The Flintstones and Rubbles decide to try out the new inclined bowling alley, ``Bedslant Bowling''. Betty's ball and Wilma's ball have the same size, but Wilma's ball is hollow. Fred's ball and Barney's ball are scaled down versions of Betty's ball and Wilma's ball respectively. They all place their bowling balls on the same pitch incline and release them from rest at the same time. Answer choices are (greater than, less than or equal to)
a) The time it takes for Wilma's ball to hit the pins is that for Barney's ball to hit.
b) The time it takes for Barney's ball to hit the pins is that for Fred's ball to hit.
c) The time it takes for Betty's ball to hit the pins is that for Fred's ball to hit.
d) The time it takes for Betty's ball to hit the pins is that for Barney's ball to hit.
e) The time it takes for Fred's ball to hit the pins is that for Wilma's ball to hit.
f) The time it takes for Wilma's ball to hit the pins is that for Betty's ball to hit.

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?