# physics

A man whose mass is 75kg walks up a stairs each 20cm high in5seconds.calculate the power expended in watts.[assume g=10m\s2

1. 👍 2
2. 👎 0
3. 👁 1,359
1. 20cm/step
12 steps?.
d = 20 * 12 = 240cm. = 2.40m.

P = F * d/t = Mg * d/t.
P = 750 * 2.4/5 = 360 J/s = 360 Watts.

1. 👍 4
2. 👎 0
2. Yeah i think its the right one

1. 👍 1
2. 👎 1
3. You are an Ewuinma

1. 👍 1
2. 👎 1

## Similar Questions

1. ### PHYSICS

Calculate the power output of a 1.3-g fly as it walks straight up a windowpane at 2.5 cm/s

2. ### University of jos,physics

A man walks 3m north then 4m east.calculate his displacement from the starting point.

1.) Two people of the same mass climb the same flight of stairs. The first person climbs the stairs in 25 s; the second person does so in 35 s. a) Which person does more work?Explain b) Which person produces more power?Explain 2.)

4. ### physics

A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s. The stairs are angled at 45° pointing in the direction of motion as shown in figure below. Write the vector velocity of

1. ### Physics

A machine of efficiency 80% is used to raise a load of body of mass 75kg through a vertical height of 3m in 30seconds.Calculate the power input.

2. ### physics

a 60kg man is on a steadily rotating Ferris wheel. the man is standing on a bathroom scale and the scale reads 45kg at the top of the wheel. take g=10m/s^2 (a) what does the scale read when the man is at the bottom of the wheel?

3. ### physics

A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 m above the street level. (a) How many joules of work has he done? (b) By how much has he increased his potential energy? (c) If

4. ### physics

a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings

1. ### physics

A woman with a mass of 65kg climbs a set of stairs that are 3m high. How much gravitational potential energy does she gain? Thank you.

2. ### physics

During a workout, the football players at State U. ran up the stadium stairs in 61 s. The stairs are 145 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, estimate the average power output on the

3. ### science

a man with a mass of 90,6 kg walks to the back of a train at a velocity of 1m/s while the train moves at a constant velocity of 36km/h in a easterly direction. what is the weight of the man

4. ### physics

You have a mass of 60 kg and run up some stairs that are 5 m high in 6 seconds. How much power did you produce?