Answer: 500 ft
Explanation:
High beam headlights help one to see better at night as the range of vision is greatly expanded. They can however, blind drivers coming on the opposite lane.
It is therefore prudent to ensure that when using high beam headlights, you dim them when a car is coming towards you. The appropriate distance to do so is a minimum of 500 ft from the car.
PLEASE HELP: A planet has an average distance to the sun of 3.36AU. In two or more complete sentances, explain how to calculate the orbital peroid of the planet and calculate it.
Answer:
Use the AU formula
Explanation:
1 astronomical unit = 149597871 kilometer
How can you distinguish
between a reliable and
non-reliable source of
information?
Answer:
The answer to this question is given below in this explanation sections.
Explanation:
Reliable sources:
When researching you always need to be sure that you are getting your information from reliable sources.Some sources are considered to be" reliable" because they have been written by people who are experts in the field.These are the sources you canun reliable sources:
on the other hand some sources are not reliable because may not have a through knowledge or full understanding a topic.anyone you can post information on the internet we need to be critical reader to order determined.differentiate between basic quantities and physical quantities
Answer:
Base quantities are the minimum numbers of the physical quantities. Base quantities are defined as the physical quantities which can not be defined in terms of other physical quanities. There are seven base quantities. Physical Quantitie Units Derived Quantities are defined as those physical quantities which are derived from the base quantities.
Explanation:
A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as the combination of a numerical value and a unit. For example, the physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit. A physical quantity possesses at least two characteristics in common, one is numerical magnitude and other is the unit in which it is measured.
Distinguish between a basic physical quantity and a derived physical quantity giving an example of each. Answers. Basic physical quantities are quantities which can be obtained without derivation. e.g Temperature. While derived physical quantities are quantities which can only be obtained from other physical quantities.
Two masses, m1 & m2 are separated by a distance of 12 m between their centers. The gravitational force attraction between the two masses is measured to be 6.0 x 10-6 N. The masses are then moved closer to one another, to a distance of 4 m between centers, and the resulting gravitational force is measured again. According to the Universal Law of Gravitation, the second measurement is
The universal law of gravitation says that the gravitational force between the two masses is
F₁ = G m₁ m₂ / r ² = 6.0 × 10⁻⁶ N
where r = 12 m. When the distance between the two masses is reduced to R = 4 m, i.e. 1/3 of the original distance r, we have
F₂ = G m₁ m₂ / R ² = G m₁ m₂ / (r/3)² = 1/9 G m₁ m₂ / r ² = 1/9 F₁
so that the resulting gravitational force has 1/9 the first magnitude, or
F₂ = 1/9 (6.0 × 10⁻⁶ N) ≈ 6.7 × 10⁻⁷ N
Question 7 of 10
Which three statements describe electromagnetic waves?
A. They can transfer energy through a vacuum.
I B. They vibrate parallel to the direction in which the wave travels.
O C. They vibrate in two directions that are perpendicular to each
other.
D. They radiate outward in all directions.
Answer:
A. They can transfer energy through a vacuum
C. They vibrate in two directions that are perpendicular to each other
D. They radiate outward in all directions
Explanation:
A statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.
What is an electromagnetic wave?The waves that are related to both electricity and magnetism are known as electromagnetic (EM) waves. These waves are made up of time-varying electric and magnetic fields that travel over space.
The correct statements are:
They can transfer energy through a vacuum.They vibrate in two directions that are perpendicular to each other.They radiate outward in all directions.Thus, a statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.
Learn more about the electromagnetic wave here:
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Two cylinders A&B at the same temperature contains the same quantity of the same kind of gas. Cylinder A has three times the volume of cylinder B. What can you conclude about the pressure the gases exert
Answer:
pressure in cylinder A must be one third of pressure in cylinder B
Explanation:
We are told that the temperature and quantity of the gases in the 2 cylinders are same.
Thus, number of moles and temperature will be the same for both cylinders.
To this effect we will use the formula for ideal gas equation which is;
PV = nRT
Where;
P is prrssure
V is volume
n is number of moles
T is temperature
R is gas constant
We are told that Cylinder A has three times the volume of cylinder .
Thus;
V_a = 3V_b
For cylinder A;
Pressure = P_a
Volume = 3V_b
Number of moles = n
Thus;
P_a × 3V_b = nRT
For cylinder B;
Pressure = P_b
Volume = V_b
Number of moles = n
Thus,
P_b × V_b = nRT
Combining the equations for both cylinders, we have;
P_a × 3V_b = P_b × V_b
V_b will cancel out to give;
3P_a = P_b
Divide both sides by 3 to get;
P_a = ⅓P_b
Thus, pressure in cylinder A must be one third of pressure in cylinder B
Nuclear power plants produce a waste product of cesium-137, which has a half-life of 30 years. How long would it take for the cesium to decay to 1/8 of its original amount?
90 years
120 years
30 years
60 years
C. A rock falls for 4 seconds. How far did it fall
Answer:
Calculates the free fall distance and velocity without air resistance from the ... for 24 seconds so i asumed that he fell for twelve seconds and this did the rest of it.
Explanation:
If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall 122.625 m
What are the three equations of motion?Newton provided three equations of motion.
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall
S = ut + 1/2at²
u= 0 m/s , a=9.81 m/s² and t =4seconds
S = 0+ 0.5*9.81*5²
S= 122.625 m
Thus, the rock would fall 122.625 m if it falls for 4 seconds
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If a 5 n force is pushing upward on an object what force would need to be applied to create a net force of zero?
