All categories

3 years ago

A 60-kg woman runs up a staircase 15 m high (vertically) in 20 s.

Physics

1 answer:

erma4kov [3.2K]3 years ago

4 0

Answer:

(a) 441 W (b) 0.59 hP

Explanation:

Given that,

Mass of a woman, m = 60 kg

Height of a staircase, h = 15 m

Time, t = 20 s

(a) We need to find the power she expend. Work done per unit time is called power. It is given by :

$P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{60\times 9.8\times 15}{20}\\\\P=441\ W$

( b) Since, 1 hP = 745.7 W

P = 0.59 hP

You might be interested in

A gamma ray with an energy of 3.40 × 10-14 joules strikes a photographic plate. We know that Planck's constant is 6.63 × 10-34 j

suter [353]

The correct answer is: "A. 5.13 x 10^19 hertz"

4 0

3 years ago

Read 2 more answers

The following acceleration vs time plots show

fenix001 [56]

The data set that is most likely from the car equipped with ABS is :

The First ( upper ) plot

Although the plots related to your question is missing attached below is the missing data.

The First plot ( acceleration vs time ) plot is the data that represents the application of brakes in a car fitted with ABS ( antilock braking system ) because of the absence of skidding effect between 6.5 and 9 seconds in the graph.

The skidding effect is present in the second plot around the same time because the car is not fitted with ABS

Hence we can conclude that the graph that shows the car fitted with ABS is the first plot .

Learn more : brainly.com/question/4360615

7 0

2 years ago

How come that there is a presence of cos there?

liubo4ka [24]

Answer:

Can i have more context

Explanation:

8 0

3 years ago

At which of the following points does a roller coaster have the most potential energy? As it is going down a hill. At the top of

vova2212 [387]

Answer:

At the top of the hill.

Explanation:

As the roller coaster goes up the hill, kinetic energy (K.E) decreases, gravitational potential energy (G.P.E) increases .

As it reach the top of the hill, K.E becomes zero and G.P.E reaches maximum .

As it goes down the hill, K.E starts to increase and G.P.E decrease .

At the bottom of the hill, K.E reaches maximum and G.P.E becomes zero .

(Correct me it I am wrong)

6 0

2 years ago

What type of simple machine is found in a wheelbarrow? Lever Wedge

Semenov [28]

Answer: Lever

A wheelbarrow consists of a lever to be able to lift the material, and a wheel to be able to move it horizontally. So in a sense, a wheelbarrow is a complex machine consisting of two simple machines.

8 0

2 years ago

Read 2 more answers