78. The initial velocity of a projectile has a horizontal
component equal to 5 m/s and a vertical component
equal to 6 m/s.
At the highest point of the projectile's flight, what is (a) the horizontal component of its
velocity and
(b) the vertical component of its velocity?
Explain.
Answers
Final answer:
The horizontal component of a projectile's velocity remains constant throughout its flight. Hence, at the highest point, its value is the same as the initial, 5 m/s. The vertical component, on the other hand, becomes zero at the highest point.
Explanation:
For a projectile, the horizontal component of motion and the vertical component of motion are independent. Therefore, the horizontal component of velocity remains constant throughout the flight as long as there is no air resistance. Hence, at the highest point of a projectile's flight, the horizontal velocity (a) remains the same, i.e., 5 m/s.
However, for the vertical component, it is subjected to the acceleration due to gravity. At the highest point, the vertical component of velocity (b) becomes zero, because it has momentarily stopped before changing direction and accelerating downwards.
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Answer:Consider again the cannonball launched by a cannon from the top of a very high cliff. Suppose that the cannonball is launched horizontally with no upward angle whatsoever and with an initial speed of 20 m/s. If there were no gravity, the cannonball would continue in motion at 20 m/s in the horizontal direction. Yet in actuality, gravity causes the cannonball to accelerate downwards at a rate of 9.8 m/s/s. This means that the vertical velocity is changing by 9.8 m/s every second. If a vector diagram (showing the velocity of the cannonball at 1-second intervals of time) is used to represent how the x- and y-components of the velocity of the cannonball is changing with time, then x- and y- velocity vectors could be drawn and their magnitudes labeled. The lengths of the vector arrows are representative of the magnitudes of that quantity. Such a diagram is shown below.
Explanation: i hoped that helped!
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Answers
Answer:
The other person who answered is incorrect- the real answer is light.
Explanation:
A mechanical wave is a wave that requires a medium. A medium is any substance that has a defined set of physical properties and can transmit energy. A medium can be a solid, liquid, or gas. Some examples of a medium include an iron bar, the ground, water, lava, air, and helium in a balloon.
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The answer is not waves in the ocean because, obviously, this is a wave. Its medium is the water. Since it has a wave and a medium, it is a mechanical wave.
The answer is not waves in a wheat field because, again, this is a wave. The medium is the air. Since it has a wave and a medium, it is a mechanical wave.
The answer is light. Light travels through electromagnetic waves. However, it does not require a medium. Light can travel not only through air and solid materials, but also through the vacuum of space. Since light does not require a medium, it is not a mechanical wave.
I hope this helps !! :)
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Answers
If this were to happen then the particle would be at the node (the point in the middle where the lines meet). Therefore, the particle will not move up or down because you can see the waves interfere destructively so there is no movement at the node.
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Answer:
The particle will remain stationary due to interference.
Explanation:
Answers
But the direction of the centripetal force is towards the center。
Hope that helps。
operation is
(1) 5.67 × 10^5 J (3) 1.05 × 10^1 J
(2) 9.45 × 10^3 J (4) 1.75 × 10^1 J
Answers
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where P is the power of the device and t is the time.
The power of the television is P=315 W, while the total time is
If we substitute these numbers into the formula, we find the energy:
so, the correct answer is
(1) 5.67 × 10^5 J
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The answer is (1).