Answers: 1
Physics, 21.06.2019 18:10
Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if ฮป = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.
Answers: 1
Physics, 21.06.2019 23:20
In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 โ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30โ from horizontal. what is the weight of the rider? express your answer with the appropriate units.
Answers: 1
Physics, 22.06.2019 07:30
Quantum mechanics applies to subatomic, atomic, nanometer-size, and micrometer-size systems. nanometer, micrometer, and kilometer-size systems. atomic, nanometer-size, and micrometer-size systems. subatomic, atomic, and nanometer-size systems.
Answers: 2
An electron has an negative charge. what is true about the charge of a particle that is attracted to...
Biology, 16.10.2020 05:01
Biology, 16.10.2020 05:01
Social Studies, 16.10.2020 05:01
Mathematics, 16.10.2020 05:01
English, 16.10.2020 05:01
History, 16.10.2020 05:01
Biology, 16.10.2020 05:01
Geography, 16.10.2020 05:01
History, 16.10.2020 05:01
Chemistry, 16.10.2020 05:01
Social Studies, 16.10.2020 05:01