An object is thrown up into the air going 9m/s. How fast is it going 2 seconds later?

Answers

Answer 1

Answer:

As per the question, the object is thrown in vertically upward direction.

The initial velocity of the ball [u] = 9 m/s.

We are asked to calculate the velocity of the ball after 2 second.

When the ball goes up, the only force that acts on the ball is the force of gravity.

Hence the acceleration of the ball is nothing else than acceleration due to gravity i.e g and it is downward in direction.

Here, it will be considered negative as it is downward in direction .

From equation of kinematics we know that-

v = u +at [Here v is the final velocity and a is the acceleration.

= 9 +[-9.8]×2 m/s $[g =9.8m/s^2]$

= 9-19.6

= -10.6 m/s

Here the negative sign indicates that the ball is falling downward. It is coming back after reaching its maximum height.

Here the total time of flight of the ball is-

$T= 2*(u)/(g)$

$= 2*(9)/(9.8) seconds$

$= 1.8367\ seconds$

If the ball is thrown from certain height from the ground, then the velocity of the ball will be the calculated value.

If the ball is thrown from the ground, obviously the ball will heat the ground after 1.8367 seconds later.So the velocity of the ball will be zero after 2 seconds.

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James Cameron piloted a submersible craft to the bottom of the Challenger Deep, the deepest point on the ocean's floor, 11,000 m below the surface. What was the total inward force on the 1.1-m-diameter pilot sphere in which Cameron sat?

Answers

Answer:

$4.1\cdot 10^8 N$

Explanation:

First of all, we need to find the pressure exerted on the sphere, which is given by:

$p=p_0 + \rho g h$

where

$p_0 =1.01\cdot 10^5 Pa$ is the atmospheric pressure

$\rho = 1000 kg/m^3$ is the water density

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

$h=11,000 m$ is the depth

Substituting,

$p=1.01\cdot 10^5 Pa + (1000 kg/m^3)(9.8 m/s^2)(11,000 m)=1.08\cdot 10^8 Pa$

The radius of the sphere is r = d/2= 1.1 m/2= 0.55 m

So the total area of the sphere is

$A=4 \pi r^2 = 4 \pi (0.55 m)^2=3.8 m^2$

And so, the inward force exerted on it is

$F=pA=(1.08\cdot 10^8 Pa)(3.8 m^2)=4.1\cdot 10^8 N$

The total inward force is about 4.1 × 10⁸ N

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Further explanation

Let's recall Hydrostatic Pressure formula as follows:

$\boxed{ P = \rho g h}$

where:

P = hydrosatic pressure ( Pa )

ρ = density of fluid ( kg/m³ )

g = gravitational acceleration ( m/s² )

h = height of a column of liquid ( m )

Let us now tackle the problem!

$\texttt{ }$

Given:

depth of the ocean's floor = h = 11 000 m

diameter pilot sphere = d = 1.1 m

atmospheric pressure = Po = 10⁵ Pa

Asked:

total inward force = F = ?

Solution:

$F = P A$

$F = ( P_o + \rho g h ) A$

$F = ( P_o + \rho g h ) ( \pi d^2 )$ → Area of Sphere = π d²

$F = ( 10^5 + 1000 * 9.8 * 11000 ) ( \pi * 1.1^2 )$

$F \approx 4.1 * 10^8 \texttt{ Newton}$

$\texttt{ }$

Conclusion:

The total inward force is about 4.1 × 10⁸ N

$\texttt{ }$

Learn more

Buoyant Force : brainly.com/question/13922022

Kinetic Energy : brainly.com/question/692781

Volume of Gas : brainly.com/question/12893622

Impulse : brainly.com/question/12855855
Gravity : brainly.com/question/1724648

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Answer details

Grade: High School

Subject: Physics

Chapter: Pressure

How can motion be described?

Answers

In physics, motion is a change in position of an object with respect to time. Motion is typically described in terms of displacement, distance, velocity, acceleration, time and speed.

Final answer:

Motion can be described in terms of direction, speed, and change. Direction is the course in which the object is moving, speed is the rapidity of the object's movement, and change in motion happens when the speed or direction changes over time.

Explanation:

Motion can be described through three main elements: direction, speed, and change. The direction is the course in which the object is moving, for example, north, south, east, or west in linear motion. The speed is the swift of the object's motion, often calculated in terms such as meters per second, miles per hour etc. Changes in motion, also referred to as acceleration or deceleration, occur when the speed or direction of an object change over a period of time. For an instance, if a car moves from rest and accelerates to 60 miles/hour in 10 seconds, it describes a change in motion.