Ice melts due to the chemical properties of water. There are more hydrogen bonds between the molecules of ice than in water.
Water boils when the thermal energy in the water, which is a type of kinetic energy which causes the water molecules to move around, exceeds the strength of the hydrogen bonds between the other molecules.
Given :
An ant is crawling along a yardstick that is pointed with the 0-inch mark to the east and the 36-inch mark to the west.
It starts at the 14-inch mark, crawls to the 20-inch mark, then moves to the 16-inch mark.
To Find :
The total distance the ant traveled.
Solution :
Total distance travelled by ant = (distance between 14 and 20 inch mark) +
(distance between 20 and 16 inch mark)
Total distance = (20-14 ) + ( 20-16) = 6 + 4 = 10 inch.
Therefore, total distance the ant traveled is 10 inch.
Hence, this is the required solution.
Answer: 567 N
Explanation:
If the weight of the person and the bike are supported equally by the two tires, this means that the force acting on each tire, is half of the total weight.
We know that the gauge pressure in one tire, by definition, is equal to the force on the tire, over the contact surface between each tire and the road, so we can write:
P= F/A = (mrider g + mbike g) / A = (Fgrider + 7.5 kg. 9.8 m/s2) / 703 mm2 (1)
As the pressure data is given in lb/in2, it is needed to convert to N/mm2, as follows:
65.5 lb/in2 = 0.455 N/mm2.
Replacing in (1), and solving for Fgrider, we have:
Fgrider = 567 N
Answer:
We understand that two like poles of magnet repel each other. Maglev train is based on the same concept. The train levitates above the tracks because of repulsion between one set of magnets. One set of magnets lifts the train upwards causing it to levitate or float above tracks and other set of magnets causes it to move forward. This method enables less consumption of energy as loss of energy due to friction is negligible and also, high speed can be achieved.
Answer:
8 mph, 12 mph
Explanation:
t = Time taken = 7 hours
x = Speed of Randall
x+4 = Speed of Gregory
The distance they both will travel together is 140 miles if they start at the same time.
The speed of Randall is 8 mph
The speed of Gregory is 8+4 = 12 mph
