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3 years ago

An element has a charge of -3, has 8 protons, 11 neutrons, and electrons

1 answer:

6 0

Question isn’t clear
If it’s asking the no of electrons then -
No of electrons =no of protons in an atom of a element ....therefore there are 11 electrons

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A car has an acceleration of -5 m/s^2. Describe the car’s motion

AlladinOne [14]

Explanation:

because the acceleration is negative, this indicates a deceleration (or slowing down) . Hence we can say that:

The car is decelerating (slowing down), i.e its velocity is decreasing, at a constant rate of 5m/s².

7 0

4 years ago

You're collecting data in BeyondLabz for an object in free fall, subject to air resistance. How do you know when you've collecte

denis23 [38]

Enough data points would have been collected when specific data for upward and downward motion are collected.

<h3>What is a Data point?</h3>

A data point is a discrete unit of information. This information is always unique.

An object subjected to free fall is under the influence of gravity. An object subjected has different time of motion for upward and downward motion.

Thus, we can conclude that enough data points would have been collected when specific data for upward and downward motion are collected.

Learn more about free fall here: brainly.com/question/10909077

6 0

3 years ago

A buoy is anchored tho the oceanfloor. A large wave approaches the buoy. How will the buoy move as the wave goes by?

nadezda [96]

Answer:

The buoy will move upwards and downwards and well as left and right

Explanation:

As the wind is storing so had the capability to move the buoy in all directions as it is a light object despite being anchored down

PLEASE GIVE BRAINLIEST AND THANKS :-)

5 0

3 years ago

A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.

AleksandrR [38]

(B) The balloon will rise because the upward buoyant force is greater than its weight.

Explanation:

In order to evaluate what happens to the balloon, we need to compare the magnitude of the two forces acting on the balloon:

- Its weight, W, acting downward

- The buoyant force, B, acting upward

The weight of the balloon is given by:

$W=mg$

where

m = 2.0 kg is the mass of the balloon

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$W=(2.0)(9.8)=19.6 N$

The buoyant force on the balloon is given by:

$B=\rho V g$

where

$\rho = 1.3 kg/m^3$ is the air density

$V=5.0 m^3$ is the balloon's volume

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$B=(1.3)(5.0)(9.8)=63.7 N$

We observe that the buoyant force B is larger than the weight, so the balloon will accelerate upward, and the correct answer is

(B) The balloon will rise because the upward buoyant force is greater than its weight.

#LearnwithBrainly

3 0

3 years ago

An 18g bullet is shot vertically into a 10kg block. The block lifts upward 9mm. The bullet penetrates the block in a time interv

stealth61 [152]

Answer:

The initial kinetic energy of the bullet is closest to 491.87 J

Explanation:

Given;

mass of bullet, m₁ = 18g = 0.018kg

mass of block, m₂ = 10kg

height moved by the block, h = 9 mm = 0.009 m

time taken for the bullet to travel through the block, t = 0.001s

let the initial velocity of the bullet = v₁

let the final velocity of the bullet = v₂

Apply the principle of conservation of linear momentum;

initial momentum = final momentum

0.018v₁ = v₂(0.018 + 10)

0.018v₁ = 10.018v₂ -----equation (1)

Apply the law of conservation of energy when the bullet lifts the block through 9mm

mgh = ¹/₂mv₂²

gh = ¹/₂v₂²

v₂² = 2gh

v₂ = √2gh

v₂ = √(2 x 9.8 x 0.009)

v₂ = 0.42 m/s

Substitute in v₂ in equation 1, to determine the initial velocity of the bullet;

0.018v₁ = 10.018v₂

0.018v₁ = 10.018(0.42)

0.018v₁ = 4.208

v₁ = 4.208 / 0.018

v₁ = 233.78 m/s

Now, determine the initial kinetic energy of the bullet;

K.E₁ = ¹/₂m₁v₁²

K.E₁ = ¹/₂(0.018)(233.78)²

K.E₁ = 491.87 J

Therefore, the initial kinetic energy of the bullet is closest to 491.87 J

6 0

4 years ago