4. A rock is thrown from the edge of the top of a 100 m tall building at some unknown angle above the horizontal. The rock strikes the ground at a horizontal distance of 160 m from the base of the building 5.0 s after being thrown. Determine the speed with which the rock was thrown.

Answer: The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

According to the theory of special relativity, time and space are relative to the observer. This means that time can slow down and distances can shorten for an observer traveling at a speed close to the speed of light.

Therefore, if we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it from the perspective of the passengers on the ship. However, for an observer on Earth, the journey would still take 500 years each way.

Similarly, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes, even though the journey would still take 500 years from the perspective of an observer on Earth. This is because time slows down for the passengers on the ship as they approach the speed of light.

While special relativity does tell us that we cannot reach or exceed the speed of light, it also tells us that we can get close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion. This is because the mass of an object increases as it approaches the speed of light, which means that it requires less fuel to accelerate it to a high speed.

In conclusion, the effects of special relativity would allow us to build a spaceship that could travel close to the speed of light and make journeys to distant stars within the lifetimes of the passengers on the ship. However, the journey would still take a long time from the perspective of an observer on Earth.

To learn more about theory of special relativity  here:

https://brainly.com/question/3489672#

#SPJ11

Answer:

164 earth years

Explanation:

By Kepler's third law

r³/T² = constant

(30 A.U)³/T² = (1 A.U.)³/(1 earth year)²

so T = 30^1.5 = 164 earth years

The answer is true, that the hydraulic press utilizes Bernoulli's principle.

It can be derived from the Principle of conservation of energy.

According to Bernoulli's principle, which governs fluid dynamics, a fluid's speed increases concurrently with a reduction in pressure or potential energy. The mathematical concept is named after Swiss mathematician Daniel Bernoulli, who first published it in his book Hydrodynamics in 1738.

The venturi tube is a real-world example of Bernoulli's Principle in action. The venturi tube has an air intake that constricts to a throat and an exit segment that widens as it moves backward. The entrance and outflow both have the same diameter.

To get more information about Bernoulli's Principle :

https://brainly.com/question/13098748

#SPJ1

Answer:

yviygyigiyvyugyivyjvhjvhjbhkbhkbkubhkvykvyivyivukvukgukyirsrssea atrhcvgjvhjbhkvkhvhkbhkbk

Explanation:

hjvhkvkhbhkbjkbjjgkgkughkvhjhvhkvkcytdutxryssyeawqrwerrtyioolllk!mbv xxzaa12335678900_-+()

The x-axis point 2.202 m to the right of the origin is where the electric field caused by the two charges is zero.

A positive line charge with a uniform density is separated by r0 from a positive point charge that has been released from rest. The speed v of the point charge is proportional to A as a function of the instantaneous separation r from the line charge (rr0)

The electric field caused by Q1 at a position along the x-axis is given by:

E1 = kQ1/x^2

Similar to that, the electric field caused by Q2 at a point on the x-axis is given by:

E2 = kQ2/(x - 2)^2

As a result, we must determine the value of x where:

E1 + E2 = 0

The result of substituting the values of E1 and E2 is:

kQ1/x^2 + kQ2/(x - 2)^2 = 0

Simplifying the equation, we get:

Q1/(4πε0x^2) + Q2/(4πε0(x - 2)^2) = 0

where ε0 is the permittivity of free space.

Substituting the given values of Q1 and Q2, we get:

(2.8×10−5)/(4πε0x^2) - (5.4×10−6)/(4πε0(x - 2)^2) = 0

Multiplying both sides by (4πε0x^2(x - 2)^2), we get:

(2.8×10−5)(x - 2)^2 - (5.4×10−6)x^2 = 0

Expanding the equation and simplifying, we get a quadratic equation in x:

2.8×10−5x^2 - 1.12×10−4x + 6.48×10−6 = 0

Solving this quadratic equation using the quadratic formula, we get:

x = 0.064 m or x = 2.202 m

The null point must be to the right of the positive point charge because the positive point charge is fixed at the origin. Hence, the null point is at x = 2.202 m.

To know more about electric field visit:-

https://brainly.com/question/15800304

#SPJ1

Answer:

Explanation:

the answer is b

Answer:

8a = 20.   8b=4

Explanation:

Distance is total amount the object moved. It went from 10, to -2 which is 12 meters away, then to 6 which is 8, adding 8 and 12 is 20 so that is the distance. Displacement is how far it is relative to the starting position, so 10 and 6 are 4 meters away, therefore displacement is 4.

Hope I helped : )

Answer:

…..

