When Galileo Galilei was alive, most scientists believed that heavy objects fall to Earth faster than light objects. Galileo conducted an experiment and found that objects of the same size and shape fall to Earth at the same speed, no matter their mass. What did Galileo most likely have to do in order to convince other scientists that his observations were correct?
A.
Keep the results to himself and wait for other scientists to conduct similar experiments.
B.
Conduct an experiment in which he tries to force one object to fall faster than a lighter object.
C.
Repeat the experiment multiple times in front of witnesses.
D.
Publish the results of the experiment.

Answer:

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Answer: Aspirin is recommended as initial treatment to prevent recurrent ischemic stroke. Clopidogrel is recommended as an alternative monotherapy and in patients allergic to aspirin. The combination of clopidogrel and aspirin is not recommended for long-term use (more than two to three years) because of increased bleeding risk. Aspirin has been shown to lower the risk of heart attack and stroke in patients who have cardiovascular disease.

Explanation:

The pressure of the carbon dioxide is  21.2 kPa.

We know that the pressure of the gas is the force with which the gas does hit the walls of the container. In this case, we are told that a cylindrical gas tank 1 m long, inside diameter of 20 cm, is evacuated and then filled with carbon dioxide gas at 25°C.

Thus;

Volume of the cylinder = πd^2/4

Volume = 3.142 * (20 * 10^-2)^2/4

= 0.03142 m^3

From the ideal gas law;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

Then;

n = 1.2 * 10^3 g/44 g/mol = 27.3 moles

P = nRT/V

P = 27.3 * 0.082 * 298/0.03142

P = 21.2 kPa

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There is no acceleration that is imparted to the car, then the forces are balanced.

We know that unbalanced force is that which cause a body to move or to cause a body to stop moving at a constant rate. If that is so, then a body that acted upon by a system of balanced forces would remain at rest or would continue in a state of uniform motion.

Given the fact that we have been told that this car is moving at a constant speed of about +12 m/s, it is now plain that what acts on the car must be forces that are balanced since the  car is not accelerating.

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Answer:

the answer is 0

Explanation:

Answer: when i took the blanket from my sibling at night

Explanation:

The Force of friction on the bicycle of mass 91.4 kg, while moving is 546 N.

Force is the product of mass and acceleration.

To calculate the force of friction while the bicycle moves, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the force of friction on the bicycle is 546 N.

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The loss in the gravitataional potential energy is obtained as  7.056 * 10^9 J and this energy is converted to  the kinetic energy of the moving aircraft.

The term gravitational potential energy has to do with the energy that is possessed by a body by virtue of its position. Thus it has to do with the height of the object. The greater the height, the more the gravitational potential energy.

Now;

E = mgh

m = mass of the object

g = acceleration due to gravity

h = height of the object

Thus;

The loss in the gravitational potential energy is obtained from;

80,000 * 9.8 (10,000 - 1000)

= 7.056 * 10^9 J

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Answer:

Approximately [tex]0.293\; {\rm kg \cdot m^{2}}[/tex].

Explanation:

Since the wheel started from rest, initial angular velocity will be [tex]\omega_{0} = 0\; {\rm rad \cdot s^{-1}}[/tex]. It is given that the angular velocity [tex]\omega_{1}[/tex] is [tex]14.9\; {\rm rev \cdot s^{-1}}[/tex] after [tex]t = 3.41\; {\rm s}[/tex]. Apply unit conversion and ensure that all angular velocity are measured in radians-per-second:

[tex]\begin{aligned} \omega_{1} &= 14.9\; {\rm rev \cdot s^{-1}} \times \frac{2\, \pi \; {\rm rad}}{1\; {\rm rev}} \\ &\approx 93.620\; {\rm rad \cdot s^{-1}}\end{aligned}[/tex].

Change in angular velocity:

[tex]\begin{aligned} \Delta \omega = \omega_{1} - \omega_{0} \approx 93.620\; {\rm rad \cdot s^{-1}}\end{aligned}[/tex].

