Which force is always attractive and has a very small range? strong nuclear weak nuclear gravitational electromagnetic

19. Jupiter and Saturn are both mainly composed of: helium and hydrogen. nitrogen and carbon dioxide. neon and freon. carbon and silicon.

What does nuclear fusion in stars create? Chemical compounds Black holes New elements Asteroids

If the temperature is $-55^{\circ }F,$ what is the corresponding temperature on the Kelvin scale? 225 K 218 K 55 K 328 K

Which of the following statements about the violent events on the Sun called flares is FALSE? a. flares happen more often during solar maximum and sometimes during those periods, there can be several in one day b. a flare can release energy equivalent to a million hydrogen bombs c. flares originate in the upper part of the corona, in the regions called coronal holes d. astronomers think that flares are connected with sudden changes in the magnetic field of the Sun e. the visible light we see from a flare is only a tiny fraction of the energy it releases

As astronomers have learned more about the structure of the Sun, they have found that it a. has a small solid core inside b. is made entirely of liquid, with a tiny bit of hot gas on the outside c. is solid throughout.but with a large very hot atmosphere d. is made entirely of hot gas e. is made of billions of individual pieces of hot rock, all orbiting around each other in a whirling arrangement

Sunspots are darker than the regions of the Sun around them because a. they consist of different elements than the rest of the Sun b. they are located in the corona and not on the photosphere c. they move much faster around the Sun than other material and thus heat up d. they are the shadows of the planets and asteroids seen on the bright surface of the Sun e. they are cooler than the material around them (although still very hot compared to Earth temperatures)

55. ... Acceleration is related to velocity and time by the following expression: $a=v^{p}t^{q}$ Find the powers p and q that make this equation dimensionally consistent.

What element/isotope is used as a fuel source within most nuclear power plants? biomass Plutonium-239 Uranium-235 nitrates sulfur oxides

A cell phone falls off a balcony. It's height (in feet)is given by the formula $f(t)=-16t^{2}+13.4t+150$ , where t is measured in seconds. How long will it take the cell phone to hit the ground? Round your answers to three decimal places.

What is the de Broglie wavelength of a 11.5 g hummingbird flying at 100. mph? Round your answer to 3 significant digits. $1mile=1.6093km$