2 of A 4.2-g locust reaches a speed of 2.8 m/s during its jump. Part A What is its kinetic energy at this speed? Express your answer to two significant figures and include the appropriate units. i HẢ E) ? KE = Value Units Submit Request Answer Part B If the locust transforms energy with 35% efficiency, how much energy is required for the jump? Express your answer to two significant figures and include the appropriate units. Erequired = Value Units
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- A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a constant force F (31 N)i – (35 N); to the cart as it undergoes a displacement 3 = (-9.3 m)î – (2.5 m)3. Part A How much work does the force you apply do on the grocery cart? Express your answer in joules. ? W = J10. A machine is used to move a 700 N object by 2.00 m by exerting 400 N of force through a distance of 10.0 m. a. What is the work input? b. What is the work output? c. What is the efficiency of the machine? PadaPlease help w part B. TIA
- Which of the following statements about energy is not true? a. The mechanical energy of a physical system is constant when the forces acting on the system are all conservative forces. b. The total energy of the universe is always conserved. c. According to the work-energy theorem, the forces that contribute to the net work include all the conservative and nonconservative forces. d. Mechanical energy is always conserved e. Energy can change form, but it cannot be created or destroyed.Because dissipative work, which is negative, converts mechanical energy into a thermal energy, Q, if we write Wats= Q, the above equation becomes %3D (KE + PE). +Wais = (KE+ PE)rmal +Q initial final Problems Work and Energy 1. A box is being moved to the right at a constant velocity v by a force P (parallel to v) along a level horizontal floor. The normal force is FN, the kinetic frictional force is fk, and the weight of the box is mg. (a) Draw a free-body diagram of this situation. +y +x (b) Decide which forces do positive, zero and negative work. Give your reasoning.Part d
- Which statement best describes how power and work are related?Hint 1 A small block of mass 246 g starts at rest at A, slides to B where its speed is vg = 5.4 m/s, then slides along the horizontal surface a distance 10 m before coming to rest at C. A 4.0 m B -10 m- Image Description a. What is the work of friction along the curved surface? W; J b. What is the coefficient of kinetic friction along the horizontal surface? Submit QuestionAnswer both or NONE Part 1 - A 75 kg sprinter accelerates from 0 to 8.0 m/s in 5.0 s. What is the metabolic energy, in kJ (kiloJoules)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Part 2- A 75 kg sprinter accelerates from 0 to 8.0 m/s in 5.0 s. What is the metabolic power, in kW (kiloWatts)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.
- Q1/ Correct the following statements (True/False). 1. Energy is not equal to the work done. 2. The amount of kinetic energy depends only on the mass. 3. Energy has the same quantity if any type of force is applied. 4. potential energy can be calculated at the ground level (horizontal). 5. Mechanical energy can change into heat because of conservative force.Question has TWO parts Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Part A - A 75 kg sprinter accelerates from 0 to 8.0 m/s in 5.0 s. What is the metabolic energy, in kJ (kiloJoules)? Part B - A 75 kg sprinter accelerates from 0 to 8.0 m/s in 5.0 s. What is the metabolic power, in kW (kiloWatts)?How much work must you do to push a 12.0 kgkg block of steel across a steel table (μkμk = 0.60) at a steady speed of 1.20 m/sm/s for 5.30 ss ? Express your answer with the appropriate units. What is your power output while doing so? Express your answer with the appropriate units.