Answered: a. In a skyscraper, an elevator takes…

a. In a skyscraper, an elevator takes 55 s to descend from the top floor to ground level, a distance of 400 m. What is the average speed of the evelator for this trip?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter1: Introduction To Statics

Section: Chapter Questions

Problem 1.19P: Plot the earths gravitational acceleration g(m/s2) against the height h (km) above the surface of...

See similar textbooks

Related questions

Q: 5. Figure 3, below, shows a rollercoaster ride. The curve of the rollercoaster is given by the…

Q: A Flying toy for children starts from rest at the ground. Accelerate at 4 ft/sec? and then…

Q: The velocity of a boat relative to a fixed-earth coordinate system is 12 m/s and is constant. The…

A: Given: Speed of the boat→Vb=12 m/s Length of the tow rope→L=15 m Initial angle→θ=30° Rate of…

Q: Q1/ A balloon, rising vertically with a velocity of 16m /sec, releases a sandbag at an instant when…

Q: A particle moving along a straight line is subjected to a deceleration a=(−2v3) m/s, where v is in…

A: Given:a=-2 v3 m/s2At t=0,v=8 m/s and s=8 m

Q: A motorcyclist starting from rest travels along a straight ro?d and fo- 10 s has an acceleration as…

Q: A pendulum in your house swings from one side to the other in a span of 0.8 seconds. If this…

A: As per our guidelines we are supposed to answer first question. Please post the question separately.

Q: . If the initial position and initial velocity of a vehicle are known and a record is kept of the…

A: Yes we can compute the vehicle’s position after a certain time.

Q: As the engineer working in a car company, you are assigned to evaluate two new car models, the Car A…

A: Normal speed of an article during a given time stretch is the adjustment of its position partitioned…

Q: 5. A 50 ft. ladder is placed against a large building. The base of the ladder is resting on an oil…

Q: If an objects start a motion from rest with an acceleration of 3 m/s2, find its speed after 10 s.…

A: Given, Initial velocity = u = 0 m/s (As object starts the motion from rest) Acceleration = a = 3…

Q: 5. A small asteroid strikes the surface of Mars and causes a rock to fly upward with a velocity of…

A: AnsDraw the figure for the given condition am = 3.7 m/s2 (a) calculate the maximum height of the…

Q: Figure shows a system consisting of two blocks A and B connected by an inextensible cable that runs…

Q: A body is projected upwards with a velocity of 30 m/s. Find (a) the time when its velocity will be 5…

A: Considering upward direction to be positive, Initial velocity of body = u = 30 m/s Acceleration = a…

Q: A. A falling object requires 1.5 sec to travel the last 30m before hitting the ground. From what…

A: Let us say velocity of an object at the beginning of last 1.5 s was V m/s Now, motion during last…

Q: Q1 (a) Figure Q1 (a) shows a basketball game. The player is trying to shoot the ball at point A, at…

Q: Starting from rest, a rotating shaft speeds up to 2,400 rpm in 6.0 seconds with constant…

Q: A particle moves that is defined by the parametric equations given below (where x and y are in…

Q: Question-2 An elevator whose floor to ceiling height is 2.75m starts ascending with constant upward…

A: (i) Draw the diagram of the system. Write the relative acceleration of the bolt. ar=g+a

Q: engineer working in a car company, you are assigned to evaluate two new car models, the Car A and…

A: Hjaja

Q: An engineer is designing the runway for an airport. Of the planes that will use theairport, the…

A: NOTE: since the plane starts from rest to takeoff , so we consider initial velocity u = 0 m/s final…

Q: A four wheel drive accelerate uniformly from 50Km/hr.to a speed of 80 km/hr. over a distance of…

A: Given Data The initial speed of the wheel drive, u=50 Km/hr u=50×518u=13.88m/s The final speed of…

Q: A watermelon is blown into three pieces by a large firecracker. Two pieces of equal mass m fly away…

A: Initial momentum of the Watermelon is 0. So we use law of conservation of momentum in solving this…

Q: Q5. the acceleration due the gravity on the moon is 1/6 of what it is on earth. If you can throw a…

