19 Ball & ramp. (4 pts.) A ball of mass M rolls along the flat part of a track with velocity v rightward. It rolls up th

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19 Ball Ramp 4 Pts A Ball Of Mass M Rolls Along The Flat Part Of A Track With Velocity V Rightward It Rolls Up Th 1 (186.89 KiB) Viewed 35 times

19 Ball & ramp. (4 pts.) A ball of mass M rolls along the flat part of a track with velocity v rightward. It rolls up the ramp, ending up at height b, as shown. Imagine there is no friction or air resistance present. Consider repeating this process with a ball with six times the mass. The initial velocity is the same. How does the height change? [If it helps you, write out equations describing the types of energy involved, and solve for h.] A. It becomes 6x as large. D. ... max as large. B.... 36x as large. C. ...x as large. E. It does not change. 20 (4 pts) Electricity. Electrical power transmitted via electrical grids depends on current (I) and voltage (V). Which of the following is true? A. Electrical power is transmitted at high voltages and large currents. B. Electrical power is transmitted at lower voltages and large currents. C. Electrical power is transmitted D. Electrical power is transmitted at low voltages and low currents. E. It doesn't matter whether electrical power is transmitted at high or lower current and voltages, as long as power = current times voltage (P=IV). 21 (3 pts) Electricity. Which statement is correct about alternating current (AC) or direct current (DC)? A. For AC, charge flows in one direction only in a circuit. B. For AC, voltage flows in both directions in a circuit. C. For DC, charge flows back and forth in a circuit. D. For DC, voltage flows back and forth in a circuit. E. For DC, charge flows only in one direction in a circuit.