Physics, 28.06.2019 22:20 izabelllreyes
Arock is sliding down a hill. assume that the hill is 20 meters high and the rock has a mass of 1,000 kilograms. if the rock started at the top of the hill with no initial speed, how much is its kinetic energy when it reaches the bottom of the hill? use g=10 m/s2. give the answer in kilojoules.
Answers: 3
Physics, 22.06.2019 01:30
Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz
Answers: 3
Physics, 22.06.2019 01:30
Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.
Answers: 1
Physics, 22.06.2019 08:50
You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a Ć b = 98k. what is the y-component of vector b?
Answers: 1
Arock is sliding down a hill. assume that the hill is 20 meters high and the rock has a mass of 1,00...
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