32miles/hr
Explanation:
Given parameters:
Distance 1 = 60miles
Time 1 = 2hrs
Distance 2 = 68miles
Time 2 = 2hrs
Unknown:
Average speed of the car = ?
Solution:
Average speed is the total distance covered in a particular duration of time.
Average speed = 
Total time taken = time 1 + time 2 = 2hrs + 2hrs = 4hrs
Total distance = distance 1 + distance 2 = 60miles + 68miles = 128miles
Average speed = 
= 32miles/hr
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Answer:
When we see a region of a planet that is not as heavily cratered as other regions, it means that the surface of that region is younger.
Explanation:
There are a number of processes that affect planetary surfaces like erosion, volcanism, plate tectonics and the amount of craters by impact of meteorites.
The density of craters in a given region suggests the age of the surface. If the surface is saturated by craters then is likely very old because a long time should have passed for the planet to be hit by so many meteorites. If there are very few craters this may indicate that the surface is quite young, because the other processes described above wouldn't have had enough time to erase them. In any case we need to study the change of the cratering rate over time to determine the age of a given surface.
Answer:
Temporary? You have two options
If you have a positively charged object, bring it close to the LEFT side of the ball (not touching it!).
If you have a negatively charged object, bring it close to the RIGHT side of the ball (again, not in contact).
Either way, the electron cloud will migrate towards the right side of the of your sphere.
Another option is to have a capacitor large enough to house the sphere inside it, and polarize it by attaching it to a DC source making sure that the negative plate of it is to the right of the sphere.
Answer:
Conduction heat transfer is the transfer of <em>heat by means of molecular excitement within a material without bulk motion</em> of the matter.
Explanation:
Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during heir random motion.
