Physics High School

## Answers

**Answer 1**

Answer:

A

Explanation:

An antifreeze is a substance which when added to a liquid reduces the freezing point of the liquid. Hence the solution can only freeze at a lower temperature compared to the solvent. Examples of antifreeze includes salt and propylene glycol. Antifreeze are used in low temperature environments to prevent water from freezing quicky. Hence the answer is A.

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## Related Questions

When two waves overlap, the displacement of the medium is the sum of the displacements of the two individual waves. This is the principle of __________.

### Answers

Answer:

Superposition principle

Explanation:

When two waves overlap, the displacement of the medium is the sum of the displacements of the two individual waves. This is the principle of superposition. The resultant displacement is equal to the sum of displacements of the individual wave. For example, in a string the displacement of any part of the string is equal to the displacement caused due to each wave.

When monochromatic light passes through the interface between two unknown materials at an angle θ where 0∘<θ<90∘, no changes in the direction of propagation of light are observed. What can be said about the two materials?A. The twomaterials have matching indexes ofrefraction. B. Thesecond material through which light propagates has a lower index ofrefraction.

C. Thesecond material through which light propagates has a higher indexof refraction.

D. The twomaterials are identical.

### Answers

Answer:

A

Explanation:

According to Snell's law refractive index is the ratio of the sine of the angle of incidence to the normal to the barrier ( the normal is perpendicular to the surface of the barrier) to the ratio of the sine of refraction ( the angle of emergence from the second barrier) and also equals the ratio of the speed of light in the first barrier to the ratio of the speed of light in the second barrier.

Since there is no change in the direction of the propagation of light then the two materials must have matching indexes of refraction.

Answer:

A. The two materials have matching indices of refraction.

Explanation:

We know that when light moves from one medium to another, usually, it undergoes a process of bending, called Refraction.

This is due to the fact that the two media have different indices of refraction. This means that when the light wave enters the second medium from the first, its speed changes (and ultimately, its wavelength also changes).

So, if light passes through an interface between two media and the direction of the propagation of light does not change, then, it would mean that both media have the same refractive index.

When the voltage and current have _____ polarities in a pure capacitive circuit, the capacitor is discharging and the energy is returned to the circuit.

### Answers

Answer:opposite

Explanation:for a capacitor to discharge (after charging) the polarities of the current and voltage have to be reversed

Which statement about the horizontal distance covered by a projectile launched at an angle less than 90° is true? A.

The distance covered in equal time intervals is equal.

B.

The distance covered in equal time intervals increases.

C.

The distance covered in equal time intervals decreases.

D.

No horizontal distance is covered.

### Answers

Answer: A

Explanation because the distance covered is equal time intervals is the same or equal.

Answer:

A

Explanation:

A white dwarf in a binary system suddenly flares, but in a few months it settles back to its original luminosity. This process may repeat many times. What object is it?

### Answers

Answer:

A Pulsar

Explanation:

Such white dwarf is a Pulsar (from pulsating star). Three main features we find in this kind of celestial body

1. Incredibly high density, in a pulsar there is not what we can define as free interspace. Everything is mass

2.- Huge rotational speed (more than hundreds of kilometer) spinning at more than hundreds of kilometer per second

3.-Intense magnetic field

Combinations of thse features make pulsar emits important amount of energies with pricese periods of time. And if on earth we look a jet of electromagnetic radiation with a precise rigurosity (at pricese period of time) is because we are looking a pulsar spinning and each time the radiation appears is a turn of the pulsar

I'm a tiny spot in the northern sky, Deeply exposed as ten days went by. I have very few stars, but contain So many dots to boggle the brain! Some of those dots are so far away! Scientists studied me, then could say The number of galaxies revealed! What am I? I'm the _____.

### Answers

Answer:

The milky way.

Explanation:

Key words: galaxies, revealed. (I think)

A stream begins at an elevation of 500 meters above sea level and flows over a distance of 200 kilometers to the ocean. What is the average gradient?

