(1)(3)(4)The figure shows overhead views of four situations in which forces act on a block that lies on africtionless floor. If the force magnitudes are chosen properly, in which situations are itpossible that the block is moving with a constant velocity? *2 and 4All of themNone of themOnly 2

net force Fnet→=f1→+f2→+f3→ Direct addition will be done using unit vector notation Diya solution…

Answered: (1) (3) (4) The figure shows overhead…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter8: Linear Momentum And Collisions

Section: Chapter Questions

Problem 8PE: Professional Application A car moving at 10 m/s crashes into a tree and stops in 0.26 s. Calculate...

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The parameters of instantaneous speed, altitude, net engine thrust, and wind speed are given for the aircraft, which accelerates and moves at a fixed altitude of 5000 kg, while leaving a load of 150 kg. In case the air friction is neglected, calculate the distance between the load and the aircraft while falling to the ground.
The resultant of three coplanar-concurrent forces is 200lb 90°. Determine the value and direction of the third force if F1 = 500lb due W and F2 = 240lb 30° S of W
As a fish jumps vertically out of the water, assume thatonly two significant forces act on it: an upward force F exertedby the tail fin and the downward force due to gravity. A recordChinook salmon has a length of 1.50 m and a mass of 61.0 kg.If this fish is moving upward at 3.00 m/s as its head first breaksthe surface and has an upward speed of 6.00 m/s after twothirdsof its length has left the surface, assume constant accelerationand determine (a) the salmon’s acceleration and (b)the magnitude of the force F during this interval.
A car of mass 1000 kg is moving with a velocity of 10m/s and is acted upon by a forward force of 1000 N due engine and retarding force of 600N due to friction . What will be its velocity after 10 seconds ?
Describe a situation in which the net external force on a system is not zero, yet its speed remains constant.
Most of us know intuitively that in a head-on colli-sion between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Whyis this? Many people imagine that the collision forceexerted on the car is much greater than that exerted onthe truck. To substantiate this view, they point out that thecar is crushed, whereas the truck is only dented. This ideaof unequal forces, of course, is false; Newton’s third lawtells us that both objects are acted upon by forces of thesame magnitude. The truck suffers less damage because it is made of stronger metal. But what about the two driv-ers? Do they experience the same forces? To answer this question, suppose that each vehicle is initially moving at 8.00 m/s and that they undergo a perfectly inelastic head-on collision. Each driver has mass 80.0 kg. Including the masses of the drivers, the total masses of the vehicles are 800 kg for the car and 4 000 kg for the truck. If the colli-sion time is 0.120 s, what…
The parameters of instantaneous speed, altitude, net engine thrust and wind speed are given for the above 5000 kg aircraft, which accelerates and moves at a fixed altitude, while leaving a load of 150 kg. In case the air friction is neglected, calculate the distance between the load and the aircraft while falling to the ground.
Two ice skaters stand together as illustrated in Fig. 3.28. They push off and travel directly away from each other, the boy with a velocity of 0.50 m/s to the left. If the boy weighs 735 N and the girl weighs 490 N, what is the girls velocity after they push off? (Consider the ice to be frictionless.)
A 65-kg person jumps from the first floor window of a burning building and lands almost vertically on the ground with a horizontal velocity of 3 m/s and vertical velocity of -9 m/s. Upon impact with the ground he is brought to rest in a short time. The force experienced by his feet depends on whether he keeps his knees stiff or bends them. Find the force on his feet in each case. a. First find the impulse on the person from the impact on the ground. Calculate both its magnitude and direction. b. Find the average force on the feet if the person keeps his leg stiff and straight and his center of mass drops by only 1 cm vertically and 1 cm horizontally during the impact. c. Find the average force on the feet if the person bends his legs throughout the impact so that his center of mass drops by 50 cm vertically and 5 cm horizontally during the impact. d. Compare the results of part (b) and (c), and draw conclusions about which way is better. You will need to find the time the impact lasts by making reasonable assumptions about the deceleration. Although the force is not constant during the impact, working with constant average force for this problem is acceptable.
Professional Application A car moving at 10 m/s crashes into a tree and stops in 0.26 s. Calculate the force the seat belt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 70 kg.
A particle of mass m has speed υ = α/x, where x is its displacement. Find the force F(x) responsible.
What is the condition for motion when more than one force acts?

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