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 1

Answer:

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.

Answer 2

Answer: 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.

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A 70 kilogram mountaineer is standing on the summit of Mt. Everest. The distance between the mountaineer and the center of Earth is 6.39 × 106 meters. What is the magnitude of the force of gravity acting on the mountaineer? (The value of G is 6.673 × 10-11 newton meter2/kilogram2. The mass of Earth is 5.98 × 1024 kilograms.)90.50 newtons

111.5 newtons

684.1 newtons

4041.7 newtons

Answers

The force due to gravity between two point masses is given by:
F = GMm/r²; where G is the gravitational constant, M is the larger mass, m is the smaller mass, and r is the distance between the two.
F = (6.673 × 10⁻¹¹ × 5.98 × 10²⁴ × 70) / (6.39 × 10⁶)²
F = 684.1 N

F = GMm/r²

F = (6.673*10^-11)(5.98*10^24)(70)/(6.39*10^...

F = 684 N (3sf)

Atoms form two types of bonds. Which describes these bonds? A.
In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred.

B.
In a covalent bond, valence electrons are transferred; in an ionic bond, valence electrons are shared.

C.
In a covalent bond, outer electron orbitals are shared; in an ionic bond, outer electron orbitals are transferred.

D.
In a covalent bond, outer electron orbitals are transferred; in an ionic bond, outer electron orbitals are shared.

Answers

Atoms form two types of bonds: ionic bond and covalent bond. In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred. The answer is letter A.

Answer:

Atoms form two types of bonds: ionic bond and covalent bond. In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred.

Explanation:

Therefore, the answer is A

You're in an airplane that flies horizontally with speed 1100 km/h (300 m/s ) when an engine falls off. Neglecting air resistance, assume it takes 26 s for the engine to hit the ground.Find the height of airplane.

Answers

Answer:

The height of the airplane is 3312.4 meters.

Explanation:

Given that,

Speed of the airplane, v = 1100 km/h = 300 m/s

It takes 26 s for the engine to hit the ground. We need to find the height of the airplane. Using second equation of motion to find it as :

$h=ut+(1)/(2)at^2$

Here, u = 0 and a = g

$h=(1)/(2)gt^2\n\nh=(1)/(2)* 9.8* (26)^2\n\nh=3312.4\ m$

The height of the airplane is 3312.4 meters.

Which of the following is not one of the observed characteristics of our solar system?all planets go in the same circular direction
all planets look as though they lie along a flattened circular plane or disk
the Sun and planets rotate in the same direction
all moons orbit planets in a counterclockwise direction

Answers

Our solar system is made up of an ordinary star known as the Sun. All moons orbit planets in a counterclockwise direction are not one of the observed characteristics of our solarsystem.

What is the solar system?

Our solar system is made up of an ordinary star known as the sun, as well as the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

It contains the planets' satellites, as well as countless comets, asteroids, and meteoroids, as well as the interplanetarymedium.

When viewed from the Northpole or the North star Polaris, the Moon and all other typical non-asteroid size moons in our solar system orbit their host planet in a counter-clockwise manner.

To learn more about the solar system refer to the link;

brainly.com/question/12075871

The answer is: all moons orbit planets in a counterclockwise direction

A metal pot feels hot to the touch, but the plastic handle does not. Which type of material is the plastic handle? A. A thermal insulator, because it transfers heat easily B. A thermal conductor, because it does not transfer heat easily C. A thermal conductor, because it transfers heat easily D. A thermal insulator, because it does not transfer heat easily

Answers

Answer:

Option (D)

Explanation:

There are two types of materials.

1. Conductors: The materials which can allow the heat to pass through it are called conductors. For example, iron, copper, etc.

2. Insulators: The materials which do not heat to pass through it are called insulators. For example, plastic, wood, rubber, etc.

Here plastic handle does not feel hot because it is an insulator and it does not allow to pass the heat through it.

D is the answer..........

Bjorn is holding a tennis ball outside a second floor window (3.5 meters from the ground) and billie jean is holding one outside a third floor window (6.25 meters from the ground) how much more GPE does billie jean's tennis ball have? (each tennis ball has a mass of 0.06 kg)

Answers

The answer is 1.01 x 10^(-11) N. I arrived to this answer through calculating the GPEs of both balls. Bjorn's ball has a GPE of 1.402 x 10^(-11) N. Billie Jean's ball has a GPE of 2.503 x 10^(-11) N. I subtracted the two and I found that Billie Jean's tennis ball has a GPE of 1.01 x 10^(-11) more than Bjorn's tennis ball.

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