Physics, 28.01.2020 04:31 rakanmadi87
Bio human energy vs. insect energy. for its size, the common flea is one of the most accomplished jumpers in the animal world. a 2.0-mm-long, 0.50-mg flea can reach a height of 20 cm in a single leap. (a) ignoring air drag, what is the takeoff speed of such a flea? (b) calculate the kinetic energy of this flea at takeoff and its kinetic energy per kilogram of mass. (c) if a 65-kg, 2.0-m-tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump, and what takeoff speed would the man need? (d) most humans can jump no more than 60 cm from a crouched start. what is the kinetic energy per kilogram of mass at takeoff for such a 65-kg person? (e) where does the flea store the energy that allows it to make sudden leaps?
Answers: 3
Physics, 21.06.2019 20:00
Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.
Answers: 2
Physics, 22.06.2019 10:40
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
Physics, 22.06.2019 11:00
A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?
Answers: 3
Bio human energy vs. insect energy. for its size, the common flea is one of the most accomplished ju...
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