Explanation:

give brainiest

The temperature of the gas (in °C) at this pressure is 248.5 °C

Temperature is a bodily quantity that expresses the hotness of count or radiation. There are 3 kinds of temperature scales. Temperature is the degree of hotness or coldness of an item.

Temperature is a degree of the common kinetic energy of the debris in an object. whilst the temperature increases, the motion of those particles also increases. Temperature is measured with a thermometer or calorimeter.

Given;

P₁ = 1.2 x10⁵ Pa = 1.18430792

T₁ = 25.0°C = 298 K

P₂ = 2.1x10 Pa = 0.000207253886

T₂ = ?

using ideal gas equaion:-

PV = nRT

P₁/T₁ = P₂/T₂

T₂ = P₂T₁  /P₁

   = 2.1x10⁵ x  298 / 1.2 x10⁵

   = 521.5 K

   = 248.5 °C

Learn more about temperature here:-https://brainly.com/question/24746268

#SPJ9

Answer:

The angular acceleration of CD player is \(13.93\ rad/s^2\).

Explanation:

Initial angular speed of a CD player is 0 and final angular speed is 41.8 rad/s. Time to change the angular speed is 3 s.

It is required to find the angular acceleration. The change in angular speed of the CD player divided by time taken is called its angular acceleration. It can be given by :

\(a=\dfrac{\omega_f-\omega_i}{t}\\\\a=\dfrac{41.8-0}{3}\\\\a=13.94\ rad/s^2\)

So, the angular acceleration of CD player is \(13.93\ rad/s^2\).

Answer:

Tension of rope T = 35.16 N

Explanation:

Given:

Mass of block = 8 kg

Wood of density = 696 kg/m³

Density of lead = 11,340 kg/m³

Find:

Tension in the string

Computation:

Volume of wood = Mass of block / Wood of density

Volume of wood = 8 / 696

Using Archimedes law

Mw + M  = (Vw + V) 1,000

8/1,000 + 11,340v = (Vw + V) 1,000

V = 3.47 x 10⁻⁴

Tension of rope T

T = v (11,340 - 1,000)9.8 N

T = (3.47 x 10⁻⁴)(11,340 - 1,000)9.8 N

Tension of rope T = 35.16 N

If the upper surface of the wood is just level with the water, the tension in the string is 34.2 Newton.

Mass of block of wood; \(m_w = 8.00kg\)

Density of wood; \(\delta _w = 696 kg/m^3\)

Density of lead; \(\delta _{Ld} = 11340 kg/m^3\)

Density of water; \(\delta _{water} = 1000kg/m^3\)

First we determine the volume of wood:

\(v_w = \frac{mass}{density} = \frac{m_w}{\delta w} = \frac{8.00kg}{696kg/m^3}\\\\v_w = 0.01149m^3\)

Now, using Archimedes principle:

Buoyancy force is determined using the equation:

\(F_b = V * \delta * g\)

Where:

We substitute our values into the equation

\(F_b = 0.01149m^3\ *\ 1000kg/m^3 * 9.8m/s^2\\\\F_b = 112.602 kg.m/s^2\\\\F_b = 112.602N\)

Now, buoyancy force \(F_b\) = Weight + Tension

\(F_b = mg + T\\\\T = F_b - mg\)

We substitute in our values

\(T = 112.602N - ( 8kg * 9.8m/s^2)\\\\T = 112.602N - 78.4kgm/s^2\\\\T = 112.602N - 78.4N\\\\T = 34.2N\)

Therefore, if the upper surface of the wood is just level with the water, the tension in the string is 34.2 Newton.

Learn more:  https://brainly.com/question/12924734

Answer:

The horse will run a distance of 1.5 times the length of the rope around the pole with the rope tightly stretched.

Explanation:

The distance the horse will run around the pole with the rope tightly stretched can be calculated using the formula for the circumference of a circle:

Circumference = 2 × π × radius

Since the horse takes one and a half rounds, we need to multiply the circumference by 1.5 to get the total distance the horse runs around the pole.

Let's assume that the length of the rope is the radius of the circle, and the horse is tied at the center.

Therefore, the distance the horse will run around the pole with the rope tightly stretched is:

Distance = 1.5 × 2 × π × radius

Since the horse is tied with a long rope, we need to use the length of the rope as the radius of the circle.

Let's assume that the length of the rope is 'L'. Then the radius of the circle is equal to L/2π.

