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- PW-3 An elevator motor is capable of lifting a 2,500kg elevator 50.0m with a constant speed in 12.0 seconds. a) Apply Fet ma to find the force needed to lift the elevator. b) Find the power of the elevator motor in watts and in horsepower. (1H.P.-750W) c) If the power of the elevator motor is 200H.P., find the constant speed at which the 2,500kg elevator can be raised. d) If the power of the elevator motor is 200H.P., find the constant speed at which the elevator can be raised if the elevator and its contents have a mass of 4,000kgQUESTION 1 а) 0.32 m h. (a) (b) Figure 1 Figure 1 shows a 1.30 kg steel ball drop from 0.32 m height onto a spring. The spring later experiences maximum compression, x. Given the spring constant, k is 1850 N/m, h, is initial height of the steel ball from the ground, 0.52 m and h, is the original length of the vertical spring. i. Write the equation of conservation energy experience by the steel ball just before it hits the spring as shown in Figure 1(a). ii. Calculate the total energy of the system. iii. Determine the maximum compression, x of the spring. Cmmm9. From the second law of motion and the equation for velocity EF=ma Derive the Work - Energy equation: = 1 + 2a(x₂-x1) W = K₂-K₁
- A child of mass m = 16 kg slides down a slide of height h = 2.7 m without friction. Let gravitational potential energy be zero at ground level. a)Write an expression for the child's total mechanical energy, E, at the top of the slide, in terms of the variables in the problem and the acceleration due to gravity g. b)Calculate the change in the child's potential energy, ΔU in joules, from the top to the bottom of the slide at ground level (i.e. ΔU = Uground - Utop). c)What is the child's final speed, vf in m/s?RYZEN A car is moving along a road at 25.0 m/s with an engine that exerts a force of 2,475.0 N on the car to balance the drag and friction so that the car maintains a constant speed. What is the power output of the engine? Your Answer: Fn NVIDIA Answer Type here to search alexa ENABLED units C 86°F Mostly sunny 4 10:32 AM ASUS ZenBook 14 13 14" Display in 13" Chassis Ultrafast PCIe SSD HDMI 92% Screen-to- Body Ratio Military- QuaQuestion 4 How much power is required to lift a heavy solid concrete beam with mass 119.69 kg upward with a constant speed of 8.9 m/s using a crane? P = watts. Input only the number. Round off to the nearest whole number. A Moving to the next question prevents changes to this answer. 30°C acer 3ms FHD 44HZ F1L F12 F10 F7 FB Scr Lk FS F6 F3 Pause Jシ ト F1 F2 Esc &T @ 并 7 4 2 W E R T. Q IL Lock A F ט
- A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N force inclined at 30° above the horizontal. a. draw all other forces acting ont eh block. b. Calculate the work done by Fa . c. What is the net work done by all forces on the box? A calculation is not needed, but explain your logic.6. A ski starts from rest and slides down 20° incline 100 m long (a) If the coefficient of friction is 0.090, what is the ski's speed at the base of the incline? (b) If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level? Use energy methods.Answer both or NONE Question1 - For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic energy, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, 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. Question2 - For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. How much thermal energy is created in this process, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, 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.
- A water pump draws water from a pit that is 11.5 m deep at a rate of 685 kg/min. The water ejects above the ground surface at a speed of 20.0m/s, making a vertical fountain. 1. Figure out what the power output is of the pump 2. How high is the fountain? Make sure to Ignore air resistance!A car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?A center throws a basketball m = 1 kg straight up with an initial speed of vo = 9.5 m's. He releases the ball at shoulder | height ho = 1.9 m. Let gravitational potential energy be zero at ground level. Give the total mechanical energy of the ball E in terms of maximum height h it reaches, the mass m, and the gravitational acceleration g. E= What is the height, hm in meters? 9 HOME