4.1 Calculate the magnitude of the acceleration of the car, 4.2 Calculate the magnitude of the resultant force acting on the car during the 6 s.
Question 7
A force of 190
Question 5
illustrated in th
experiences a
Two crates weighing 50kg are connected with a thick inextensible rope, as illustrated in the
diagram below. A force of 1500 N is applied on the crates in an easterly direction. The crales
move with an acceleration of 7 m. s? to the right
1500N
50 kg
50 kB
7.1
Dra
Ca
Calculate;
7.2
f
5.1 the magniłude and direction of the frictional force experienced by the crates.
5.2 the magnitude of the lension in the rope.
7.3​

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

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs