When a 10-kg block is simultaneously pushed toward the east with 20N and toward the west with 15N, the combination of these forces on the block is 5N toward the East
Let's understand this problem in detail
Let which is in east direction
and which is acting in the west direction
Now,
But and are in opposite direction.
So let's rotate the force vector by 180 degrees which becomes
Now both and are in same directionof the forces are in a single line
Adding both of them, we get
=
= 20N - 15N = 5N, as both of the forces are in east direction hence, the net force is also acting in the east driection
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Answer:
The mechanical energy of the coin has been used up in doing work against friction.
Explanation:
When two bodies in contact move against one another, friction comes to play. Friction converts energy in such a system to heat which raises the temperature of the body, with most lost to the ambient environment. Sliding the coins on the floor transfers energy from your hand into the mechanical energy of the coin as it moves across the floor. Fiction between the coin and the surface of the floor gradually slows the coin down by converting its energy to heat (which raises the temperature of the coin as detected by the thermometer) until the coin comes to a halt.
Answer:
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy. Mechanical waves transport energy. Slightly faster than Rayleigh waves, at about 90% of the body wave velocity, and have the largest amplitude.
Explanation:
Answer:
As from the given text, the answers are:
a) Genetic variation is the reason why we all humans look different.
b) Evolution relies on the genetic variations as individuals of species with favorable characteristics are more likely to reproduce.
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Explanation:
When an object moves up in the air, kinetic energy (KE) is converted into potential energy (PE). When kinetic energy is exhausted, the object will stop rising and begin to descend. But the KE lost is all converted to PE.
1. Both kinetic energy when the gymnast leaves the trampoline and the potential energy achieved at the highest point are the same and equal to
PE(at highest point) = KE (when leaving trampoline)
= (mv^2)/2 = 60 kg * (7 m/s)^2 /2 = 1470 joules
2. Since the PE at the highest point is 1470 and equals mgh, we have
60*9.81*h = 1470 joules
Solve for h
h= 1470/(60*9.81) = 2.50 m