The alarm at a fire station rings and a 94.3-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.38 m). Just before landing, his speed is 1.28 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole? Number eTextbook and Media Units

The alarm at a fire station rings and a 94.3-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.38 m). Just before landing, his speed is 1.28 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole? Number eTextbook and Media Units

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 8P: A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3...

See similar textbooks

Similar questions

A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3 + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.00 s.
In baseball, a pitcher can accelerate a 0.15-kg ball from rest to 98 mi>h in a distance of 1.7 m. (a) What isthe average force exerted on the ball during the pitch? (b) If themass of the ball is increased, is the force required of the pitcherincreased, decreased, or unchanged? Explain.
A little toy car is powered by a CO2 cartridge that produces a thrust force according to the following function: Fthrust(t) = 6.0N e-0.2t. The car also has a friction coefficient of 0.05 due to the wheels and bearings. If the car's mass is 1.2kg, and the car travels in the +x direction, what will it's acceleration function look like as a function of time? If it starts from rest, what will vx(t) be? How fast will the car be going after 3.0s? What maximum speed will be reached by the car?
Dr. Jekyll (m = 70kg) is riding a skateboard when he realizes the cranberry juice he’s drinking is sweetened with artificial sweetener and turns into Mr. Hyde (m = 155kg). If Dr. Jekyll was initially moving at 6.5m/s, what is Mr. Hyde’s speed? (assume no external forces act)
Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted anormal force of approximately 260,000 N on its torso as it landed.Assuming the torso has a mass of 3800 kg, (a) find the magnitudeof the torso’s upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7g.)(b) Assuming the torso of a T. rex is in free fall for a distance of 1.46m as it falls to the ground, how much time is required for the torsoto come to rest once it contacts the ground?
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?
A 63.0 kgkg parachutist falling vertically at a speed of 6.50 m/sm/s hits the ground, which brings him to a complete stop in a distance of 0.87 mm (roughly half of his height). 1) Assuming constant acceleration after his feet first touch the ground, what is the average force exerted on the parachutist by the ground? Express your answer with the appropriate units.
A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge slanted at an angle of 20° (see figure below). Suppose the system of blocks is initially held motionless and, when released, begins to accelerate. (a) If m1 = 6.75 kg, m2 = 3.00 kg, and the magnitude of the acceleration of the blocks is 0.170 m/s2, find the magnitude of the kinetic frictional force between the second block and the ledge. _________ N(b) What is the value of the coefficient of kinetic friction between the block and the ledge? __________ Please show work! Thanks.
A man is texting on his phone as he drives his car at 40 kmph, he suddenly notices a child is crossing the road so he rams his brake bringing the car to stop in 2s. If the car’s mass is 4000 kg and he weighs 60 kg, what was the retarding force on the car?
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.
A lady pulls a cart with a force of 1800 N. Neglecting friction, if the cart changes from resting to a speed of 1.25 m/s in a distance of 0.2 m, what is the total mass of the cart? Show detailed solution. a. 715 kg c. 480 kgb. 460 kg d. 220 kg
A 4.0kg object is moving across a friction-free surface with a constant velocity of 2ms–1. How much the horizontal forces is needed to maintain this state of motion?