Two ropes are connected to a 200 kg dinghy. Two brothers each take one rope and pull. When the brothers pull in the same direction, the dinghy accelerates at a rate of 1.33 m/s2 to the east. If they pull in opposite directions, the dinghy has an acceleration of 0.514 m/s2 to the west. Assume the ropes are horizontal, and ignore any other horizontal forces acting on the dinghy..

a) What is the magnitude of the force each brother exerts on the dinghy? (Assume each magnitude is constant in either direction.)

larger force N

smaller force N

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Amoving freight car collides with an identical one that is at rest. if momentum is conserved, what happens to the second car after the collision? it attains the same speed as the first car. it moves at half the speed of the first car. it moves at twice the speed of the first car.

2.which choice most accurately explains what happens to the bonds between atoms when water changes to steam, and what becomes of the energy added during this phase change? when water changes to steam bonds between molecules are created. after reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms. when water changes to steam bonds between molecules break apart. after reaching the boiling point, energy is used to break bonds, but does not affect the kinetic energy of the atoms. when water changes to steam bonds between molecules are created. after reaching the boiling point, energy is used to break bonds, but does not affect the kinetic energy of the atoms. when water changes to steam bonds between molecules break apart. after reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms.