Which is a tool used by scientists to determine the composition of objects?

A. a hologram
B. a spectrometer
C. a wave front
D. a prism

Answer:

0.45 J/gC

Explanation:

The heat absorbed by the sample of iron is given by:

[tex]Q=mC_s (T_f-T_i)[/tex]

where:

Q = 1004 J is the heat absorbed

m = 111.6 g is the mass of the sample

Cs is the specific heat capacity of iron

T_f = 20 C is the final temperature of the sample

T_i = 0 C is the initial temperature

Solving the equation for Cs, we find

[tex]C_s = \frac{Q}{m(T_f-T_i)}=\frac{1004 J}{(111.6 g)(20 C-0 C)}=0.45 J/gC[/tex]

Answer:

A glass table able to withstand a normal force of 450 N when a 500 N object is placed on it

Explanation:

An object is said to be in equilibrium when the net force acting on it is zero.

Let's analyze each option:

- A glass table able to withstand a normal force of 450 N when a 500 N object is placed on it.  --> NON-EQUILIBRIUM. In fact, the downward force (the weight of the object, 500 N) is more than the maximum upward normal force (450 N), so the net force is non-zero.

- Two teams pulling a rope in opposite directions, both with a force of 3670 N  --> EQUILIBRIUM. Both forces are equal in magnitude and opposite in direction, so the net force is zero.

- An 80-N rope holding up a 920-N weight with a tension of 1000 N.  --> EQUILIBRIUM. The total force pulling on one side is 80 N + 920 N = 1000 N, which is equal to the force on the other side.

- A 500-newton sign hanging from two chains of insignificant weight, each with a tension of 250 N --> EQUILIBRIUM. The total force pushing on one side is 250 N*2 = 500 N, which is equal to the force on the other side.

HBr has hydrogen ions (H+), not hydroxide ions (OH-).

Therefore, HBr is an acid, which decrease the pH level.

The answer is A.

the answer is D) your welcome :)))

the first one is the answer

Answer:

a

Explanation:

a substance that is not solid

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According to the dictionary, the definition of liquid is, "a substance that flows freely but is of constant volume, having a consistency like that of water or oil."

Check the combination of the horses, review them, you'll get the answer.

Use a piece of cardboard

Put a lubricant between the surface of the object and the floor. use round objects, like pencils, to decrease the friction and push the refrigerator over the pencils

Answer:

B. 50/-8

Explanation:

The expression -50/8 is equivalent to;

-50/8 = -6.25

The expression; 50/-8 is also equal to -6.25

Therefore;

The expression; -50/8 is equal to 50/-8

The efficiency of a machine increases as the temperature inside increases relative to the temperature outside.

Answer:

The correct answer is increases.

Explanation:

According to the second principle of thermodynamics, when two objects at different temperatures come into thermal contact with each other, thermal energy always flows from the hottest object to the coldest.

Therefore we deduce that if the inside temperature of the machine is higher than the outside temperature, the machine will have a higher efficiency.

Have a nice day!

About 2 months depends on the person

To calculate the number of turns in the secondary coil, use the transformer equation. The number of turns in the secondary coil is found by multiplying the ratio of the secondary voltage to the primary voltage by the number of turns in the primary coil.

To calculate the number of turns of wire needed in the secondary coil, we can use the transformer equation. The ratio of the secondary voltage to the primary voltage is equal to the ratio of the number of turns in the secondary coil to the number of turns in the primary coil. In this case, the primary voltage is 2,800 V and it needs to be reduced by 70 V. So, the secondary voltage is 2,800 V - 70 V = 2,730 V. The number of turns in the primary coil is 120. Using the transformer equation, we can find the number of turns in the secondary coil:

Number of turns in the secondary coil = (Secondary voltage / Primary voltage) * Number of turns in the primary coil

Number of turns in the secondary coil = (2,730 V / 2,800 V) * 120

Number of turns in the secondary coil = 117

Therefore, there should be 117 turns of wire in the secondary coil.

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Answer:

In the figure attached we can see in a better way this situation. If we are told the rope is at 60 degress to the horizontal, we can place this rope in the origin of the X-Y coordinate system.

If we observe in detail, we have a right triangle where the opposite side [tex]OS[/tex] to the angle [tex]60\º[/tex] is the vertical component [tex]F_{y}[/tex] and the adjacent side [tex]AS[/tex] is the horizontal component [tex]F_{x}[/tex] . So, we can use trigonometric functions to find the force [tex]F[/tex] (the hypotenuse [tex]h[/tex]) applied to the rope.