Substituting this value in the formula, we get:

Distance = 1.5 × 2 × π × (L/2π)

Simplifying the expression, we get:

Distance = 1.5 × L

Therefore, the horse will run a distance of 1.5 times the length of the rope around the pole with the rope tightly stretched.

Answer:

25%

Explanation:

use F=mg

then use the answer you get from that and plug it into W=Fxh

take that answer and divide it by 400 J and multiply by 100

round to sig figs

Answer:

have a component along the direction of motion that remains perpendicular to the direction of motion

Explanation:

In this exercise you are asked to enter which sentence is correct, let's start by writing Newton's second law.

circular movement

          F = m a

          a = v² / r

          F = m v²/R

where the force is perpendicular to the velocity, all the force is used to change the direction of the velocity

in linear motion

         F = m a

where the force is parallel to the acceleration of the body, the total force is used to change the modulus of the velocity

the correct answer is: have a component along the direction of motion that remains perpendicular to the direction of motion

A) The work done on the book between points A and B is 5.32 J in the direction opposite to the book's motion.

B) The book is moving at 1.91 m/s at point C.

C) If +0.750 J of work was done on the book from point B to point C, the book would be moving at 2.31 m/s at point C.

(a) To find the work done on the book between points A and B, we need to use the work-energy principle, which states that the net work done on an object is equal to its change in kinetic energy:

Net work done = change in kinetic energy

The change in kinetic energy can be found by subtracting the initial kinetic energy at point A from the final kinetic energy at point B:

change in kinetic energy = (1/2)mvB^2 - (1/2)mvA^2

where m is the mass of the book, vA is the velocity of the book at point A, and vB is the velocity of the book at point B.

Substituting the given values, we get:

change in kinetic energy = (1/2)(1.50 kg)(1.25 m/s)^2 - (1/2)(1.50 kg)(3.21 m/s)^2

= -5.32 J

Since the final velocity is less than the initial velocity, the change in kinetic energy is negative. Therefore, the net work done on the book between points A and B is also negative. The magnitude of the net work done is:

|net work done| = |-5.32 J| = 5.32 J

Therefore, the work done on the book between points A and B is 5.32 J in the direction opposite to the book's motion.

(b) Since -0.750 J of work is done on the book from point B to point C, we can use the work-energy principle again to find the final velocity at point C:

Net work done = change in kinetic energy

Substituting the given values, we get:

-0.750 J = (1/2)(1.50 kg)(vC^2 - 1.25^2 m/s^2)

Solving for vC, we get:

vC = 1.91 m/s

Therefore, the book is moving at 1.91 m/s at point C.

(c) If +0.750 J of work was done on the book from point B to point C, we would have:

0.750 J = (1/2)(1.50 kg)(vC^2 - 1.25^2 m/s^2)

Solving for vC, we get:

vC = 2.31 m/s

Therefore, if +0.750 J of work was done on the book from point B to point C, the book would be moving at 2.31 m/s at point C.

The given question is incomplete, the complete question is

A 1.50-kg book is sliding along a rough horizontal surface. at point a it is moving at 3.21 m>s, and at point b it has slowed to 1.25 m>s. (a) how much work was done on the book between a and b? (b) if -0.750 j of work is done on the book from b to c, how fast is it moving at point c? (c) how fast would it be moving at c if +0.750 j of work was done on it from b to c?

To know more about work done here

https://brainly.com/question/28204203

#SPJ4

The average blood pressure in the brain will be higher than the average blood pressure in the feet. the average blood pressure in the brain will be lower than the average blood pressure in the feet.

When the elevator accelerates upward at \(10 ms^{-2}\), the blood pressure in the brain and feet of a person changes.

Similarly, when the elevator accelerates downward with the same acceleration, the blood pressure in the brain and feet of a person changes.

Let's discuss them one by one:Blood Pressure When Elevator Accelerates Upward at \(10 ms^{-2}\)

When the elevator accelerates upward at \(10 ms^{-2}\),  the blood pressure in the brain of a person increases, while the blood pressure in the feet of a person decreases.

This happens due to the gravitational force acting on the body.

Since the gravitational force on the head is greater than the gravitational force on the feet, the blood pressure in the brain increases while the blood pressure in the feet decreases.

Therefore, the average blood pressure in the brain will be higher than the average blood pressure in the feet.

Blood Pressure When Elevator Accelerates Downward at  \(10 ms^{-2}\) When the elevator accelerates downward at \(10 ms^{-2}\), the blood pressure in the brain of a person decreases, while the blood pressure in the feet of a person increases.

This also happens due to the gravitational force acting on the body. Since the gravitational force on the head is less than the gravitational force on the feet, the blood pressure in the brain decreases while the blood pressure in the feet increases.

