A car is travelling at a constant speed on a flat road TRUE OR FALSE -the car is in equilibrium (T/F) -the car is accelerating (T/F) -there is a net force on the car (T/F) -there is work being done on the car (T/F)

Total distance = 4 km + 3 km + 5 km = 12km

total time = 1.5 hours

velocity = distance/time
v = 12/1.5
v = 8 km/h

speed = distance/time
s = 12/1.5
s = 8

hope this helps :)

Step 1. he would need to know how much soil was being drained, step 2 he would need to measure whatever was draining the soil so he could stop it, and finally he would need to know how big the object would need to be.

Obviously clay is a material that won't let water drain through it, so the plan would be to substitute it with another material or to reduce the quantity of clay.

The key is in "they lock together". This tells you this is a complete inelastic collision and therefore you can use the formula:
m1*v1+m2*v2=v(m1+m2)
Plug in numbers:
2000*3+2000*2=v(2000+2000)
so v=2 m/s, obviously in the same direction of motion in which they were both moving.

Astronomers find it difficult to detect individual exoplanets because these planets are not bright enough compared to the stars they orbit. 

Light from the stars, because the orbits make it difficult to see them. 

D. All of the above. When a wire loop is moved or rotated in a magnetic field, there is a change in magnetic flux which produces emf in wire loop and hence electric current is produced. 

The answer is D. It is obvious since it is a one-choice question and both A and B state the exact same thing. Therefore the answer has to be D and so C has to be correct as well. Exam techniques! :D

B) obviously. Work in a scientific sense is the ability to make a displacement on an object in this case.

In A) the scientist can work on an experiment as your uncle can work on the field planting tomatos.

Hi

a. the atoms and molecules of a substance are always in motion
b. the higher the temperature of a substance, the faster its particles move
c. more massive particles move more slowly than less massive particles.

these are the main points of kinetic theory of matter.

Kinetic Theory of Matter
The kinetic theory of matter states that all matter is made of small particles that are in random motion and that have space between them. This means that no matter what phase matter is in, it is made of separate, moving particles.
This theory sounds pretty simple, but it actually explains a lot about the physical properties of matter and how it behaves. You might be surprised to learn that the particles of a solid are actually moving, just not enough for you to see. This type of vibrational movement is why a solid won't change shape no matter what kind of container you put it in.
Remember how liquid particles have more energy than solids? The extra energy in this state allows the particles to move around more freely, and they spread out more than those of a solid, putting more space between those particles. This is why a liquid will take the shape of its container up to its surface.
And since gases have even more energy than liquids, their particles are moving around a lot more, too. This is why a gas will expand to fill its entire container, not just to its surface like a liquid. Not only do the particles of a solid not move very much, but they're also held very close to each other by strong attractive forces. These forces are what hold the particles in place and are what give a solid its fixed size and shape.
On the other hand, the particles of a gas are so far apart that the attractive forces between them are assumed to be negligible. The particles of a gas are viewed as independent from each other, meaning that the gas is the opposite of a solid and has neither a fixed size nor shape.
Since the movement of liquid particles is in between a solid and a gas, the attractive forces between its particles are also in a middle range of the other two phases. Liquid particles have more freedom than solid particles, which is why a liquid can flow freely. This means that like a gas, a liquid has no fixed shape. But because the particles aren't quite as free as those of a gas, a liquid does have a fixed volume.

thanks for asking

Momentum conservation in a completely inelastic collision works like this:
mA*vA+mB*vB=v(mA+mB)

Since B was initially stationary pB=0.
Plugging in numbers gives:
5*(-3.2)=v(5+3.9)
v= -1.79 m/s to the left.

A Terrestrial plant, Tell-uric planet, or rock planet is a planet that is composed primarily of silicate rocks or metals.

Dr. Inge discovered the make up of the earths inner core by studying how an earthquakes waves bounced off the core. And Inge Lehmann was studying the waves of a 1929 earthquake when she found them acting inconsistently with solid mantle crust 
hope it helps you