For [tex]F_{x}[/tex]:

We can use the trigonometric function cosine, which is defined as:

[tex]cos(60\º)=\frac{AS}{h}[/tex]

This means [tex]F_{x}=Fcos(60\º)[/tex]

[tex]F_{x}=300Ncos(60\º)[/tex]

[tex]F_{x}=150N[/tex]

For [tex]F_{y}[/tex]:

We can use the trigonometric function sine, which is defined as:

[tex]sin(60\º)=\frac{OS}{h}[/tex]

This means [tex]F_{y}=Fsin(60\º)[/tex]

[tex]F_{y}=300Nsin(60\º)[/tex]

[tex]F_{y}=259.8N[/tex]

Finally the horizontal and vertical components are 150 N and 259.8 N

A pulley makes work easier by redistributing the force required to lift an object, providing mechanical advantage and allowing the user to exert less force over a greater distance.

A pulley is a simple machine that consists of a grooved wheel and a rope or cable. It is used to change the direction or magnitude of a force, making it easier to lift or move heavy objects.

The primary concept behind how a pulley makes work easier is the principle of mechanical advantage. Mechanical advantage refers to the ability of a machine to multiply the input force applied to it, resulting in a greater output force. In the case of a pulley, it can provide a mechanical advantage by redistributing the force required to lift an object over a larger distance.

When a force is applied to one end of the rope wrapped around a pulley, the tension in the rope becomes equal throughout its length. This means that the force applied on one side of the pulley is transmitted to the other side with the same magnitude. As a result, the load being lifted is shared between the rope segments on each side of the pulley.

By using multiple pulleys, either in a fixed or movable configuration, a system of pulleys known as a block and tackle can be created. This arrangement allows for further mechanical advantage by increasing the number of rope segments supporting the load. Each additional pulley effectively divides the force required to lift the load, reducing the effort needed.

Therefore, a pulley system allows the user to exert less force over a greater distance, making it easier to lift heavy objects. The mechanical advantage provided by the pulley helps in minimizing the effort required to overcome the resistance or weight of the load, thus making work easier.

To learn more about Ideal mechanical advantage click:

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-is made mostly of hydrogen and helium.

-will eventually run out of fuel and die.

-creates energy through nuclear reactions

Answer:

The sun:

-is the largest star in our solar system

- is made mostly of hydrogen and helium  

-will eventually run out of fuel and die  

-creates energy through nuclear reactions

Explanation:    

The sun an average mass and sized star composed of hydrogen and helium gas. It generates energy in its core by nuclear fusion reaction. It is the only star in the solar system. Once all the fuel is run out, the nuclear fusion reaction would stop and the sun would die. There are billions of stars in our milky way galaxy and sun is not the largest of them.

The number of cards in a deck without jokers is 52. If you draw just one card then the probability is going to have 52 in the denominator

the cards between 2 and 7 in the spade suit are 3 4 5 6. Since you have written "between", 4 cards will be successful.

The answer is P(3,4,5,6) = 4/52 which reduces to 1/13

Answer 1/13.

The odds against drawing a spade greater than 2 and less than 7 from a deck of cards are 25 to 1.

The odds against drawing a spade greater than 2 and less than 7 can be found by determining the probability of drawing a spade greater than 2 and less than 7, and then calculating the complement of that probability. Firstly, we need to determine the number of favorable outcomes, which is 2 (the 3 of spades and the 4 of spades). The number of possible outcomes is 52 (the total number of cards in the deck). Therefore, the probability of drawing a spade greater than 2 and less than 7 is 2/52, or 1/26. The complement of this probability, which represents the odds against drawing a spade greater than 2 and less than 7, is 1 - 1/26 = 25/26. So, the odds against drawing a spade greater than 2 and less than 7 are 25 to 1.

The centripetal acceleration is related to the tangential velocity according to the equation below.  

a=v²/r where v is the tangential velocity and r the radius of the circular path.

thus v²=a×r

From the question provided, r=6m acceleration= 3.6m/s²

Therefore using these values in the formula v²=a×r

v=√(3.6×6)

v=√21.6

v=4.65

The answer is A. 4.65 m/s

Answer:

[tex]4.1\cdot 10^8 N[/tex]

Explanation:

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

[tex]p=p_0 + \rho g h[/tex]

where

[tex]p_0 =1.01\cdot 10^5 Pa[/tex] is the atmospheric pressure

[tex]\rho = 1000 kg/m^3[/tex] is the water density

[tex]g=9.8 m/s^2[/tex] is the gravitational acceleration

[tex]h=11,000 m[/tex] is the depth

Substituting,

[tex]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[/tex]

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

So the total area of the sphere is

[tex]A=4 \pi r^2 = 4 \pi (0.55 m)^2=3.8 m^2[/tex]

And so, the inward force exerted on it is

[tex]F=pA=(1.08\cdot 10^8 Pa)(3.8 m^2)=4.1\cdot 10^8 N[/tex]

The total inward force is about 4.1 × 10⁸ N

[tex]\texttt{ }[/tex]

Let's recall Hydrostatic Pressure formula as follows:

[tex]\boxed{ P = \rho g h}[/tex]

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!

