Related questions
Question
thumb_up100%
1. Kenny is climbing the stairs of his apartment building for exercise. Kenny weighs 83 kg. There are 8 steps in each flight and the height of a single step on the staircase is 11 inches. He climbs the flight of stairs in 3.4 seconds.
a.) calculate the long-term rate at which stairs can be climbed considering the given information.(how long can be sustained in stair per second)
b.) Why does Kenny descend stairs at a faster rate for a nearly unlimited time although very similar forces are exerted descending as they are ascending?(This points to a fundamentally different process for descending versus climbing stairs.)
Expert Solution
arrow_forward
Step 1
Given data:
The height of each step is 11 inches and there are 8 steps in each staircase.
Total height is .
He climbs this height in 3.4 seconds.
Therefore his velocity is
Each step is 11 inches, 0.2794 m. Time to sustain in the stair per second is
Step by stepSolved in 2 steps
Knowledge Booster
Similar questions
- One afternoon, a student was going home after attending a calculus class. For this reason, the student orders an online motorcycle taxi through the application. At the time of ordering, the online motorcycle taxi is in the position s = 2t² + 2t+4, where t is in units of time and s is in meters. a. Determine the average speed of the online motorcycle taxi at intervals of 3 minutes to 5 minutes. b. Determine the time when the instantaneous speed of the online motorcycle taxi is exactly the same as the average speed. NEED IN RUSH THANKSarrow_forwardPlease answer the following question(s): 1. The speed of a boat in still water is vá. A river flows with a speed of v₁. The boat travels distance of 19 miles downstream in a river in 1 hour. However, the return journey takes 2 hours. Calculate the vand v₁. Hint: Velocity=displacement/time. Displacement can be positive of neagtive depending on the direction. You will first need to set up the equations by taking into account the resultant velocity of the boat in flowing water. Consider the direction the river is flowing to be positive. Set up two equations, one for the downstream journey and one for the upstream journey, in terms of "v" and "v": Do v" and "v, add or substract downstream to give the resultant downstream velocity? Do v" and "v, add or substract upstream togive the resultant upstream velocity? Use the upstream direction as negative. The resultant upstream velocity should be negative. vb vb Downstream positive Vr Upstream negative Vrarrow_forward1,2arrow_forward
- A rubber ball rebounds to 0.72 of the height from which it has dropped. It is first dropped from aheight of 6 meters onto level ground. a. After 2 bounces, what height does it rebound? Draw a sketch to help you. b. After how many bounces does it first rebound to a height less than 1 meter? (deals with sequences and series)arrow_forwardSOLVE STEP BY STEP IN DIGITAL FORMAT 14. If the speed in (m/s) that a certain athlete reaches in a 200-meter race is described by the function v(x) =-0.005x(x - 300), where x is the recommended distance. a) What distance has the athlete traveled when he reaches his maximum speed?b) What is the maximum speed he reaches?arrow_forwardCan you help with d.arrow_forward
- During 55 successive 1.001.00 min intervals, a runner moves at the following constant speeds: 0.4000.400 km/min, 0.2000.200 km/min, 0.1100.110 km/min, 0.1100.110 km/min, and 0.3600.360 km/min. a.) Find the total distance traveled. b.) Find the average speed.arrow_forwardPhysics questionarrow_forward2. A car is traveling at a speed of 31 m/s. a. What is its speed in kilometers per hour? b. Is it exceeding the 90 km/h speed limit?arrow_forward
- 3. A tennis ball is thrown up in the air. It's height is given by h(t) = -5t2 + 23t + 2, where h(t) is in meters and t is in seconds. Use technology to answer: a.) What is the max height of the tennis ball? When does it occur? b.) How long was the tennis ball in the air?arrow_forward6. A train is moving with a constant speed. The train moves 60 meters for every 1.5 seconds that elapses. a. Assume that we get 40 by dividing 60 by 1.5. What is the name that is commonly given to a quantity represented by this number 40? b. To denote the quantity completely, what additional information must be given besides the number 40? c. How would you interpret the number 40 in this instance? Your answer should mention distance and time. d. Use your interpretation (not algebra) to find the distance the train moves in 2.5 seconds.arrow_forward2 2. A ball is thrown upward from the top of a 6 feet tall platform. The ball is 30 feet off the ground after 1 second and 22 feet off the ground after 2 seconds. The height h above ground is a quadratic function of the time t after the ball is thrown. a) What is the equation that fits this model? b) How long after the ball is thrown will it reach its maximum height? 2 decimals c) What is the maximum height the ball reaches? Answer Answer Answerarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios