A 1300-kg car travelled from 10 to 60 km/h on an uphill road with a vertical rise of 30 m. Question i)List the appropriate energies involved with their formulas.
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A 1300-kg car travelled from 10 to 60 km/h on an uphill road with a vertical rise of 30 m.
Question
i)List the appropriate energies involved with their formulas.
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- What can be said about the speed of a particle if the net work done on it is zero? explain brieflyA 58-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.4 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. ____mA 41-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.5 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. m
- What is kinetic energy (KE)? What is potential energy (PE)? Discuss their similarities and differences with appropriate examples.In order not to gain weight, a student of mass m = 80 kg wishes to get rid of the energy gained by eating a hamburger (1600 kJ) by doing push-ups. In each push-up he raises his centre of mass through h = 20 cm For this question you may use g = 10 m/s² (a) How many push-ups must he perform a) How many push-ups must he perform?3. A student drags a 3 kg box 5 m across a rough floor with a force of 40 N. A frictional force of 10 N resists the motion of the box. A) Calculate the work done by the student. B) Calculate the work done by friction. C) Determine the net work done on the box. D) If the box started from rest, how fast is it going at it approaches 5 m? has a yelocity of 8
- i) A small 25g toy rocket is launched straight up from the ground at 144 km/h (a) What is the kinetic energy of the toy rocket? (b) Find the work done by gravity after it has risen 220 m. (i) (a). The kinetic energy of the toy rocket is = (b). The work done by gravity after it has risen 220 m is ="20 kg bear slides, from rest, 12 m down a Lodgepole Pine tree, moving with a speed of 5.6 m/s just before hitting the ground. What change occurs in the gravitational potential energy of the bear Earth system during the slide?" -2352 J O -2250 J O -3330 J Data is not enough to calculate potential energy change O000A bowling ball of mass, M = 2 kg is dropped from a height, h = 0.40 m to the floor. Find the change in the gravitational potential energy of the bawling ball- Earth system, assume g = 10 m/s?. %3D O A) - 4 J O B) 8 J C) - 8 J O D) 02 J E) 4 J Cevabımı Kaydet ve Sonraki Soruya Geç Toplam Soru Sayısı Şuanki Soru Kalan Soru Sayısı Sınav Bitiş Saati 15 12 28.01.2021 13:25
- C7 17.) A 1 kg block (block A) is released from rest at the top of a 20 m long frictionless ramp that is 7 m high. At the same time, an identical block (block B) is released next to the ramp so that it drops straight down the same 7 m. Find the values for each of the following for the blocks just before they reach ground level. (a) gravitational potential energy Block A ______________ J Block B ______________ J (b) kinetic energy Block A ____________________ J Block B ____________________ J (c) speed Block A ____________________ m/s Block B ____________________ m/s (d) momentum Block A _______________________ kg·m/s Block B _______________________ kg·m/sWhen a 12 kg object increases its potential energy by 720 J, approximately how has its position changed? a) It has risen vertically 60m b) It has fallen vertically 6m c) It has risen vertically 6m d) It has fallen vertically 60m(14 The driver of a 1900 kg car (including passengers) traveling at 24.0 m/s slams on the brakes, locking the wheels on the dry pavement. The friction force between tire rubber and dry concrete is 14,000 N. a. Use the work-energy principle to calculate how far the car will travel before stopping. Express your answer with the appropriate units. b. How far would the car travel if it were going twice as fast? Express your answer with the appropriate units.