Q: 3) A small rock is thrown vertically upward with a speed of 18# from the edge of the roof of a 30 –…

A: The rock is thrown upward with an initial speed v0,y=18m/sfrom the initial heighty0=30.0m. The…

Q: A temperature sensor is attached to slider AB which moves back and forth through 60 in. The maximum…

A: Let us consider Slider AB's right motion first. Slider initially is stationary. Then Slider moves…

Q: A creature moves at a speed of 5 furlong per fortnight. Given that 1 furlong = 220 yards and 1…

A: Note: Kindly post different questions seperately, under guidelines,we can solve only first question…

Q: Question 3: When correctly solving problem: "The acceleration of a particle moving along a straight…

Q: 2. Block A (20kg) moved down 2 m in 20 sec starting from rest. Find the final velocity and…

Q: Josh threw the marble vertically upward with a speed of 70 ft/s from a bridge. On the way down, the…

A: Find Height of the bridge

Q: 13. A Navy air-to-air missile is launched from an airplane with a speed of 1100 ft/s. Five seconds…

A: 13. Given, Initail speed of missile,u=1100ft/sFinal speed of missile,v=2460ft/sTime ,t=5secTo…

Q: A burglar car had a start with an acceleration of 2 m/s*A police vigilant party came after 5 seconds…

Q: A burglar car had a start with an acceleration of 2 m/s?.A police vigilant party came after 5…

A: Given Acceleration, a = 2 m/s2 Velocity, v = 20 m/s

Q: A stone is thrown vertically upwards with a velocity 20m/s from the top of a tower 25m high.make…

A: Given data: The initial velocity of the stone is u=20 ms The height of the tower is ht=25 m The…

Q: During a time trial, a car accelerates uniformly from rest over a distance of 680 m, travels a…

Q: A particle travels along the circular path from A to B in 1 s. If it takes 3 s for it to go from A…

A: The average velocity of an item is its displacement over time. To calculate an object's average…

Q: A passenger train passes a certain station at 60 kmph, and covers a distance of 12 km with this…

Q: An aircraft flying at a height of 800m with uniform horizontal velocity of 360km/hr releases a bomb…

Q: A Flying toy for children starts from rest at the ground. Accelerate at 4 ft/sec? and then…

A: α1=A flying toy Acceleration=4 ft/s2α2=A flying toy Decelerate=1.5 ft/s2h=Height from ground=40 ft

Q: A motorboat is traveling at a constant velocity of 6.0 m/s when it starts to decelerate to arrive at…

Q: 6. A F1 car with a speed of 120 km/h goes around a level, circular track with a radius of 1 km. What…

Q: 2. During a standard protocol test of an engineered rocket ship, it travelled upward at 80 m/s and…

Q: subway car leaves station A; it gains speed at the rate of 4ft /s2 for 6 s and then at the rate of…

Q: 1. Situation: You are to determine the duration of the yellow light at a highway intersection.…

Q: A Flying toy for children starts from rest at the ground. Accelerate at 4 ft/sec? and then…

A: Given data: Initial velocity, u=0 ft/sec Aceeleration, a1=4ft/s2 Decceleration, a2=1.5ft/s2 Final…

Q: From a height of 70 ft above ground, an item is flung vertically upward. The object's starting…

Question

100%

a. In a skyscraper, an elevator takes 55 s to descend from the top floor to ground level, a distance of 400 m. What is the average speed of the evelator for this trip?

b. The elevator is at rest at the beginning and at the end of the trip. If you wanted to program the elevator so that it completes the trip in the specified time with a minimum acceleration and a minimum deceleration, how would you have to accelerate and decelerate the elevator? What would be this minimum value of the acceleration and deceleration? What would be the maximum speed during the trip?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Similar questions