Therefore, the average blood pressure in the brain will be lower than the average blood pressure in the feet.

For more questions on blood pressure

https://brainly.com/question/23611659

#SPJ8

Answers:

Question 1: 3 sig figs

Question 2: 4 sig figs

Question 3: 5 sig figs

Question 4: 8 sig figs

The rule for sig figs:

Any number after a zero in a decimal is one sig fig.

Example: 0.00359, it has three sig figs.

Also, remember if there are zeros after a number greater than zero, it is also a sig fig as well.

Hope this helps you!

Answer:

1) 3 sf  2) 3 sf  3) 5 sf  4) 6 sf

Explanation:

00s at the start dont count towards the sig figs and 00s at the end dont either but 00s in the middle do

your welcome :)

Answer:

Explanation:

2^5=32-20=-12 meters per sec (going backwards).

If this is correct pls mark me. brainly to let me know, tyy C:

A wind turbine transfers kinetic energy to mechanical energy from energy stores, which is then used to generate electricity.

Wind energy is a type of renewable source of energy that can be used for converting it into electrical energy by the use of turbines that transform mechanical energy into electricity, which is then used for different purposes (both industrial and  particular home usage).

Therefore, with this data, we can see that wind energy can be used to generate electricity by means of turbines that convert mechanical energy into electricity.

Learn more about wind energy here:

https://brainly.com/question/2031508

#SPJ1

Answer:

C. Amplitude

Explanation: Amplitude is the maximum displacement from the equilibrium of a wave. Basically the height.   

According to the question the two charges are -7.5 µC and -7.5 µC.

Charges are fees or payments for services or goods. Charges can be one-time payments, recurring payments, or fees associated with using a product or service. Charges can be for products, services, or activities. Examples of charges include fees for using a credit card, fees for using a bank account, fees for renting a car, fees for using a mobile phone plan, fees for using a subscription service, fees for using a streaming service, and fees for using a gym membership.

Let the two charges be x and ( -15 - x ) µC.

According to Coulomb's law,

F = (k × x × ( -15 - x ))/r2

Where k is the Coulomb's constant,

k = 9 × 109 N × m2/C2

Given, F = 9 × 10-2 N

r = 5 m

Substituting these values in the equation,

9 × 10-2 = (9 × 109 × x × ( -15 - x ))/252

⇒ x2+ 15x - 4.5 × 10-4 = 0

Solving this equation,

x = -7.5 µC and ( -15 - x ) = -7.5 µC

Therefore, the two charges are -7.5 µC and -7.5 µC.

To learn more about charges

https://brainly.com/question/30352947

#SPJ1

Answer:

72 kg

Explanation:

The computation of the mass of the person is shown below:

As we know that

Water displaced weight = Raft weight + person weight

P_w.V = M_r + M_p

where

P_w denotes the water density i.e. 1000 kg/m^3

V denotes the volume of the water in m^3

Now

1000 × 0.224 = 152 + M_p

M_p = 224 - 152

= 72 kg

Short essay is most appropriate for this objective because it allows

students to discuss ways in which related concepts differ in their own

words. True-false, matching, and multiple choice formats do not

typically provide as much opportunity for in-depth discussion.

Answer:

61.8

Explanation:

It must be going at a speed of 61.81 m/s when it reaches the plain below

The kinematic equations are a set of equations that describe the motion of an object with constant acceleration. Kinematics equations require knowledge of derivatives, rate of change, and integrals.

using  Kinematics equations

\(v^{2}\) = \(u^{2}\) + 2gs                         ( a = g)

   = \((53.7)^{2}\) + 2 * 9.8 * 47.8 m

 v  = 61.81 m/s

It must be going at a speed of 61.81 m/s when it reaches the plain below

learn more about Kinematics equations

https://brainly.com/question/12351668?referrer=searchResults

#SPJ2

Here, the slope of the graph is negative and constant.

Hence, acceleration is constant and is in opposite direction to its motion.

So, The object whose motion is represented by this graph is moving with constant acceleration.

Motion is defined in physics as the phenomenon through which an object changes its location with respect to time. Motion is mathematically characterized in terms of displacement, distance, velocity, acceleration, speed, and frame of reference to an observer, with the change in position of the body relative to that frame measured as time passes. Kinematics is the branch of physics that studies forces and their effects on motion, whereas dynamics is the branch that studies forces and their effects on motion.

To learn more about motion the given link:

brainly.com/question/22810476

#SPJ10