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    What was the speed of the projectile when it left the cannon?

    Homework Statement A projectile is shot from the surface of te Earth by means of a very powerful cannon. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? a. 355 m/s b. 827 m/s c. 710 m/s d. 906 m/s...
  2. M

    Earth to the Moon power help

    Homework Statement The amount of energy required to get a spacecraft from the Earth to the Moon a. is greater than the energy required to go from the Moon to Earth. b. is the same as the energy required to go from the Moon to Earth. c. is less than the energy required to go from the Moon...
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    Potential Energy and Conservation of energy

    Homework Statement How does the work required to stretch a spring 2cm compare with the work required to stretch a spring 1 cm? Homework Equations ? The Attempt at a Solution i think its twice the work
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    Forces doing work

    Homework Statement A box is being pulled up a rough incline by a rope connected to a pulley as shown below. The arrows indicate the direction of motion of the blocks. How many forces are doing work on the box? (view attachement) Homework Equations different forces must be taken into...
  5. M

    Work and kinetic energy of two blocks

    Homework Statement Two blocks of mass m1 and m2 (m1 > m2) slide on a frictionless floor and have the same kinetic energy when they hit a long rough stretch (coeff. of kinetic friction > 0), which slows them down to a stop. Which one goes farther? Homework Equations W = Fd..iono...
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