[tex]\texttt{ }[/tex]

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:

[tex]F = P A[/tex]

[tex]F = ( P_o + \rho g h ) A[/tex]

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

[tex]F = ( 10^5 + 1000 \times 9.8 \times 11000 ) ( \pi \times 1.1^2 )[/tex]

[tex]F \approx 4.1 \times 10^8 \texttt{ Newton}[/tex]

[tex]\texttt{ }[/tex]

The total inward force is about 4.1 × 10⁸ N

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Pressure

(1.6 x 10⁻¹⁹ C) x (300 N/C) = 4.8 x 10⁻¹⁷ Newton

The force experienced by the electron is 4.8×10⁻¹⁷ N.

Electric Field: An electric field is a region or space, where an electric force can be experienced or felt.

The formula of electric force is

F = E×Q............... Equation 1

Where F = Electric force, E = Electric field, Q = Charge.

From the question,

Given: Q = 1.6×10⁻¹⁹ C, E = 300 N/C

Substitute these values into equation 1

F = (1.6×10⁻¹⁹)(300)

F =  4.8×10⁻¹⁷ N.

Hence, The force experienced by the electron is 4.8×10⁻¹⁷ N.

Learn more about electric Field here:  https://brainly.com/question/22735564  

It would be 7.22 degrees Celsius.

Steps: (45°F − 32) × 5/9 = 7.222°C

the friction would cause the box to move slower

D. center seeking. Good Luck

Answer: The correct answer is "center-seeking".

Explanation:

Centripetal force is the force which is required to keep the body in the circular motion. The direction of the centripetal force is towards center of the circle.

The expression for the centripetal force is as follows;

[tex]F= \frac{mv^{2} }{r}[/tex]

Here, r is the radius, v is the velocity and m is the mass of the object.

Without this force, the body cannot move in the circular motion. Then, it follows the straight line motion.

The direction of the centripetal force acting on a ball on a string being spun in a circle around a person is center-seeking.

Therefore, the correct option is (D).

In a closed system, when two or more particles collide, the sum of momentum of two particles before and after collision will always be the same. In elastic collision, kinetic energy and momentum of a particle remains conserved. Whereas in inelastic collision, momentum remains same before and after collision but some of the particle's kinetic energy may be converted to other forms of energy.

A moving particle or object may possess kinetic energy and it depends mainly on its motion and mass. The kinetic energy is converted into potential energy and converted back to kinetic energy during collision of small particles.

Answer:The answer is B

Explanation:

A generator produces electricity. Energy enters the system (generator) as kinetic energy. It is converted into electrical energy, which can run electrical appliances. Some energy is always wasted as heat and sound. Therefore, Choice B is the best answer.

Answer:

B

Explanation:

it shows the best answer

Sound waves are longitudinal mechanical waves, that is, they depend on a medium to propagate.

Among the characteristics of a sound wave, it is the amplitude, that is the degree of movement of the molecules of the medium in which the wave propagates.  

Depending on how high this amplitude is, the sound will be louder.

Answer:

1. height

2. loudness

Answer:

Pressure increases

Explanation:

Gay- Lussac's law gives the relationship between pressure and the temperature. There exists a direct relationship between temperature and pressure as per Gay- Lussac's law as :

At constant volume, [tex]pressure\propto temperature[/tex]

It is clear that pressure and temperature are directly proportional to each other. So, if temperature increases, pressure also increase. Hence, the correct option is (A) " Pressure increases ".

Answer: the pressure increases!

From this particular list of choices, only A. increasing the mass of the object can increase the gravitational attraction between the object and the Earth.

Choices B and C have exactly the opposite effect, and choice-D has no effect at all.

This is all just a complicated, technical way of saying that if you eat a big steak plus a few shakes, your mass increases, and you WILL gain weight.

Answer:

A

Explanation:

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It is the use of a (usually) mechanical means to create something physical that uses some scientific principle that will be used in war or for the betterment of man or both.

It is a machine that creates destruction or good or both that uses some sort of scientific basis of which it is an application.

This belongs in the bio section but the structure are the chromosomes that contain the DNA strands themselves containing the genetic information of any living things

the answer your looking for is Optical instrument.

-- microscope

-- eyeglasses

-- telescope (refracting type)

All you have to do is get the culmative effect of the forces by predicting the direction in which each object will move. Just write down what you know and put down questions for your teacher.