An air-track cart is attached to a spring and completes one oscillation every 5.67 s in simple harmonic motion. At time t = 0.00 s the cart is released at the position x = +0.250 m. What is the position of the cart when t = 29.6 s?
A) x = 0.0461 m B) x = -0.218 m C) x = 0.218 m D) x = 0.342 m E) x = 0.210 m
A
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In a solar hot-water system, the hot-water tank is maintained at 130°C. It is desired to have the solar heater heat the feed water going into the tank to 180°C. Determine the amount of heat per kilogram of water required from the solar heater to heat the water from 130°C to 180°C. Assume that the hot-water heater runs at constant pressure.
What will be an ideal response?
Which of the following best describes what we mean by the focal plane of a telescope?
A) It is the upper surface of the telescope's primary lens or mirror. B) It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope. C) It is the lower surface of the telescope's primary lens or mirror. D) It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view.
A moving bicycle exhibits less stability when the angular momentum of the wheels is less, which means
A. the inverse of the forward speed equals the torque. B. its forward speed is also slower. C. its forward speed is faster.
A long conducting bar moves with a constant velocity in a uniform magnetic field. The bar and its velocity are perpendicular to the magnetic field as shown. Which of the following statements are true?
A. At steady state there is an electric field in the bar.
B. At steady state there is a current in the bar.
C. At steady state there is a magnetic force on bar.