Since the tangential force is constant and there is no friction on the wheel, the angular acceleration [tex]\alpha[/tex] of this wheel will be constant. Since the change in velocity [tex]\Delta \omega \approx 93.620\; {\rm rad \cdot s^{-1}}[/tex] was achieved within [tex]t = 3.41\; {\rm s}[/tex], the average angular acceleration will be:

[tex]\begin{aligned} \alpha &= \frac{\Delta \omega}{t} \\ &\approx \frac{93.620\; {\rm rad \cdot s^{-1}}}{3.41\; {\rm s}} \\ &\approx 27.45\; {\rm rad \cdot s^{-2}}\end{aligned}[/tex].

At a distance of [tex]r = 0.110\; {\rm m}[/tex] from the axis of rotation, the tangential force [tex]F = 73.0\; {\rm N}[/tex] will exert on the wheel a torque [tex]\tau[/tex] of magnitude:

[tex]\begin{aligned} \tau &= F\, r \\ &= (73.0\; {\rm N})\, (0.110\; {\rm m}) \\ &\approx 8.030\; {\rm N \cdot m}\end{aligned}[/tex].

Let [tex]I[/tex] denote the moment of inertia of this wheel. The equation [tex]\alpha = (\tau / I)[/tex] relates angular acceleration [tex]\alpha[/tex] to moment of inertia [tex]I\![/tex] and net torque [tex]\tau[/tex]. Rearrange this equation to find the moment of inertia:

[tex]\begin{aligned}I &= \frac{\tau}{\alpha} \\ &\approx \frac{8.030\; {\rm N\cdot m}}{27.45\; {\rm rad \cdot s^{-2}}} \\ &\approx 0.293\; {\rm N \cdot m \cdot s^{2}} \\ &= 0.293 \; {\rm kg \cdot m^{2}}\end{aligned}[/tex].

Note that the unit "radians" is typically ignored. Additionally, [tex]1\; {\rm N} = 1\; {\rm kg \cdot m \cdot s^{-2}}[/tex].

Hence, the moment of inertia of this wheel is approximately [tex]0.293\; {\rm kg \cdot m^{2}}[/tex].

Answer: 92

Explanation:

equation : x+7=99

here, we need to get x alone so we subtract 7 from both sides

x +7-7 = 99 -7 on the left side of the equation the 7s cancel out

x=92

The amount of work done by the 100 W motor in 5 minutes is 30000 J.

Work is said to be done when a force moves a body through a certain distance.

To calculate the amount of work done by the motor, we use  the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the amount of work done by the motor is 30000 J.

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The water cycle moves from one pond to another i.e. from the river to the ocean, or from the ocean to the atmosphere.

The water cycle is the path that all water accompanies as it moves around Earth in other states. The warm dry air at this distance then increases evaporation, which leaves the land beneath even drier. There are three basic locations of water storage that occur in the erratic water cycle. Water is stored in the atmosphere; water is deposited on the surface of the earth, and water is stored in the ground. There is no start or end to the water cycle, but for classification purposes, we will start at the sun.

So we can conclude that the water cycle relates to water being exchanged through Earth's land, ocean, and atmosphere.

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The appropriate object category are:

Red giant or super giant → very cool but very luminous→ found in the upper right of the H-R diagram, then

Main sequence stars →The majority of stars in our galaxy→ Sun →for example a very hot and very luminous star, then

White dwarfs → very hot but very d→ not much larger in radius than earth.

Giant:

When  stars run out of their fuel that is hydrogen for the nuclear fusion reactions then they would convert into the Giant stars. main sequence stars.

Main Sequence:

Stars are called main sequence stars when their core temperature reaches up to 10 million kelvin and their start the nuclear fusion reactions of hydrogen into helium in the core of the star.

White dwarfs:

When the stars run out of their fuel then they actually shed the outer layer planetary nebula, the remaining core part that remain behind is called as white dwarf.

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Statement 1 is not correct.

The rate at which velocity changes over time, both in terms of speed and direction, is defined as acceleration. A point or object traveling in a straight path is accelerated if it accelerates or decelerates. Even if the speed is constant, the motion of a circle is accelerated because the direction is constantly changing.

Given that

Acceleration is always a positive number.

