A woman pushes a lawn mower with a force of 80 N. If the handle of the lawn mower is 40° above the horizontal,how much downward force is being exerted on the ground?2.9. An airplane is heading northeast at a velocity of 550 km/h. What is the northward component of its velocity? Theeastward component?2.10 A boat heads northwest at 20 km/h in a river that flows east at 6 km/h. What are the magnitude and direction of theboat's velocity relative to the earth's surface?2.11. An airplane whose velocity is 120 km/h has just taken off from a runway. A car driving at 100 km/h on the runway isable to remain just below the airplane. At what angle is the airplane climbing?2.12. A boat moving at 36 km/h is crossing a river in which the current is flowing at 12 km/h. In what direction should theboat head if it is to reach a point on the other side of the river directly opposite its starting point?2.13. An airplane flies 400 km west from city A to city B, then 300 km northwest to city C, and finally 100 km north tocity D. How far it is from city A to city D? In what direction must the airplane head to return directly to city A fromcity D?2.14. Find the magnitude and direction of the resultant of a 5-N force that acts at an angle of 37° clockwise from the +xaxis, a 3-N force that acts at an angle of 180° clockwise from the +x axis, and a 7-N force that acts at an angle of225° clockwise from the +x axis.2.1Find the magnitude and direction of the resultant of a 60-N force that acts at an angle of 45° clockwise from the +yaxis, a 20-N force that acts at an angle of 90° clockwise from the +y axis, and a 40-N force that acts at an angle of300° clockwise from the +y axis.

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2 A woman pushes a lawn mower with a force of 80 N. If the handle of the lawn mower is 40° above the horizontal, how much downward force is being exerted on the ground? 2.9. An airplane is heading northeast at a velocity of 550 km/h. What is the northward component of its velocity? The

2 A woman pushes a lawn mower with a force of 80 N. If the handle of the lawn mower is 40° above the horizontal, how much downward force is being exerted on the ground? 2.9. An airplane is heading northeast at a velocity of 550 km/h. What is the northward component of its velocity? The

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A tennis player strikes the tennis ball with her racket while the ball is still rising. The ball speed before impact with the racket is v1 = 15 m/s and after impact its speed is v2 = 20 m/s, with directions as shown in the figure. If the 60-g ball is in contact with the racket for 0.047 s, determine the magnitude of the average force R exerted by the racket on the ball. Find the angle β made by R with the horizontal. Comment on the treatment of the ball weight during impact.
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The helicopter flying in Figure 4 with a constant velocity of 180 km/h and is directly above point A when a loose part begins to fall. The part lands 6.5 seconds later at point B on an inclined surface. 16. The vertical motion component of the falling part is A. uniform motion B. non-uniformly accelerated C. uniformly accelerated D. stationary
Consider the 65.0-kg ice skater being pushed by two others shown in Figure 5.19. (a) Find the direction and magnitude of FtotFtot, the total force exerted on her by the others, given that the magnitudes F1F1 and F2F2 are 26.4 N and 18.6 N, respectively. (b) What is her initial acceleration if she is initially stationary and wearing steel-bladed skates that point in the direction of FtotFtot? (c) What is her acceleration assuming she is already moving in the direction of FtotFtot? (Remember that friction always acts in the direction opposite that of motion or attempted motion between surfaces in contact.)
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Q2/ You want to move a 400-N crate across a level floor by pulling upward on the rope at an angle of 30° above the horizontal. How hard must you pull to keep it moving with an acceleration of a = 0.5 m/s² ? Assume that µ = 0.30.
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