you are waiting in line to use the diving board at your local pool. While watching people dive into the pool from the board, you realize that using a diving board to spring into air before a dive is a good example of newtons third law of motion. Explain how a diving board illustrates newton's third law of motion?
Answers
Answer:
While we jump on the diving board then the force is applied by us in the downward direction on the diving board
due to this action force applied by us the diving board goes downwards while due to the reaction force of that diving board we will experience a force in opposite direction
that reaction force will be equal in the magnitude of the force applied by us on the diving board and it is opposite in the direction
so here we will move upwards and lift off the diving board
so this is a great example of newton's III law as per this law every action has equal and opposite reaction force
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Which one of the following SI base units is not matched to the correct unit of measurement? A. Mass: kg B. Time: s C. Length: km D. Temperature: K
Answers
Answer:
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
Explanation:
Potential and Kinetic Energy
The gravitational potential energy is the energy an object has due to its height above the ground. The formula is
Where:
m = mass of the object
g = acceleration of gravity (9.8~m/s^2)
h = height
Note we can also use the object's weight W=mg into the formula:
The kinetic energy is the energy an object has due to its speed:
Where v is the object's speed.
Initially, the object has no kinetic energy because it's assumed at rest.
The W=30 N rock falls from a height of h=40 m, thus:
Since the sum of the kinetic and potential energies is constant:
U' + K' = 1,200 J
Here, U' and K' are the energies at any point of the motion. Since both must be the same:
U' = K' = 600 J
U'=Wh'=600
Solving for h':
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
Answers
Answer:
- 70 kg
Explanation:
We know that,
- Kinetic energy = 1/2 mv²
Where m is mass and v is velocity or speed.
Putting the required values,
- 5040 = 1/2 × m ( 12 × 12)
- 5040 × 2 = m × 144
- 10080 = m × 144
divide both side by 144
- m = 70 kg
So the mass of the diver is 70 kg respectively.
A.
They reflect visible light but let infrared light pass through.
B.
They reflect both visible light and infrared light.
C.
They reflect infrared light but let visible light pass through.
D.
They let both infrared light and visible light pass through.
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Because they do not affect visible it only affects infrared light
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Wait but u don't mention speed, so there's no momentum
Answers
Answer:
you should sell your skateboards at $240
Explanation:
The price p to sell your skateboards for so that there is neither a shortage nor a surplus is the price that makes equal the quantity of sales and the quantity of supply, so p is equal to:
q (sales) = q (supply)
-3p + 700 = 2p - 500
700 + 500 = 2p + 3p
1200 = 5p
1200/5 = p
$240 = p