(Figure 1) shows five electric charges. Four charges with the magnitude of the charge 2.0 nC form a square with the size a = 1.0 cm. Positive charge with the magnitude of q = 7.0 nC is placed in the center of the square. Part A What is the magnitude of the force on the 7.0 nC charge in the middle of the figure due to the four other charges? Express your answer with the appropriate units. Figure y -2.0 nC 2.0 nC a + 9 -2.0 nC 2.0 nC 1 of 1 НА ? Fon q = Value Units Submit Previous Answers Request Answer × Incorrect; Try Again; 4 attempts remaining Part B What is the direction of the force on the 7.0 nC charge in the middle of the figure due to the four other charges? Express your answer in degrees to two significant figures. x 0 = ΜΕ ΑΣΦ Submit Request Answer ? counterclockwise from the positive x-axis

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Problem 71

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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 4,000kg

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