An object is dropped from a height of 25 meters. At what velocity will it hit the ground?

Answers

Answer 1

Answer: You can use Vf^2-Vi^2 = 2ax

Vf^2 - 0 = 2(9.81)(25)

Or you can use energy

mgh = 1/2mv^2

2gh =v^2

Same thing

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Scientific Inquiry incorporates many scientific methods.A) trueB) false
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A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answers

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.

Whole of ball's initial kinetic energy is converted into potential energy at maximum height.

Thus we can conclude that the kinetic energy is zero at the maximum height.

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward. At that instant, it has no speed, so its kinetic energy
is zero.

On Planet X, an astronaut has maximum walking speed of 1.9 m/s. The astronaut's legs are each 1.3 m long. What is the constant of acceleration due to gravity on Planet X?A. 8.3 m/s2
B. 2.8 m/s2
C. 3.8 m/s2
D. 1.1 m/s2

Answers

Answer:

Acceleration due to Gravity:

Explanation:

Here g is acceleration due to gravity. So C. 3.8 m/s2

If the breakers at a beach are separated by 5 m and hit shore with a frequency of 0.3 Hz, at what speed are they traveling?

Answers

Wave speed = (frequency) x (wavelength)

= (0.3 Hz) x (5 m)

= 1.5 m-Hz = 1.5 m/s .

If the plotted points on a speed-time graph do not form a straight line, what do you know about the object's acceleration?

Answers

Remember, that while sped is constant, acceleration is not. Acceleration is when velicity changes. So the graph which shows the slop of a velocity vs time describes acceleration.
If we have the straight line on the graph it means that the slope is always the same whereas the non-linear graphs has a variable slope that changes depending on your point in the graph.
To conclude - if your graph is not a straight line it has variable acc at many points.

Final answer:

A speed-time graph where the points do not form a straight line indicates that the object is accelerating in a non-uniform way, meaning its acceleration is changing over time.

Explanation:

If the plotted points on a speed-time graph do not form a straight line, this indicates that the object is accelerating in a non-uniform way. Instead of maintaining a constant rate of acceleration (represented by a straight line), the object's acceleration is changing over time. This could mean that the object is speeding up, slowing down, or changing direction. For example, a curved line might represent a car that starts off slowly, then accelerates rapidly before braking.

Learn more about Acceleration here:

brainly.com/question/11789833

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What kind of relationship between the independent and dependent variable does this graph illustrate? A. inverse proportion
B. linear
C. quadratic
D. direct proportion

Answers

Answer:

C. quadratic

Explanation:

Linear graphs are straight lines, and direct proportion graphs are lines that pass through the origin.

Inverse proportion graphs have vertical and horizontal asymptotes passing through the origin.

Quadratic graphs are parabolas.

The graph shown is a parabola, or quadratic.

Which is NOT a characteristic of a magnetic field produced by a current?a. It can be turned on and off.
b. Its direction can be reversed.
c. Its strength can be changed.
d. Its speed can be slowed.

Answers

The answer is (D.) Its speed can be slowed because the magnetic field can be turned on and off, can have its direction reversed and can have its strength changed. However, The speed of a magnetic field that is produced by a current is impossible to be slowed.

Answer: The correct answer is "Its speed can be slowed".

Explanation:

The current carrying conductor produces the magnetic field. The electric current produces the magnetic field.

The motion of the charge produces the electric field and the magnetic field. If the charge is not moving then it will produce electric field only not magnetic field.

The rate of flow of charges constitutes the current. If the current is not flowing in the conductor then, the magnetic field will not produce. If the amount of current flow increases then the strength of the magnetic field increases.

The magnetic field can be produced by following methods from the given options :

It can be turned on and off.

Its direction can be reversed.

Its strength can be changed.

Therefore, the correct option is (d).

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