Acceleration has SI units of m/s².

The slope on a speed-time graph is the object's acceleration.

To calculate the acceleration of an object, the change in velocity is divided by the length of the time interval over which the change occurs.

When a body accelerates, it is positive; when it slows, it is negative. Positive acceleration is directed along the velocity axis. Negative acceleration, on the other hand, is oriented in the opposite direction as the velocity.

The SI unit of acceleration is m/s2. Because acceleration is defined as velocity in meters per second divided by time in seconds, the SI units for acceleration are m/s2, meters per second squared, or meters per second per second, which essentially means how many meters per second the velocity changes every second.

The acceleration of an item is represented by the slope of a speed-time graph. The slope of a speed-time graph displays the rate of change of the body's speed and is known as acceleration.

To compute an object's acceleration, divide the change in velocity by the length of the time interval over which the change occurs. When you accelerate quickly, you apply a lot of force on an object. Depending on the speed and direction, acceleration can be either positive or negative.

A = velocity change/time

A = (vf- v1)/time

Therefore statement 1 is not correct

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Answer: yes

Explanation:

The main consequence of forming jovian planets starting with extra mass from hydrogen compounds is that the jovian planets was cold enough for hydrogen compounds to condense into ices. This cause them to grow to large size.

Jovian planets formed in the outer solar system, farther from the sun where ices and rocks were plentiful. The cores accreted rapidly into large clumps of ice and rocks. Jovian planets was cold enough for hydrogen compounds to condense into. Eventually, they become so large, they captured a large amount of hydrogen and other gases from the surrounding nebula with their enormous gravity. The atmosphere of the Jovian planets in our solar system are made mostly of hydrogen and helium compounds and containing hydrogen are--water, ammonia, and methane.

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The following which is not a way that machines provide a mechanical advantage is that it changes power and is denoted as option C.

This is referred to the measure of how much a force is increased by using a tool or machine and is calculated by finding the ratio of the output force to input force.

Changing the power is not a way in which machines provide a mechanical advantage as a result of the parameter not directly involved in how it functions which is therefore the reason why it was chosen as the correct choice.

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13.50 g/cm³ value when converted into SI unit is  13500 kg/m³.

SI stands for system international that is standardized to be used for research , various purposes.

1 gram /cm³=1000 kg/m³

so therefore 13.50g/cm³= 13.50 x 10³kg/m³

The reason behind using kg as SI unit of mass is because its defined by taking fixed numerical value of plank's constant.

SI unit of length is metre as it's defined by taking fixed numerical value of speed of light in vacuum. so unit of volume is m³.

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In a reference frame fixed to Earth, a point on the equator moves zero distance in 1 hour.

A frame of reference in physics is made up of an abstract coordinate system and the collection of physical reference points that fix the coordinate system specifically and regulate measurements inside it.

When we take a reference frame fixed to Earth,  the displacement due to earth's rotation can not be measured. So, any point on earth remains in rest through out the day with respect to the reference frame fixed to Earth. Hence, a point on the equator moves no distance in 1 hour in a reference frame fixed to Earth.

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The answers include the following:

This is an institution which provides supervision and care of infants and young children especially so that parents can focus on their jobs.

The director is the head of the daycare and issues such as this should be reported to him/her so as to enable the best possible resolution.

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Answer:

mass and size are the main important to any playing person for more the two extremely don't Matcha the person doesn't play any exercise

Answer: 2m

Explanation:

x = v(t)

x = (1 m/s)(2s)

x = 2m

Answer:

4.44 N

Explanation:

10 = G m1 m2 / r^2      G    m1   and m2 are constant   so:

10 = k /r^2

10 = k / (.30^2 )

.9 = k              now increase to  .45

F = .9 / (.45^2)    =   4.44 N      

1900 J of heat or thermal energy is added to 90 g of water at an initial temperature of 18°C than temperature of the water 21402 K.

The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.

Given in the question 1900 J of heat is added to 90 g of water at an initial temperature of 18°C.

heat = mass*specific heat*change in temperature

1900 = .09 Kg*1*ΔT

ΔT =    21111

final temperature  = 21111 + 291 K

final temperature = 21402 K

1900 J of heat or thermal energy is added to 90 g of water at an initial temperature of 18°C than temperature of the water 21402 K.