### Answers

Answer:

Explanation:

given,

elevation of the stream = 500 m

distance of the ocean = 200 Kilometer

average gradient = ?

gradient is the increase in height of the flow with respect to the horizontal distance traveled.

gradient =

gradient =

Hence, the average gradient of the stream is equal to

Which of the following quantities provide enough information to calculate the tension in a string of mass per unit length μ that vibrates with a frequency f?A. the wave speed v and ? B. the wavelength ? and f

C. the wave speed v and f

D. the wavelength ? and ?

### Answers

Answer:

A. the wave speed v and Wavelength

Explanation:

Given that

Mass density per unit length=μ

Frequency = f

The velocity V given as

T=Tension

V=Velocity

V= f λ

λ=Wavelength

Therefore to find the tension ,only wavelength and speed is required.

The answer is A.

A thermometer is removed from a room where the temperature is 70° F and is taken outside, where the air temperature is 10° F. After one-half minute the thermometer reads 40° F. What is the reading of the thermometer at t = 1 min? (Round your answer to two decimal places.) 13.75 Incorrect: Your answer is incorrect. ° F How long will it take for the thermometer to reach 20° F? (Round your answer to two decimal places.) 0.29 Incorrect: Your answer is incorrect. min

### Answers

Answer:

a. 70° F b. 0.17min

Explanation:

The fahrenheit scale to time can be given with the following mathematical relation

f2=?

f0=10° F

f1=40° F

t2=1min

t0=0

t1=1/2min

f2-10=60

f2=70° F

b. Goin by the previous relation

30/10=0.5/t0

30t0=5

t0=1/6

t0=0.16666666666666666666666666666667

t0=0.17min

from this, it can concluded that temperature outside increases with time

Before a Journeyman Electrical Worker's license is granted to an applicant by a governmental agency, the individual is tested primarily on his or her ? .

### Answers

Explanation:

The individual are tested on their ability to check the working knowledge and ability to use code. As the codes and lengthy and complicated one has to have a good acumen to learn and understand them. Moreover, incomplete knowledge of code to cause hazardous accidents and loss of life and property. Therefore, they are thoroughly tested for their knowledge and ability to use codes.

At a depth of 10.9 km, the Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest site in any ocean. Yet, in 1960, Donald Walsh and Jacques Piccard reached the Challenger Deep in the bathyscaph Trieste. Assuming that seawater has a uniform density of 1024 kg/m3, approximate the hydrostatic pressure (in atmospheres) that the Trieste had to withstand.

### Answers

Answer:

Explanation:

As we know that the pressure inside the liquid level is given as

here we have

h = 10.9 km

also we know that

now we have

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 33.0 g, a specific heat capacity of c = 804 J/(kg C°), and a temperature of 15.4 °C. It is immersed in 149 g of water, and the final temperature of the water and thermometer is 56.0 °C. What was the temperature of the water in degrees Celsius before the insertion of the thermometer?

### Answers

Answer : The temperature of water is,

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

where,

= specific heat of thermometer =

= specific heat of water =

= mass of thermometer = 33.0 g

= mass of water = 149 g

= final temperature =

= initial temperature of thermometer =

= initial temperature of water = ?

Now put all the given values in the above formula, we get:

Therefore, the temperature of water is,

Use Bernoulli's Equation to find out how fast water leaves an opening in a water tank. The water level is 0.75 m above the opening. The top of the water tank is opened to the atmosphere.

### Answers

Answer:

3.84 m/s

Explanation:

Using Bernoulli's equation below:

P1 + (1/2ρv1²) + h1ρg = P2 + (1/2ρv2²) + h2ρg

where P1 = P2 atmospheric pressure

(1/2ρv1²) + h1ρg = (1/2ρv2²) + h2pg

collect the like terms

h1ρg - h2ρg = (1/2ρv2²) - (1/2ρv1²)

factorize the expression by removing the like terms on both sides

gρ(h1 - h2) = 1/2ρ( v2² - v1²)

divide both side by rho (density in kg/m³, ρ )

g(h1 - h2) = 1/2 (v2² - v1²)

assuming the surface of the tank is large and the speed of water then at the tank surface v1 = 0

2g(h1 - h2) = v2²

take the square root of both side and h1 - h2 is the difference between the surface of the tank and the opening where water is coming out in meters

√2g(h1 - h2) = √ v2²

v2 = √2g(h1-h2) = √ 2 × 9.81×0.75 = 3.84 m/s

A 2200 kg truck has put its front bumper against the rear bumper of a 2400 kg SUV to give it a push. With the engine at full power and good tires on good pavement, the maximum forward force on the truck is 18,000 N. a. What is the maximum possible acceleration the truck can give the SUV?

b. At this acceleration, what is the force of the SUV's bumper on the truck's bumper?

