Construction workers are building a new skyscraper in a major city. A crane operator is using a crane to lift a heavy box of supplies (with a mass of 687 kg) to the top of the building when the cord suddenly snaps! The box of supplies free-falls to the ground from a height of 142 m. How many seconds does it take for the supplies to crash into the ground below?

Construction workers are building a new skyscraper in a major city. A crane operator is using a crane to lift a heavy box of supplies (with a mass of 687 kg) to the top of the building when the cord suddenly snaps! The box of supplies free-falls to the ground from a height of 142 m. How many seconds does it take for the supplies to crash into the ground below?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 46P: In the situation described in Problem 45 and Figure P4.45, the masses of the rope, spring balance,...

See similar textbooks

Similar questions

Two penguins, Wheezy and Mumble, are racing down an icy slope into the water below. Wheezy has a mass of 22 kg. Mumble has a mass of 25 kg. The slope is angled at eight degrees to the horizontal. They both start from the same position at the same time, and slide down the icy slope entirely due to gravity alone. There is a coefficient of kinetic friction of 0.12 between the penguins and the ice. Who wins the race and what is the winner's acceleration when they reach the finish line (ie the water)?
An archer pulls a bowstring back a distance of 20 cm with an average force of 85 N. The arrow has a mass of 20.0 g. When he releases the string, what is the velocity of the arrow when it leaves the bow? 41 m/s 1.2 m/s 39 m/s 32 m/s 22 m/s
A car has a mass of 1750 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 6500 N. If the car is moving at 22 m/s, what is the shortest distance in which the car can stop safely?
A 15g bullet is fired horizontally into a 3 kg block of wood suspended by a long cord. The bullet sticks in the block. Compute the speed of the bullet if the impact causes the block to swing 10cm above its initial level. A. 0.254 km/s B. 0.252 km/ C. 0.281 km/s D. 0.218 km/s
A 1500 kg car traveling at 12 m/s suddenly runs out of gas while approaching the valley shown in the figure. The alert driver immediately puts the car in neutral so that it will roll. What will be the car’s speed as it coasts into the gas station on the other side of the valley?
A bucket of water with a mass of 5 kg is accelerated upward by cord of negligible mass having a breaking strength of 75 N. If the bucket has an initial velocity of 2 m/s, how far will the bucket be raised in 5 s?
Pick an isolated system for the following scenarios while including the fewest number of objects as possible. a. A satellite in orbit around the Earth b. An airplane in flight c. A truck driving along the road d. A person jumping
A large crate of mass m is placed on the flatbed of a truck but not tied down. As the truck accelerates forward with acceleration a, the crate remains at rest relative to the truck. What force causes the crate to accelerate? (a) the normal force (b) the gravitational force (c) the friction force (d) the ma force exerted by the crate (e) No force is required.
An object of mass m1 hangs from a string that passes over a very light fixed pulley P1 as shown in Figure P4.68. The string connects to a second very light pulley P2. A second string passes around this pulley with one end attached to a wall and the other to an object of mass m2 on a frictionless, horizontal table, (a) If a1 and a2, are the accelerations of m1 and m2, respectively, what is the relation between these accelerations? Find expressions for (b) the tensions in the strings and (c) the accelerations a1 and a2? in terms of the masses m1 and m2. and g. Figure P4.68
In the situation described in Problem 45 and Figure P4.45, the masses of the rope, spring balance, and pulley are negligible. Nicks feet are not touching the ground. (a) Assume Nick is momentarily at rest when he stops pulling down on the rope and passes the end of the rope to another child, of weight 440 N, who is standing on the ground next to him. The rope does not break. Describe the ensuing motion. (b) Instead, assume Nick is momentarily at rest when he ties the end of the rope to a strong hook projecting from the tree trunk. Explain why this action can make the rope break. Figure P4.45 Problems 45 and 46.
A block with an initial velocity of 24 m/s slides along a surface with a friction coefficient of 0.30. How far does the block slide before it comes to rest?
A lump of clay of mass 0.31 kg is dropped from a height of 8.1 m. The clay comes to a full stop 0.065 s after the moment it first touched the ground. What is the magnitude in newtons of the average force of impact that the clay experienced? Express your answer in two decimal places, with units of Newtons.