2). The farther a planet is from the sun, the longer it takes to orbit the sun. Mercury ... 88 days. Earth ... 365 days. Jupiter ... 12 years. Neptune ... 165 years.
3). Mercury & Venus ... no moons Earth - 1 Mars - 2 Jupiter - more than 65
4). Mercury ... cratered, no atmosphere Venus ... cratered, thick cloudy atmosphere Mars ... dry, cratered, slight atmosphere, like 1% or Earth's
Jupiter, Saturn, Uranus, Neptune We can't see any surface. If any of them even HAS a surface, it's thousands of miles under a thick atmosphere of methane gas.
5). Missing from the list
6). Here's a list from the biggest planet to the smallest one. The numbers in parentheses are the radius of the planet -- half of the diameter:
Jupiter (69,911 km / 43,441 miles) – 1,120% the size of Earth Saturn (58,232 km / 36,184 miles) – 945% the size of Earth Uranus (25,362 km / 15,759 miles) – 400% the size of Earth Neptune (24,622 km / 15,299 miles) – 388% the size of Earth Earth (6,371 km / 3,959 miles) Venus (6,052 km / 3,761 miles) – 95% the size of Earth Mars (3,390 km / 2,460 miles) – 53% the size of Earth Mercury (2,440 km / 1,516 miles) – 38% the size of Earth
7). At least seven of the planets rotate in the same direction. There's something different about one of them ... it may be Uranus but I'm not sure. You'll have to look this up.
8). Saturn has the famous rings, that you can almost see with only binoculars. Spacecraft sent to observe the outer planets have detected very thin rings around Uranus and Neptune.
9). Included in #6.
10). I don't have complete info. Generally, the closer the planet is to the sun, the hotter it is. But there are a few exceptions. I think Venus ... the second one from the sun, is actually hotter than Mercury.
11). Just about every language has its own name for each planet.
12). "Terrestrial" means "like Earth" ("Terra"). The terrestrial planets are the ones that have solid surfaces and are made of rock. Mercury, Venus, Earth, and Mars.
13). "Jovian" means "like Jupiter". Either no solid surface, or very small, inside a big deep gas ball. Jupiter, Saturn, Uranus, Neptune.
The spring constant is the force required to stretch or compress a spring divided by the distance traveled by the spring. It is used to determine whether a spring is stable or unstable.
K is the proportionality constant, also known as the 'spring constant.' Hooke's law (F = -kx) specifies stiffness and strength via the k variable. The greater the value of k, the greater the force required to stretch an object to a given length.
Objects with equal speeds definitely have equal velocities. -- FALSE. For equal velocities, they also have to be going in the same direction.
If you are given an object's velocity, you can definitely determine its speed. -- TRUE. If you know the velocity, then you know both the object's speed and its direction.
If you know the distance an object travels, and the time it takes to do so, you can determine the object's velocity. -- FALSE. Knowing the distance and time, you can figure out the object's speed. But if you don't also know the direction it's moving, then you can't say what its velocity is.
If an object moves at constant speed, it must also be moving at constant velocity. -- FALSE. Besides constant speed, it also needs to move in a straight line to have constant velocity. If it turns, its velocity changes, even if its speed doesn't.
If an object moves at constant velocity, it must also be moving at constant speed. -- TRUE. Constant velocity means its speed AND its direction are not changing.
Objects with equal velocities definitely have equal speeds. -- TRUE. If their velocities are equal, then their speeds are equal AND they're moving in the same direction.
After laboring through this one, I'm wondering if there can possibly be any more ways to say the same thing.
