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4 years ago

What force causes the periodic motion of a pendulum?

2 answers:

7 0

the answer of this question is option A because,

Pendulum. If you swing a weight on a string, it will go back and forth in regularperiodic motion. ... The force of gravitycauses the pendulum bob to change directions, while the force from the string moves it in a semi-circular motion

borishaifa [10]4 years ago

5 0

Answer:

the Answer is A

Explanation:

because the swinging motion of a pendulum is due to the force of gravity generated by the earth's size

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Which situation describes a system with decreasing gravitational potential energy?

umka2103 [35]

An example of a system with decreasing gravitational potential energy is a ball in free fall.

At its initial height h, the ball has a gravitational potential energy equal to
$U=mgh$
where m is the ball mass and g is the gravitational acceleration. As the ball falls toward the ground, its height h decreases, and so its gravitational potential energy decreases as well, according to the formula
$U=mgh'$
where h' is the new height of the ball.

8 0

3 years ago

Which of the following could occur the net force acting on a truck is zero

Whitepunk [10]

Answer:

No net force means the truck reamains at rest or the motion of the truck does not change.

Explanation:

5 0

2 years ago

gaseous h2 and br2 are added to an evacuated 1.15L container kept at 298K. The intial partial pressurre of H2(g) is 0.782 atm an

Nastasia [14]

The partial pressures of HBr when the system reaches equilibrium is 2.4 X 10⁻¹¹ atm

<u>Explanation:</u>

H₂ + Br₂ ⇒ 2HBr

PH₂ = 0.782atm

PBr₂ = 0.493atm

Kp = (PHBr)²/ (PH₂) (PBr₂) = 1.4 X 10⁻²¹

At equilibrium:

Let 2x = pressure of HBr

PH₂ = 0.782 -x

PBr₂ = 0.493 - x

Kp = (2x)^2 / (0.782-x)(0.493-x)

Now, because Kp is very small, x will be very small compared to 0.782 and 0.493.

Then,

Kp = 1.4X10⁻²¹ = (4x²) / (0.782)(0.493)

x = 1.2X10⁻¹¹

PHBr = 2x = 2.4 X 10⁻¹¹ atm

Therefore, the partial pressures of HBr when the system reaches equilibrium is 2.4 X 10⁻¹¹ atm

3 0

3 years ago

An aeroplane flies at a constant speed of 250 m/s

Allushta [10]

Answer:

250+50=300ms-¹

I would appreciate if my answer is chosen as a brainliest answer

8 0

3 years ago

Which of the following is a scalar quantity?

aalyn [17]

A. 14 gallons.

Scalar quantities require magnitude to describe them. They do not need direction to be described. 14 gallons is the mass of the gallons which is a scalar quantity.

5 0

3 years ago