*122. On earth a block has a weight of 88 N. This block is sliding ona horizontal surface on the moon, where the acceleration due to gravity is1.60 m/s?. As the figure shows, the block is being pulled by a horizontalrope in which the tension is T = 24 N. The coefficient of kinetic frictionbetween the block and the surface is µ = 0.20. Concepts: (i) Which ofNewton's laws of motion provides the best way to determine the accel-eration of the block? (ii) Does the net force in the x direction equal thetension T? Calculations: Determine the acceleration of the block.T+yFNmg"moon(b) Free-body diagram for the block

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Answered: *122. On earth a block has a weight of…

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

Chapter5: More Applications Of Newton’s Laws

Section: Chapter Questions

Problem 42P

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A box with mass m1 = 6.00 kg sliding on a rough table with a coefficient of kinetic friction of 0.220 is connected by a mass-less cord strung over a mass-less, frictionless pulley to a second box of mass m2 = 12.0 kg hanging from the side of the table (Fig. P5.51). What is the tension in the cord connecting the boxes?
A 9.00-kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table (Fig. P5.7). Taking the coefficient of kinetic friction as 0.200, find the tension in the string. Figure P5.7
A 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.
Kinetic friction is proportional to the normal force (Eq. 5.9). Why should there be an intimate connection between these two forces?
Two forces F1 and F2 act on a 5.00-kg object. Taking F1 = 20.0 N and F2 = 15.0 N, find the accelerations of the object for the configurations of forces shown in parts (a) and (b) of Figure P4.7. Figure P4.7
In Example 4.6, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.50 s and comes to rest. What does the spring scale register (a) before the elevator starts to move, (b) during the first 0.800 s, (c) while the elevator is traveling at constant speed, and (d) during the time interval it is slowing down?
Two boxes with masses m1 = 4.00 kg and m2 = 10.0 kg are attached by a massless cord passing over a frictionless pulley as shown in Figure P5.79. The incline is frictionless, and = 30.0. a. Draw a free-body diagram for each of the boxes. b. What is the magnitude of the acceleration of the boxes? c. What is the tension in the cord connecting the boxes? d. What is the speed of each of the boxes 3.00 s after the system is released from rest? FIGURE P5.79
A block with mass mb=7.75 kg is suspended on a string. You pull upwards on the string creating a tension force of magnitude TYb=79.2275 N. If the upward speed of the block is 2.25 m/s right now, then what is its speed 5.5 s later?
A runner, is travelling at 7.18 m/s. Turning into the final straight, they accelerate at a constant 1.7 m/s2. Their mass is 61 kg. Neglecting air resistance, what horizontal force (in kN) does the track exert on them? Enter the numerical part of your answer, rounded to two significant figures.
Biologists have estimated the drag coefficient of a swimming penguin by observing the rate at which a penguin’s speed decreases in its glide phase, when it’s not actively swimming and is slowing down. In one study, a gliding 4.8 kg Gentoo penguin has an acceleration of -0.52 m/s2 when its speed is 1.60 m/s. If its frontal area is 0.020 m2, what is the penguin’s drag coefficient?
A uniform push of 150 N, applied at an angle of 30 deg to a 20 kg block which rests on a horizontal surface, gives the block a velocity of 6.5 m/s in 4 s. Find the coefficient of kinetic friction a. 0.77 b. 0.36 c. 0.60 d. 0.80
A 3.69x103 kg train is moving at a constant speed of 10m/s on a horizontal railroad track that offers an overall frictional force of 500N. Calculate (a) it's acceleration, (b) the engine force, (c) the distance traveled in 20 seconds, (d) its acceleration if it changes its speed to 30 m/s, (e) the engine force in this case?

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