physics

Some children go tobogganing on an icy hill. The start from the rest at the top of the hill. The toboggan and children have a combined mass of 94 kg. The height of the first hill a is 12.0m the height of b is 0, and the height of c is 3.0m. If friction is small enough to be ignored , apply the law of conservation of energy to determine
A) the total mechanical energy of the toboggan at a relative to b
B) the sped of the toboggan at b
C) the speed of the toboggan at c

  1. 👍 0
  2. 👎 0
  3. 👁 1,179
  1. E = (1/2) m v^2 + m g h = constant forever in this problem
    mass does not matter here, cancels

    E = m g (12) forever

    m g (12) = (1/2) m v^2 + m g(0) at b
    12 * 9.8 = (1/2) v^2 solve for v at b

    m g (12) = (1/2) m v^2 + m g (3)
    9 * 9.8 = (1/2) m v^2 solve for v at c

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A skier starts from rest at the top of a hill that is inclined at 9.5° with respect to the horizontal. The hillside is 225 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the

  2. physics

    A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as the drawing illustrates. The crest of the second hill is circular, with a radius of 39.6 m. Neglect friction and air

  3. Physics

    A car of mass 1100 kg starts from rest at sea level and climbs a hill of altitude 50 m. At the top of the hill the car has a speed of 25 m/s. From the top of the hill the driver turns off the engine and coasts down to an altitude

  4. physics

    A sled slides without friction down a small, ice-covered hill. If the sled starts from rest at the top of the hill, its speed at the bottom is 7.60 m/s. What is the height of the hill?

  1. science

    A small hockey puck slides without friction over the icy hill and lands 6.20 m from the foot of the cliff with no air resistance.What is its initial speed v0 at the bottom of the hill?

  2. Science

    A sled and rider with a combined weight of 59 kg are at rest on the top of a hill 24 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding

  3. physics

    1. A football player initially at rest accelerates uniformly as she runs down the field, travelling 17 m [E] in 3.8 s. What is her final velocity? 2. A child on a toboggan sits at rest on the top of a tobogganing hill. If the

  4. physics!!!

    a sled and rider with a combined weight of 60kg are at rest on top of a hill 12m high.what is the total energy at the top of the hill?

  1. Precalc

    A surveyor wants to find the height of a hill. He determines that the angle of elevation to the top of the hill is 50° . He then walks 40 feet farther from the base from the hill and determines that the angle of elevation to the

  2. 8th grade physical science

    You are on roller blades on top of a small hill. Your PE is 1,000.0 Joules. The last time you check your mass was 60.0 kg. What is the height of the hill? if you start skating down this hill, your poetntial energy will be

  3. physics

    A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill, as the drawing illustrates. The crest of the second hill is circular, with a radius of 38.1 m. Neglect friction and air

  4. physics

    please show me in steps how to solve this thanks alot! A bobsled zips down an ice track, starting from rest at the top of a hill with a vertical height of 150m. Disregarding friction, what is the velocity of the bobsled at the

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