What is the power output in unit of Watts for a 69-kg woman who runs up...
What is the power output in unit of Watts for a 69-kg woman who runs up a 49 m high flight of stairs in 10.6 s, starting from vi=1.6 m/s but having a final speed of vf=7.1 m/? Use g=10 m/s.
Homework Answers
We known that power is given by:
P = Increase in Total energy /time
= [ mgh + 0.5mvf^2- 0.5mvi^2]/t where symbols have usual meanings.
= [69*10*49+0.5*69*7.1^2-0.5*69*1.6^2]/10.6
= 3345 W answer
Add Answer to:
What is the power output in unit of Watts for a 69-kg woman who
runs up...
12 A 60.0-kg woman who runs up a 3.00 m high flight of stairs in 3.50...
12 A 60.0-kg woman who runs up a 3.00 m high flight of stairs in 3.50 s, starting from rest but having a final speed of 2.00 m/s? What is the final potential energy. A) 126 J B) 110W C) 153 J D) 120 J E) 140 J 13 A 100 g ball move upward with a velocity of 10 m/s from ground level in a free fall movement. What is the kinetic energy for the ball at ground level?
9. A 51-kg woman runs up a flight of stairs in 5.0 s. Her net upward...
9. A 51-kg woman runs up a flight of stairs in 5.0 s. Her net upward displacement is 5.0 m. Approximately, what average power did the woman exert while she was running? B) 1.0 kW C) 0.75 kW D) 0.50 k W E) 0.25 kW 군 S.0 99.He lu
QUESTION 10 Power, P, is defined as the rate at which work, W, is done, or...
QUESTION 10 Power, P, is defined as the rate at which work, W, is done, or the work divided by the time, t, over which that work occurs: P = W / t. Starting from rest, at the bottom of a flight of stairs, what is the power output for a person of mass 55 kg who runs up a flight of stairs of height 3.0 m and reaches the top of the stairs, in a time of 3.0 s,...
As part of her morning jog, a 65-kg woman runs up a flight of steps with...
As part of her morning jog, a 65-kg woman runs up a flight of steps with a vertical height of 10 meters. She accomplishes this task in 15.0 seconds. a) What is the weight of the woman? b) How much work did the woman use to climb the stairs? c) What is her increase in potential energy? d) How much power did she use to climb the stairs? e) How much horsepower did she use?
A 65 kg students runs up a flight of stairs (14 stairs with each stair 22...
A 65 kg students runs up a flight of stairs (14 stairs with each stair 22 cm tall) in 2.2 s. What minimum power is expended to reach the top of the flight?
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800...
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (b) What does it cost (in cents), if electricity is $0.0900 per kw-h? cents Additional Materials...
A 52 kg sprinter, starting from rest, runs 60 m in 7.1 s with a constant...
A 52 kg sprinter, starting from rest, runs 60 m in 7.1 s with a constant acceleration. How much work does the sprinter do during the final 2.0 s of his run? What is the sprinter's average power output during the final 2.0 s ?
Question 3 (1 point) [YVEVLXSIAZ] In the Unit 3, Activity 8 - Power Activity, students learned...
Question 3 (1 point) [YVEVLXSIAZ] In the Unit 3, Activity 8 - Power Activity, students learned about the rate of energy transfer also known as power. In a classic experiment, Robert Downey Jr. (78 kg) and Chris Hemsworth (91 kg) are racing up a flight of 10 stairs. Each stair is 19.7 cm high. If Chris Hemsworth manages to get up the stairs is 11.5 seconds and Robert Downey Jr. takes 8.1 seconds, who measures the greatest power? (This question...
3) 3) A 20-kg object is resting at the top of a table 1.6 m above...
3) 3) A 20-kg object is resting at the top of a table 1.6 m above ground level. The object is then picked up and moved to a height of 8.7 m above ground level. What is the change in the gravitational potential energy of this object? 4) 4) A car on a roller coaster starts at zero speed at an elevation above the ground of 26 m. It coasts down a slope, and then climbs a hill. The top...
The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. The winner's ma...
The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. The winner's mass was 60 kg. If each floor was 3.7 m high, what was the winner's change in gravitational potential energy? If the efficiency in climbing stairs is 25 %, what total energy did the winner expend during the race? How many food Calories did the winner "burn" during the race? What was the winner's metabolic power...
9. A 51-kg woman runs up a flight of stairs in 5.0 s. Her net upward displacement is 5.0 m. Approximately, what average power did the woman exert while she was running? B) 1.0 kW C) 0.75 kW D) 0.50 k W E) 0.25 kW 군 S.0 99.He lu
As part of her morning jog, a 65-kg woman runs up a flight of steps with a vertical height of 10 meters. She accomplishes this task in 15.0 seconds. a) What is the weight of the woman? b) How much work did the woman use to climb the stairs? c) What is her increase in potential energy? d) How much power did she use to climb the stairs? e) How much horsepower did she use?
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (b) What does it cost (in cents), if electricity is $0.0900 per kw-h? cents Additional Materials...
Question 3 (1 point) [YVEVLXSIAZ] In the Unit 3, Activity 8 - Power Activity, students learned about the rate of energy transfer also known as power. In a classic experiment, Robert Downey Jr. (78 kg) and Chris Hemsworth (91 kg) are racing up a flight of 10 stairs. Each stair is 19.7 cm high. If Chris Hemsworth manages to get up the stairs is 11.5 seconds and Robert Downey Jr. takes 8.1 seconds, who measures the greatest power? (This question...
3) 3) A 20-kg object is resting at the top of a table 1.6 m above ground level. The object is then picked up and moved to a height of 8.7 m above ground level. What is the change in the gravitational potential energy of this object? 4) 4) A car on a roller coaster starts at zero speed at an elevation above the ground of 26 m. It coasts down a slope, and then climbs a hill. The top...
Most questions answered within 3 hours.
-
After watching the lectures I am still having a hard time
understanding these equations.
1. The...
asked 28 minutes ago -
Testing:
H0:μ=56.9
H1:μ<56.9
Your sample consists of 23 subjects, with a mean of 56.3 and
standard...
asked 31 minutes ago -
straight wire, labeled as Wire A, lies horizontally on a
tabletop and is oriented to run...
asked 32 minutes ago -
For a Chi-Squared Goodness of Fit Test about a uniform
distribution, complete the table.
Round to...
asked 59 minutes ago -
Milk of magnesia is only slightly soluble in water. Kc for the
reaction Mg(OHs)(s)>Mg2+(a) + 2OH-1(aq)...
asked 54 minutes ago -
Excel's HYPGEOM.DIST function can be used to compute _____.
a. both hypergeometric probabilities and cumulative
hypergeometric...
asked 1 hour ago -
The rocket used for the human lunar missions was the Saturn V
rocket. At liftoff the...
asked 57 minutes ago -
1. The East Street Bagel Shop has a weekly demand for 3,500
bagels, which they make...
asked 59 minutes ago -
paraphrasing each paragraph
“Where two or more persons knowingly act together unlawfully,
the act of each...
asked 1 hour ago -
The lateral line system in fish is contained which of the
following?
chemoreceptors
photoreceptors
mechanoreceptors
odor...
asked 1 hour ago -
Find the y-intercept of y =-5 x. The y-intercept of y equals
negative 5 x is______...
asked 1 hour ago -
Customers arrive randomly at a gas station at the average rate
of 30 per hour, while...
asked 1 hour ago