State the Principle of Equivalence
What will be an ideal response?
An inertial reference frame in a uniform gravitational field is physically equivalent to a reference frame that is not in a gravitational field, but that is in uniform linear acceleration.
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This figure demonstrates that when the wire on the left is connected from one end of the battery to the other, producing a short circuit, the light goes out. Why does the light go out?
a. The wire causing the short circuit has much less electric resistance than the light bulb, so the voltage stays the same with much less current through the bulb than through the short circuit wire. b. The voltage drops drastically but the resistance across the circuit does not change. c. The current flows almost entirely through the added wire because of its very low resistance, and the voltage also drops drastically. d. The existence of two paths reduces the voltage across the bulb in half. e. The existence of two paths reduces the current through the bulb in half.
Kepler's second law is about the speed of planets, where planets move faster at perihelion and slower at aphelion
a. True b. False Indicate whether the statement is true or false
5 inch diameter spherical oranges are placed in a cooler at 75ºF. The cooler is at 38ºF, the convective heat transfer coefficient is 18 Btu/hr?ft^2 ?ºF and the properties of oranges are the same as water. Determine the time when the surface of the oranges are 40ºF.
What will be an ideal response?
One of the absorption lines of hydrogen has a rest wavelength of 656 nm. Suppose you observe this line in four different stars, and find this line at the wavelengths show below. Which wavelength represents the star that is moving toward Earth the fastest?
A) 630 nm B) 656 nm C) 670 nm D) 640 nm