Plz
a group of students performed an experiment to prove the law of conservation of ene...
Plz
a group of students performed an experiment to prove the law of conservation of energy. in the experiment, a flask containing water at room temperature was shaken vigorously for a few minutes. the table shows a partial record of the temperature of the water before and after shaking.
experimental record
temperature
before shaking 21 °c
after shaking unknown
what best predicts the unknown temperature? (3 points)
less than 21 °c because heat energy is formed from the energy used in shaking
greater than 21 °c because heat energy is formed from the energy used in shaking
less than 21 °c, because the total energy of the system after shaking is higher than before shaking
greater than 21 °c, because the total energy of the system after shaking is higher than before shaking
9.
(01.04 hc)
the table shows the potential energy and kinetic energy of a skier at two different positions on a hill.
position and energy
position (above ground) kinetic energy potential energy
100 meters 0 units 50,000 units
60 meters ? 30,000 units
what is the kinetic energy of the skier at a height of 60 meters above ground? (3 points)
20,000 units, because total energy remains unchanged
80,000 units, because total energy remains unchanged
20,000 units, because total energy of the skier decreases
80,000 units, because total energy of the skier decreases
Answers: 1
Chemistry, 22.06.2019 18:00
How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.
Answers: 3
Chemistry, 22.06.2019 18:30
Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.
Answers: 3
Chemistry, 22.06.2019 21:00
The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?
Answers: 1
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