Physics, 21.03.2020 11:34 user1234536
A hand lifts a block vertically upward at constant velocity. The work done by gravity on the block if the system consists of the block only. The work done by gravity on the block if the system consists of the block and the earth. AND WHY?
1. is zero, is zero2. is zero, is negative3. is zero, is positive4. is negative, is negative5. is positive, is positive
Answers: 2
Physics, 21.06.2019 17:50
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Physics, 22.06.2019 16:50
Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.
Answers: 1
Physics, 22.06.2019 21:50
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Physics, 23.06.2019 00:20
When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve
Answers: 1
A hand lifts a block vertically upward at constant velocity. The work done by gravity on the block...
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