Physics, 05.07.2019 02:20 angelthompson2018
Aperson is standing on an elevator initially at rest at the first floor of a high building. the elevator then begins to ascend to the sixth floor, which is a known distance h above the starting point. the elevator undergoes an unknown constant acceleration of magnitude a for a given time interval t. then the elevator moves at a constant velocity for a time interval 4t. finally the elevator brakes with an acceleration of magnitude a, (the same magnitude as the initial acceleration), for a time interval t until stopping at the sixth floor (a) make a sketch of the velocity v(t) of the elevator as it travels to the sixth floor. your sketch should be qualitatively correct: it should have the right shape, but the vertical scale need not be accurate. hint: thinking about the graphical representation of v(t) leads to a much easier solution for part b. (b) find the value of a, the magnitude of the acceleration, in terms of h and t.
Answers: 1
Physics, 22.06.2019 20:40
Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.
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Physics, 22.06.2019 21:30
What describes the formation of horizon b? a. forms at the surface b. features parent material c. undergoes the most change d. forms due to decomposed material i think the answer is c. undergoes the most change
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Physics, 22.06.2019 22:00
If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?
Answers: 1
Aperson is standing on an elevator initially at rest at the first floor of a high building. the elev...
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