A 70 kg firefighter slides, from rest, 4.3 m down a vertical pole. (a) If the firefighter holds onto the pole lightly, so that the frictional force of the pole on her is negligible, what is her speed just before reaching the ground floor? (b) If the firefighter grasps the pole more firmly as she slides, so that the average frictional force of the pole on her is 500 N upward, what is her speed just before reaching the ground floor?

A 70 kg firefighter slides, from rest, 4.3 m down a vertical pole. (a) If the firefighter holds onto the pole lightly, so that the frictional force of the pole on her is negligible, what is her speed just before reaching the ground floor? (b) If the firefighter grasps the pole more firmly as she slides, so that the average frictional force of the pole on her is 500 N upward, what is her speed just before reaching the ground floor?

Name: A 70 kg firefighter slides, from rest, 4.3 m down a vertical pole. (a)
Uploaded: 2024-03-20T06:57:25.000Z
Channel: Bartleby
Description: A 70 kg firefighter slides, from rest, 4.3 m down a vertical pole. (a) If the firefighter holds onto the pole lightly, so that the frictional force of the pole on her is negligible, what is her speed just before reaching the ground floor? (b) If the

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

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 2OQ: An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward....

See similar textbooks

Similar questions

An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. What maximum height does she reach? (a) 13 m (b) 2.3 m (c) 3.7 m (d) 0.27 m (e) The answer cant be determined because the mass of the athlete isnt given.
A bowling ball is dropped from the top of a building that has a height of h = 112 m. Part (a) Assuming air resistance is negligible, what is the ball's speed, vf in m/s, when it strikes the ground?Part (b) If drag produces an opposing force of 10 N while the ball's falling, what is the ball's speed, vf in m/s, when it strikes the ground? Assume the ball has a mass of 5 kg.Part (c) A different ball was dropped and the final speed was measured to be vf = 8.5 m/s while the drag force was measured to be 50 Newtons. What is the mass of this ball in kg?
A 75-kg snowboarder has an initial velocity of 5 m/s and slides down a 92-m-long straight incline from an initial height 54 m and finally comes to rest after sliding horizontally a distance x. The coefficients of kinetic friction are 0.15 and 0.18 on the slope and on the horizontal surface, respectively. (a) What is his velocity at the bottom of the slope? 33.00577 X m/s (b) What is x? m
The friction force that a horizontal surface exerts on a 62 kg object is 23 N. If the initial speed of the object is 27 m/s, what distance will it slide before coming to a stop?
An 80 kg skier sliding across a flat smooth ice surface at 20 m/s reaches a flat muddy surface with a coefficient friction of 1.2. How far does she travel before stopping
If the motor exerts a constant force of 300 N on the cable, determine the speed (ft/s) of the 20-kg crate when it travels s = 10 m up the plane, starting from rest. The coefficient of kinetic friction between the crate and the plane is u = 0.3
A 1400 kg car, starting from rest, accelerates to a speed of 30 mph in 10 s. (a) What is the force on the car (assumed constant) during this time period? (b) Where does this force come from, that is, what is the (external) object that exerts this force on the car and what is the nature of this force?is responsible for providing the energy necessary to turn the wheels, but without an interaction with the external environment, there would be no motion). (c) Draw a free-body diagram for the car. Indicate the direction of motion and the direction of acceleration. Now suppose that the driver, traveling at 30 mph, sees a red light ahead and pushes the brake pedal. Assume that the coefficient of static friction between the tires and the road is µe = 0, 7, and that the wheels do not "lock up," that is, they continue to roll without slipping on the road as the speeddecreases. (d) Draw a free-body diagram of the car and (e) determine the minimum stopping distance of the car? Again, indicate the…
A 1400 kg car, starting from rest, accelerates to a speed of 30 mph in 10 s. (a) What is the force on the car (assumed constant) during this time period? (b) Where does this force come from, that is, what is the (external) object that exerts this force on the car and what is the nature of this force?is responsible for providing the energy necessary to turn the wheels, but without an interaction with the external environment, there would be no motion). (c) Draw a free-body diagram for the car. Indicate the direction of motion and the direction of acceleration. Now suppose that the driver, traveling at 30 mph, sees a red light ahead and pushes the brake pedal. Assume that the coefficient of static friction between the tires and the road is µe = 0, 7, and that the wheels do not "lock up," that is, they continue to roll without slipping on the road as the speeddecreases. (d) Draw a free-body diagram of the car and (e) determine the minimum stopping distance of the car? Again, indicate the…
A block slides down a frictionless inclined ramp. If the ramp angle is 19.0° and the length of it is 4.45 m find the speed of the block as it reaches the end of the ramp, assuming it started sliding from rest at the top. (ramp angle is the angle that the ramp made with the horizontal line, the length is measured along the ramp), g=9.8m/s2, the block has a mass of 9.3 kg.
Somone is standing on a piece of cardboard holding a wire that is attached to a vehicle. The friction between the cardboard and road is 67N. The wire makes a 24° angle with the road. The tension on the wire is 134N. If they start from rest how long does it take them to reach a speed of 14m/s and how far have they traveled? The mass of the person and the cardboard is 80kg
A constant applied force F, of 13.0 N pushes a box with a mass m = 6.00 kg a distance x = 15.0 m across a level floor. The coefficient of kinetic friction between the box and the floor is 0.130. F, Assuming that the box starts from rest, what is the final velocity vf of the box at the 15.0 m point? Uf = m/s If there were no friction between the box and the floor, what applied force Fnew would give the box the same final velocity? Fney O20°C 87
Tom reached a speed of 29 m/s in the downhill skiing competition. Suppose he left the slope at that speed and then slid freely along a horizontal surface. If the coefficient of kinetic friction between his feet and the ground was 0.27 and his final speed was half of his initial speed, find the distance he traveled?