Help this is an exam
...
Answers: 1
Physics, 22.06.2019 02:10
How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by
Answers: 2
Physics, 22.06.2019 18:00
The protons in a nucleus are approximately 2 β 10^β15 m apart. consider the case where the protons are a distance d = 1.93 β 10^β15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.
Answers: 1
Physics, 22.06.2019 23:20
Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above
Answers: 2
Physics, 23.06.2019 01:00
The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?
Answers: 3
Mathematics, 20.09.2019 21:30
Computers and Technology, 20.09.2019 21:30
World Languages, 20.09.2019 21:30
Business, 20.09.2019 21:30
Mathematics, 20.09.2019 21:30
Spanish, 20.09.2019 21:30
Mathematics, 20.09.2019 21:30
Mathematics, 20.09.2019 21:30
Business, 20.09.2019 21:30
English, 20.09.2019 21:30
English, 20.09.2019 21:30
Mathematics, 20.09.2019 21:30
Physics, 20.09.2019 21:30
World Languages, 20.09.2019 21:30