### Answers

Answer:

a) The maximum possible acceleration the truck can give the SUV is 7.5 meters per second squared

b) The force of the SUV's bumper on the truck's bumper is 18000 newtons

Explanation:

a) By Newton's second law we can find the relation between force and acceleration of the SUV:

With F the maximum force the truck applies to the SUV, m the mass of the SUV and a the acceleration of the SUV; solving for a:

b) Because at this acceleration the truck's bumper makes a force of 18000 N on the SUV’s bumper by Third Newton’s law the force of the SUV’s bumper on the truck’s bumper is 18000 N too because they are action-reaction force pairs.

Nuclear decay occurs according to first-order kinetics. Cobalt-60 decays with a rate constant of 0.131 years−1. After 5.00 years, a sample has a mass of 0.302 g. What was the original mass of the sample?

### Answers

Answer : The original mass of the sample was 0.581 grams.

Explanation :

Expression for rate law for first order kinetics is given by:

where,

k = rate constant =

t = time passed by the sample = 5.00 years

a = original or initial amount of the reactant = ?

a - x = amount left after decay process = 0.302 g

Now put all the given values in above equation, we get

Therefore, the original mass of the sample was 0.581 grams.

A diffraction grating is illuminated simultaneously with red light of wavelength 660 {\rm nm} and light of an unknown wavelength. The fifth-order maximum of the unknown wavelength exactly overlaps the third-order maximum of the red light.What is the unknown wavelength? (in nm)

### Answers

Answer:

Explanation:

As we know that position of maximum on the screen in diffraction pattern is given as

here we know that

position of third maximum due to red color light and position of fifth maximum of unknown wavelength are same

so we have

so we have

With a magnetic field strength of 1.41 tesla, all of the protons in organic compounds will resonate over a narrow range of frequencies near 60 MHz. With a magnetic field strength of 7.04 tesla is employed, all of the protons in organic compounds will resonate over a range of frequencies near

### Answers

Answer:

300 MHz

Explanation:

A resonance is obtained when oscillating frequency of magnetic field becomes approximately equal to intrinsic frequency of particles in the nuclei

this method is used in Nuclear Magnetic Resonance or NMR

here the resonant frequency is directly proportional to the strength of magnetic field

from the question,

initial Magnetic Field = 1.41 Tesla

Initial resonant frequency = 60 MHz

final Magnetic Field = 7.04 Tesla

final resonant frequency =

You get lost in extremely cold weather. You are unable to start a fire. Which of the following is the best way to survive? Wrap up in a thermal foil blanket. Cover yourself in snow for insulation. Change from wool to cotton clothing if available. Exercise vigorously to stay warm.

### Answers

Answer:

Wrap up in a thermal foil blanket

Explanation:

Thermal foil blanket reflects the heat of the body back to the body. In this way they keep hot the body of the wearer. You cannot cover yourself with snow because you will freeze and ultimately die. Wool clothes are warmer than cotton so, it is not good choice to change cloths from wool to cotton. If you will do exercise vigorously, you will be tired soon. Hence, warp up in a thermal foil blanket is the correct answer.

Answer:

Wrap up in a thermal foil blanket

Explanation:

Certain nuclear radiation that is passed through the electric field (above) is deflected towards the red plate. In what way is the nucleus changed by this type of decay?

A)A proton is converted to a neutron.

B)A neutron is converted to a proton.

C)A positron is converted to an alpha particle.

D)There is no change to the nucleus because the mass remains remain the same.

### Answers

Answer:

B) A neutron is converted to a proton.

Explanation:

Answer:

B

Explanation:

As a skateboarder moves downhill, some of the energy of the skateboarder is A)lost.

B)kinetic.

C)potential.

D)kinetic and some is potential.

### Answers

Answer:

D) kinetic and some potential.

Explanation:

As the skateboard moves it gains kinetic energy and losses some potential energy, so I would say that it has more kinetic energy than potential energy, but it still has both.

As the skateboard rolls down the ramp it loses potential energy and gains kinetic energy.

**Other Questions**

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Let WWW represent the sumo wrestler's weight (in kilograms) after ttt months. Complete the equation for the relationship between the weight and number of months.