Only 4 questions !

1. what accomplishment from the space industry benefits society?
a. developing a more powerful rocket booster
b. the successful launch of communication satellites
c. zero-g toilets
d. better spacesuits

2. which of the following is a reason for the start of the space race?
a. too many scientists were unemployed.
b. congress was very interested in outer space.
c. the u. s. president was a science fiction fan.
d. the united states wanted to beat the soviet union to the moon.

3. which of the following benefits has florida experienced from space exploration?
a. space exploration has developed better spacesuits.
b. we know more about deep-space objects.
c. space exploration has changed the culture.
d. we have toilets that work without gravity. question

4. which of the following statements is true of space exploration?
a. space exploration is too expensive to be of any good to society.
b. space exploration has given society many technological advances.
c. space exploration is not based on science.
d. space exploration is too limited to benefit society.

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?