1. If the initial position and initial velocity of a vehicle are known and a record is kept of theacceleration at each instant, can you compute the vehicle's position after a certain time fromthese data? If so, explain how this might be done.
As the engineer working in a car company, you are assigned to evaluate two new car models, the Car A and the Car B car variants. The two cars begin their test drive from rest side by side and travel along a straight highway. For 10 seconds, Car A accelerates at 4 m/s2 and then maintains a constant speed. Next, the Car B accelerates at 5 m/s2 until reaching a constant speed of 25 m/s and then maintains this speed. (b)Calculate and sketch the a-t, v-t, and s-t graphs for the Car B until t = 15 s.
To be able to solve rectilinear problems with variable functions. A passenger train passes a certain station at 60 kmph, and covers a distance of 12 km with this speed and then stops at next station 15 km from the first, with uniform retardation. A local train, starting from the first station covers the same distance in double this time and stop at the next station. Determine the maximum speed of the local train which covers a part of the distance, with uniform acceleration and the rest with uniform retardation. Express your answer in km and hr.
A stone is dropped from a balloon that is ascending at uniform rate of 10 m/sec. If it takes the stone 10 sec. to reach the ground, how high was the balloon at the instant the stone was dropped?
Dynamics Blocks move with constant acceleration, if B moves down 40 ft in 5 sec starting with a velocity 4 ft/s downward and A moves upward at 4 ft/s accelerating steadily at 2 ft/s2, determine the displacement, velocity, and acceleration of C at t = 10 sec.
As the engineer working in a car company, you are assigned to evaluate two new car models, the Car A and the Car B car variants. The two cars begin their test drive from rest side by side and travel along a straight highway. For 10 seconds, Car A accelerates at 4 m/s2 and then maintains a constant speed. Next, the Car B accelerates at 5 m/s2 until reaching a constant speed of 25 m/s and then maintains this speed. (a)Calculate and sketch the a-t, v-t, and s-t graphs for the Car A until t = 15 s. (b)Calculate and sketch the a-t, v-t, and s-t graphs for the Car B until t = 15 s.
Two objects moving along x-axis are starting at the same time. Their positions are measured in centimeters at time t in seconds. If the equation of motion of objects 1 and 2 are and respectively, determine the distance between the objects at the instant when they have the same velocity. 2 cm 4 cm 3 cm 1 cm
A. A falling object requires 1.5 sec to travel the last 30m before hitting the ground. From what height above the ground did it fall?
The planets Venus, Earth, and Mars all move in approximately circular orbits around the sun. Use the data in the table to find (a) the speed of each planet in its orbit and (b) the centripetal acceleration of each planet. (c) As the size of a planet’s orbit increases, does the speed increase or decrease? Does the centripetal acceleration increase or decrease?
When a volleyball coach releases a volleyball from a height of 2 m above the gym floor, it falls to the floor and bounces back to two-thirds the same height. When it is in contact with the floor, the lower side of the ball is temporarily flattened. Suppose the maximum depth of the dent is 1 cm. (Assume the positive direction is upward.)1. Determine the acceleration of the ball (in m/s2) while it is in contact with the floor and compressing. (Indicate the direction with the sign of your answer.) 2. Determine the velocity of the ball (in m/s) as it leaves the floor on the rebound. (Indicate the direction with the sign of your answer.) 3. What If? If instead of dropping the ball, the coach throws it down (from some unknown height) with such a speed that it bounces back up to a height three times its original height, determine the new acceleration of the ball (in m/s2) while in contact with the floor and expanding. (Indicate the direction with the sign of your answer.)
A boy throws a ball vertically upward and catches it 1 sec later.(a) How high up did the ball go? (b) With what speed was it thrown upward?
15. An automobile is traveling at 25 m/s. It takes 0.3 sec to apply the brake after which the deceleration is 6 m/s2. How far does the automobile travel before it stops? ANS: 60m 17. Water drips from a faucet at uniform rate of 3 drops per second. Find the distance between 2 successive drops if the upper drop has been in motion ¼ second. ANS: 1.36 m 20. A skier is filmed by a motion picture photographer who notices him traveling down a ski run. The skier travels 36 m during the fourth second of the filming and 48 m during the sixth second. What distance did he cover in the eight seconds of filming? Assume that the acceleration is uniform throughout. ANS: 312 m