A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 200 m. Neglect friction
(a) What is the total mechanical energy of the roller coaster at point A?
(b) What is the total mechanical energy of the roller coaster at point B?
(c) What is the speed of the roller coaster at point B?
(d) What is the speed of the roller coaster at point C?
What will be an ideal response?
Answer: (a) 1.73 × 105 J (b) 1.73 × 105 J (c) 65.7 m/s (d) 34.4 m/s
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A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
A. a net force to the left. B. a net force to the right. C. a net force upwards. D. no net force but a slight shift of the inner conductor to the left and the outer conductor to the right. E. no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.
One mole of an ideal gas is held at a constant volume of 1 liter. Find the change in pressure if the temperature increases by 50°C
a. 3 atm b. 4 atm c. 2 atm d. 1 atm e. 5 atm
In the Copernican system, Earth moves slower along its orbit than the planets that lie farther from the Sun
a. True b. False Indicate whether the statement is true or false
What is the energy of the first rotational state of the hydrogen (H2) molecule? The separation between the protons is 10?10 m and the mass of each proton is 1.67 × 10^?27 kg. (h = 6.626 × 10^?34 J ? s and 1 eV = 1.6 × 10^?19 J.)