Physics, 11.12.2019 16:31 eternelle1182
Apoliceman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 41.2 khz. a car is approaching him at a speed of 33.0 m/s. the wave is reflected by the car and interferes with the emitted sound producing beats. what is the frequency of the beats? the speed of sound in air is 330 m/s.
Answers: 3
Physics, 22.06.2019 14:30
When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?
Answers: 3
Physics, 22.06.2019 18:00
Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?
Answers: 1
Physics, 22.06.2019 23:00
Awelder using a tank of volume 7.50Ă10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30Ă10^5 pa and temperature of 37.1 âc. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 âc, the gauge pressure of the oxygen in the tank is 2.00Ă10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.
Answers: 3
Physics, 22.06.2019 23:30
You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the personâs average speed in kilometers per hour?
Answers: 3
Apoliceman in a stationary car measures the speed of approaching cars by means of an ultrasonic devi...
Mathematics, 24.09.2021 09:50
English, 24.09.2021 09:50
Mathematics, 24.09.2021 09:50
Mathematics, 24.09.2021 09:50
Social Studies, 24.09.2021 09:50
Chemistry, 24.09.2021 09:50
Mathematics, 24.09.2021 09:50
English, 24.09.2021 09:50
Mathematics, 24.09.2021 09:50
Mathematics, 24.09.2021 09:50
History, 24.09.2021 09:50