When a stone of mass 2.3 kg is dropped from a height of 3.5 m. its speed is 5 ms when hitting the ground What is the work done aganst an resistance? a 78.89 J Select one Ob 50.14 J c 28.75J Od 53.82 J
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- You are standing still on a bathroom scale. The scale shows your weight 140 lbs. How much is the support force? A. ZERO B. 140 x 9.8 m/s^2 C. 140N D. 140 lbs Then choose all that apply to centripetal force. A. Gravitational and electrical forces can produce centripetal forces. B. Centripetal force depends on tangential spreed and radius of curvature . C. twice the radius needs half the centripetal force. D. Measured in the units of N or kg m/s^2 E. Any type of force directed towards a fixed center. F. Twice the speed needs four times the centripetal force. G. Centripetal force depends on the mass, tangential speed and radius of the curvature.QUESTION 19 A 5.0-kg object is executing simple harmonic motion, while attached to a spring that obeys Hooke's law, according the the graph below. What is the value of the spring constant? x (m) t (s) 1Zach, whose mass is 70 kg, is in an elevator going up at a constant speed of 2.0 m/s. Match the answers with questions. Use g = 10.0 m/s². vious Question What is the net force on Zach? A. -70 kg B. -700 N C. -140 N D. 700 N E. ON F. 140 N G. 70 kg What is the weight force on Zach? (This is Zach's true weight.) What is the normal force on Zach? (This is Zach's apparent weight.)