 = 60.0. The person on the left pulls with a force F2 of magnitude 80.0 N and direction of 2 = 75.0. Find (a) the single force that is equivalent to the two forces shown and (b) the force that a third person would have to exert on the mule to make the resultant force equal to zero. The forces are measured in units of newtons (symbolized N). Figure P3.15
The helicopter view in Figure P1.70 shows two people pulling on a stubborn mule. Find (a) the single force that is equivalent to the two forces shown and (b) the force a third person would have to exert on the mule to make the net force equal to zero. The forces are measured in units of newtons (N). Figure P1.70
Two monkeys are holding onto a single vine of negligible mass that hangs vertically from a tree, with one monkey a few meters higher than the other. The upper monkey has mass 20.0 kg and the lower monkey mass 10.0 kg. What is the ratio of the tension in the vine above the upper monkey to the tension in the vine between the two monkeys? (Sec Section 4.5.)
Determine whether each of the following statements is true or false. a. An objects weight is always equal to its mass. b. The force of tension always pushes. c. The magnitude of the sum of the forces on an object is never greater than its weight. Explain.
Consider a person standing on a scale in an elevator. If the elevator accelerates upwards with an acceleration of 1.21 m/s2 and the person has a mass of 102.9 kg, what would the scale read? HINT: you need to take into account the acceleration due to gravity, as well as that of the elevator.
Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 67.0 N, the second a force of 94.0 N, friction is 20.0 N, and the mass of the third child plus wagon is 23.0 kg. a. Calculate the acceleration in m/s2. (Enter the magnitude.) b. What would the acceleration be (in m/s2) if friction were 27.0 N? (Enter the magnitude.)
A bowling weighs 71.2 N (16.0 lb). The bowler applies a horizontal force of 160 N (36.0 lb). What is the magnitude of the horizontal acceleration of the ball?
At launch a rocket has a mass of 3.66×104 kg, and the thrust of the engines is 5.34×105 N. If the rocket is launched straight upwards from the surface of Earth, what is the initial acceleration of the rocket? Take upwards to be the positive direction. Express your answer in m/s2 to 3 significant figures. Use g=9.81 m/s2.
A block of mass 146 kg lies on a horizontal plane. A horizontal force F of magnitude 1035 N is applied to the block causing it to move 2.06 meters. If the coefficient of friction between the block and the horizontal surface is 0.39, find the acceleration (in m/s2 ) of the block. Round off only on the final answer expressed in 3 decimal places. Use g = 9.81 m/s2
A firefighter of mass 79 kg slides down a vertical pole with an acceleration of 4 m/s2.The acceleration of gravity is 10 m/s2.What is the friction force that acts on him?Answer in units of N.
Calculate the force mg of a car that is heading up a 4 degree angle ( 4 degree angle with the horizontal) with mass of 1500kg. a/ find the component of mg perpendicular to the incline pllane b/ find the component of mg parallel to the incline plane ? c/ mg=? N