In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
a. Block A has twice as much kinetic energy as block B.
b. Block B has lost twice as much kinetic energy to friction as block A.
c. Block B has lost twice as much kinetic energy as block A.
d. Both blocks have had equal losses of energy to friction.
e. No energy is lost to friction because the ground has no displacement.
d
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Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 1 year B) 6 months C) 2 years D) It cannot be determined from the information given.
A little known fact is that both Robinson Crusoe and Friday wore eyeglasses. As it so happens, Robinson Crusoe was farsighted while Friday was nearsighted
Whose eyeglasses did they use whenever they wanted to start a fire by focusing the sun's rays? A) Robinson Crusoe's B) Friday's C) Both would work equally well. D) Both actually worked, but Friday's was a little bit better. E) Neither's worked, but fortunately they were in possession of matches.
An opaque horizontal plate is insulated on the backside. The plate irradiation is 2500 W/m^2 of which 500 W/m^2 is reflected. The plate temperature is 227ºC and has an emissive power of 1200 W/m^2. Air at 127ºC and with a convective heat transfer coefficient of 12 W/m^2 K flows over the plate. Determine (a) emissivity, absorptivity, and radiosity of the plate and (b) the net heat transfer per unit area.
The leading hemisphere of Iapetus is much darker than the back side, which is icy
Indicate whether the statement is true or false