PHYS 120 Lecture 4: Newton's Laws (Solutions)

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silvertermite629

14 Dec 2017

School

Simon Fraser University

Department

Physics

Course

PHYS 120

Professor

Sarah Johnson

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Document Summary

A jet with mass m = 7x104 kg accelerates down the runway for takeoff at 2. 1 m/s2. Once off the ground, the plane climbs upward for 20 seconds. During this time, the vertical speed increases from zero to 24 m/s, while the horizontal speed increases from 80 m/s to 92 m/s. After reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 11 seconds. What is the net vertical force on the airplane as it levels off: newton"s laws page 1. Three blocks, each of mass 7 kg are on a frictionless table. A hand pushes on the left most box (a) such that the three boxes accelerate in the positive horizontal direction as shown at a rate of a = 1. 1 m/s2. What is the horizontal force on block b due to block c: newton"s laws page 2.

Related Questions

Clear the Runway

To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and the wind velocity.

(a) A plane accelerates from rest at a constant rate of 5.00 m/s2 along a runway that is 1800 m long. Assume that the plane reaches the required takeoff velocity at the end of the runway. What is the time t needed to take off?

Express your answer in seconds using three significant figures.

(b) What is the speed vTO of the plane as it takes off?

Express your answer numerically in meters per second using three significant figures.

Express your answer numerically in meters using three significant figures.

(d) What is the distance dlast traveled by plane in the last second before taking off?

Express your answer numerically in meters using three significant figures.

(e) What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway?

Express your answer numerically to the nearest percent.

taupegnu252

Before takeoff on an airplane, an inquisitive student on the plane dangles an iPod by its earphone wire. It hangs straight down as the plane is at rest waiting to take off. The plane then gains speed rapidly as it moves down the runway, (i) Relative to the student's hand, does the iPod (a) shift toward the front of the plane. (b) continue to hang straight down, or (c) shift toward the back of the plane? (ii) The speed of the plane increases at a constant rate over a time interval of several seconds. During this interval, does the angle the earphone wire makes with the vertical (a) increase, (b) slay constant, or (c) decrease?

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PHYS 120 Lecture 4: Newton's Laws (Solutions)

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