Answer:
An unbalanced force means that there are more than one forces with different directions or magnitudes affecting the object. In this case, the vector addition of the forces should be done. The vector addition will result a net force. The object will move in the direction of the net force.
Answer:
Zero
Explanation:
Acceleration is rate of change of velocity..
a) Molecules' energy increases cause they consume heat, increase their speed and thus the temperature of the substance increases.
b) For acetone heat of vaporization is 539390 J/kg, for water - 2257000, for aluminum - 1050000 J/kg. We see that hard and dense substances require much more energy to destroy molecular bindings.
c) Q=L*m=333000*3=999000 J.
d) Because while becoming ice water looses energy - this energy represents heat that can warm up the fruits.
the answer would be velocity
This question was apprently selected from the "Sneaky Questions" category.
The store is 3 km from his home, and he walks there with a speed of 6 km/hr. So it takes him (3 km) / (6 km/hr) = 1/2 hour to get to the store.
That's 30 minutes. So the whole part-(a.) of the question refers to only that part of the trip, and we don't care what happens once he reaches the store.
a). Over the first 30 minutes of his travel, Greg walks 3.0 km on a straight road, and he ends up 3.0 km away from where he started.
Average speed = (distance/time) = (3.0 km) / (1/2 hour) = <em>6.0 km/hr</em>
Average velocity = (displacement/time) = (3.0 km) / (1/2 hour) = <em>6.0 km/hr</em>
There's probably some more questions in part-(b.) where you'd need to use Greg's return trip to find the answers, but johnaddy210 is only asking us for part-(a.).
