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. 👍 4
  2. 👎 0
  3. 👁 1,640
  1. The height is
    h = 20•0.1 = 2 m
    The work is W = mgh =350•2 = 700 J
    Power = Work/time = 700/10 =70 W

    1. 👍 6
    2. 👎 1
  2. A 40kilowatt electric cable ??$ used to transmit electricity through a resistor of resistance 2ohms at 800 volts, the power loss at energy is? Pls show workings

    1. 👍 0
    2. 👎 0
  3. A generator ??$ on daily use in the process 106kw ????? 540w tungsten box are on force the same time interval. Thee energy consumed is

    1. 👍 0
    2. 👎 0
  4. a person with a mass of 40 kg runs up a flight of stairs in 12 seconds the flight has 20 steps and the height of each step is 20cm

    1. 👍 0
    2. 👎 1
  5. 133.33 W

    1. 👍 0
    2. 👎 2
  6. 13.33 W

    1. 👍 0
    2. 👎 2

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    At what rate is a 60.0-kg boy using energy when he sprints up a flight of stairs 10.0 m high in 8.00 s? A. 75.0 W B. 48.0 W C. 735 W D. 480 W E. 4.80 kW

  2. Language Arts

    Read this excerpt from A Girl from Yamhill. In the morning I descended from the bedroom by sliding down the banister railing, which curved at the end to make a flat landing place just right for my bottom. At night I climbed the

  3. Physics ~please help me~

    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. math

    a rabbit climb up a flight of 10 stairs and can only hop 1 or 2 steps each time. he never hops down, only up. How many ways can the rabbit hop up the flight of 10 steps?

  1. 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

  2. PHYSICS

    A) The average power output of the human heart is 1.33 watts. How much energy does the heart produce in a day? B) Compare the energy found in part (a) with the energy required to walk up a flight of stairs. Estimate the height a

  3. Physics

    A woman runs up a flight of stairs. The gain in her gravitational potential energy is 6500 J. If she runs up the stairs at half the speed, what is her gain in gravitational potential energy?

  4. physics

    A boy of mass 50kg runs up a set of stairs of total height of 3.0m.find the work done against gravity

  1. math

    Ariana runs up 4 flights of stairs and then runs down 4 flights of stairs. Does this situation represent additive inverses? Explain.

  2. science

    A 80 kg firefighter climbs flight of stairs 6 meter high in 10 seconds. How much work is required by the firefighter?

  3. physics

    a boy runs 100m along the east,then he turns to his left side at right angle and runs for 50m along the north direction.find the distance and the magnitude of the displacement .

  4. Physics

    A girl whose weight is 30 N runs up a flight of stairs 5 m in 6 s. What is her average power

You can view more similar questions or ask a new question.