A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street:
a. is less than that observed inside the bus.
b. is the same as that observed inside the bus.
c. is greater than that observed inside the bus.
d. may be either greater or smaller than that observed inside the bus.
e. may be either greater, smaller, or equal to that observed inside the bus.
e
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When an unstable W nucleus undergoes gamma decay, the nucleus formed is that of
a. W. b. Os. c. Ta. d. Hf. e. Re.
A large spherical tank is filled with liquid nitrogen at -200ºC. Using an approximation that the elements of the sphere are infinite walls with initial temperature of 10ºC, when the surroundings are at 10ºC as shown, predict the temperature through the wall after 5 minutes using graphical techniques. The tank is 1% carbon steel, 2 cm thick, and the convective heat transfer coefficients are 40 W/m^2 K for air and 60 W/m^2 K for the nitrogen. Also determine the time before the outside wall reaches 5ºC.
A major surprise from space exploration is that ________ exists at the poles of both Mercury and our Moon
Fill in the blank(s) with correct word
Which of the following stars is a luminous red supergiant and is classified M2 Ia?
A) Spica B) Betelgeuse C) Pollux D) Miaplacidus