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lions [1.4K]
3 years ago
5

A ball is dropped from the roof of a building. Points A, B, C, and D in the diagram below represent positions of the ball as it

falls. At which position will the ball have the greatest kinetic energy?

Physics
1 answer:
Anvisha [2.4K]3 years ago
4 0

Answer:

C. C

Explanation:

The ball will have its greatest kinetic energy just before it touches the ground which is at point C.

Kinetic energy of a body is the energy due to the motion of the body. As a body moves and its speed increases as a result of acceleration, then the kinetic energy will increase more.

As the body starts from rest, at point A, through B and C, the velocity increases drastically due the pull of the earth.

So, point C will show the greatest velocity and hence the most kinetic energy by the body.

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What is the easiest way to increase the magnetic force acting on the rotor in an induction motor?
Schach [20]

Answer:

Explanation:

Magnets are of two major forms namely the permanent magnet and the temporary magnets. Temporary magnets magnetizes and demagnetize easily while permanent magnets does not magnetizes and demagnetize easily.

This permanents magnets are applicable in loudspeakers, generators, induction motor etc.

To increase the

The following will tend to increase the magnetic force acting on the rotor in an induction motor.

1. Increasing the strength of the bar magnet. Increase in strength of the magnet will lead to increase in the magnetic force acting on the rotor.

2. Increase in the magnetic line of force also known as the magnetic flux around the magnet will also increase the magnetic force acting on the rotor.

6 0
3 years ago
A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 0.900 fg (where a femtogra
just olya [345]

Answer:

9.73 x 10⁻¹⁰ m

Explanation:

According to Heisenberg uncertainty principle

Uncertainty in position x uncertainty in momentum ≥ h / 4π

Δ X x Δp ≥ h / 4π

Δp = mΔV

ΔV = Uncertainty in velocity

= 2 x 10⁻⁶ x 3 / 100

= 6 x 10⁻⁸

mass m = 0.9 x 10⁻¹⁵ x 10⁻³ kg

m = 9 x 10⁻¹⁹

Δp = mΔV

= 9 x 10⁻¹⁹ x 6 x 10⁻⁸

= 54 x 10⁻²⁷

Δ X x Δp ≥ h / 4π

Δ X x  54 x 10⁻²⁷ ≥ h / 4π

Δ X = h / 4π x 1 /  54 x 10⁻²⁷

= \frac{6.6\times10^{-34}}{4\times3.14\times54\times10^{-27}}

= 9.73 x 10⁻¹⁰ m

7 0
3 years ago
Is the image formed by a plane mirror always real?<br><br>True or false?​
mafiozo [28]
This statement is false
6 0
2 years ago
Which of the following are ways to improve muscle endurance:
Lyrx [107]
How to gain muscular endurance?<span>Combine strength days with cardio days.Reduce your amount of rest between sets.Do fast-paced, high-intensity lifting.Choose compound movements over isolation.10 Ways to Protect Your Joints >>> Remember: Routine is the enemy.Go for hybrid exercises.<span>Add explosive movements to your workout.</span></span>
4 0
3 years ago
Find the total displacement of a mouse that travels 1.0 m north and then 0.8 m south.
andreev551 [17]
North: 1m
South: 0,8m

Direction:

1m>0,8m 

so mouse moved north

Distance:

1m-0,8m=0,2m

so mouse traveled 0,2m


Answer: The mouse moved 0,2m north.



"Non nobis Domine, non nobis, sed Nomini tuo da gloriam."



Regards M.Y.





3 0
3 years ago
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