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The distance travelled by the race car that is slowed down with a constant acceleration of - 11 m / s² before it comes to a stop is 22 m

a = ( v - u ) / t

a = Acceleration

v = Final velocity

u = Initial velocity

t = Time

a = - 11 m / s²

v = 0

u = 22 m / s

t = ( v - u ) / a

t = ( 0 - 22 ) / - 11

t = 2 s

s = ut + 1 / 2 at²

s = ( 22 * 2 ) + ( 0.5 * - 11 * 2 * 2 )

s = 44 - 22

s = 22 m

Therefore, the car will travel 22 m before it stops

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The statement that is true about energy is as follows;

Kinetic energy is the energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.

Potential energy is the energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass).

The law of conservation of energy is a principle stating that energy may not be created or destroyed but instead can be transformed from one form to another.

This suggests that kinetic energy as a type of energy can be changed into the resting form called potential energy and vice versa.

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The photon rapidly goes towards the 'singularity' at the center of the black hole, and acceleration will increase tremendously towards center of black hole.

The rate at which an item changes its velocity is known as acceleration, a vector variable. If an object's velocity is changing, it is accelerating. A moving object can occasionally alter its velocity by the same amount every second. a moving object that changes its speed by 10 m/s per second. Since the velocity is changing by a fixed amount every second, this is known as a constant acceleration. It is important to distinguish between an item with a constant acceleration and one with a constant velocity. Be not deceived! An object is accelerating if its velocity is changing, whether by a fixed amount or a variable quantity. Additionally, a moving item with a constant speed is not accelerating.

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The energies of the photon in each case are;

a) 2.5 * 10^-5 eV

b) 2.5 eV

c) 2.5 * 10^2 eV

We know that a photon is known to have an energy that can be measured or calculated by the use of the formula;

E = hc/λ

E = energy of the photon

h = Plank's constant

λ = Wavelength

c = Speed of light

Then;

a) E = 6.6 * 10^-34 * 3 * 10^8/5 * 10^-2 m

E = 3.96 * 10^-24 J or 2.5 * 10^-5 eV

b) E = 6.6 * 10^-34 * 3 * 10^8/500 * 10^- 9 m

E = 3.96 * 10^-19 J or 2.5 eV

c) E =  6.6 * 10^-34 * 3 * 10^8/5 * 10^- 9 m

E =  3.96 * 10^-17 or 2.5 * 10^2 eV

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Since the boat is moving in a direction with 5 meters per second without any added force of rowing, it means it is in motion at the same rate of 5 meters. This means the motion is the equivalent to the speed in which it events. Even Newton first law stated ''every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.''

SO: based on the choices the answer is D or The boats motion stays the same!

Answer: D or The boats motion stays the same!

Answer:

It stays the same. D.

Explanation:

If no forces are acting on the boat other than the current the boat's motion should stay the same. Hope you are satisfied with this answer please give me a good rating.

The genral result of the proton-proton chain is the formation of Helium Nucleus i.e., 4 hydrogen combined to form one helium nucleus.

Proton-proton chains are also called p-p chains, proton-proton cycles, or proton-proton reactions.

Roton-Proton Chain.

⁴H ---> He + energy + other

In the proton-proton chain, four hydrogen nuclei (protons) combine to form a helium nucleus. This results in a loss of the original mass. But some energy escapes in the form of neutrinos. First, two hydrogen nuclei (¹H) combine to release a positive electron (e+, positron) and a neutrino (ν) to form a hydrogen 2 nucleus (²H, deuterium).

¹H + ¹H --> ²H + e + ν

The hydrogen 2 nucleus quickly captures another proton to form a helium 3 (³He) nucleus while emitting a gamma (γ) ray.

²H + ¹H --> ³He + γ

From this point, the reaction chain can follow one of several paths, but always leads to a helium-4 nucleus emitting a total of two protons.

³He + He --> ⁴He + ¹H + ¹H

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