Answer:
the foce aplied to make the net force be 0 is 5n force pushing downward on the object becasue it will cancel it out
Explanation:
Do not bounce as stretching because this can cause muscle fibers to shorten, not lengthen, causing injury to the muscles
True or False
Answer:
True
Explanation:
I searched it up :)
Which object has the most potential energy...
ASAP
Sasha lifts a couch 8.2 meters from the ground floor of her house to the attic. If the couch has a mass of 120 kg, what is the gravitational potential energy gained by the couch? Estimate g as 9.81 m/s^2.
Answer:
9653.04 joules
Explanation:
H= 8.2 m
M= 120 kg
G= 9.81 m/s^2
P.E= ?
P.E = MGH
P.E = 120 x 9.81 x 8.2
P.E = 9653.04 joules
A 15.0-kg block is dragged over a rough, horizontal surface by a 70.0-N force acting at 20.0° above the horizontal. The block is displaced 5.00 m, and the coefficient of kinetic friction is 0.300. Find the work done on the block by a) The 70-N force, b) The normal force, and c) The gravitational force. D) What is the increase in internal energy of the block-surface system due to friction? E) Find the total change in the block's kinetic energy.
Answer:
Explanation:
from the question we are told that
Load [tex]L=15kg[/tex]
Force[tex]F=70N[/tex]
Angle of inclination [tex]=20.0 degres[/tex]
Displacement [tex]m=5 meters[/tex]
coefficient of kinetic friction [tex]\alpha =0.300[/tex]
no work is said to be done by standing man carrying 500kg load.why?
Answer:
no work is said to be done by standing man carrying 500kg load because
Explanation:
for the work to be done there should be two conditions i.e force should be applied and displacement must be covered.So for a man carring a 500 kg load force is there but he covers no distance by standing so displacement will be zero and since
work =force\displacement
displacement is zero so we can say that no work is done
In a convection current, why does cool air take the place of warmer air?
1.Cool air is denser than warm air, so it sinks to take the place of rising warm air.
2.Cool air is less dense than warm air, so it sinks to take the place of rising warm air.
3.Cool air is denser than warm air, so it rises to take the place of sinking warm air.
Answer:
1. Cool air is more dense than warm air so it sinks to take the place of the warm rising/buoyant air.
Explanation:
This is why heating a room with cold outside walls or glass windows (if budget can afford), we use warm radiant heaters at the floor level to break up the convection current/cold draft.
As opposed to just diffusing air at the ceiling level, which is good in summer as cool air falls (air conditioning is in range of 55 to 65 degf out of the diffuser), mixing with warmer room air.
18)
Swimmers speed along the river (downstream) is 20km/hr
and can swim Cupstream) at 8km lhr. calculate the
velocity of the stream and the swimmer's possible
speed in still water,
Answer:
The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h
Explanation:
Relative Speeds
When swimming downstream, the velocity (speed, really) of the stream (Vs) and the speed of the swimmers (Vm) are collaborative. When swimming upstream the speed of the stream subtracts to the speed of the swimmers, thus:
Vm + Vs = 20
Vm - Vs = 8
Adding both equations:
2Vm = 28
Vm = 28/2 = 14
From the first equation:
Vs = 20 - Vm = 20 - 14 = 6
The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h
If an area has high air pressure and low humidity, what type of weather will it most likely have?
Answer:
c
Explanation:
At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?emperature of 30°C?
77°F
95°F
280K
300K
Answer:
95 degree Fahrenheit
Explanation:
Explanation:
First we convert these temperatures into °C:
77°F = 25°C
95°F = 35°C
280K = 6.85°C
300K = 26.85°C
When temperature increases, water molecules have a greater average kinetic energy ans are more likely to collide with each other.
Out of the 4 temperatures, only 95°F (35°C) is of a higher temperature than 30°C. Hence 95°F is the answer.
(physical science) could someone please help me out with this lab? if i’m being honest i did the lab but i lost all of my work :( if anyone could help at all that would be great . i am in a bind right now
Explanation:
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It has been known for many years that ceramics can conduct electricity. In 2008, scientists found a ceramic material that can conduct electricity with no resistance at 133 K. What is the most important significance of this 2008 finding?
This is a lower temperature than Onnes’s experiment, and it will allow for a broader use of superconductors.
This is a higher temperature than Onnes’s experiment, and it will allow for a broader use of superconductors.
Materials that can conduct electricity with no resistance are new and can allow for new materials to be made.
Ceramic materials have been known to be able to conduct electricity prior to year 2008.
Answer:
mercury
Explanation:
edge 2020
Which two terms describe salt (NaCl)?
A. Mixture
B. Compound
C. Element
D. Pure substance
Answer:
B. compound
Explanation:
Because Salt (NaCl), sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes called common salt to distinguish it from a class of chemical compounds called salts.
Answer:
B and either C or D
Explanation:
Nuclear fusion is more reliable and sustainable source of energy than nuclear fission chain reaction justify this statement with plausible arguments
Answer:
1. Nuclear fusion does not generate radioactive nuclear wastes as nuclear fission does.
2. Nuclear fusion cannot lead to disastrous powerplant explosions as nuclear fission does.
3. More energy is generated during nuclear fusion than in nuclear fission.
Explanation:
Nuclear fusion involves the combination of lighter atoms such as hydrogen to form a heavier nucleus, in the process producing a tremendous amount of energy.
Nuclear fission on the other hand involves splitting a heavy nucleus into two lighter nuclei, releasing energy in the process.
Nuclear fusion can be more reliable than nuclear fission in energy generation due to the following reasons:There are no radioactive waste products obtained as a result of nuclear fusion, unlike nuclear fission. This is because the elements involved in Nuclear fusion are relatively radioactively stable elements.The risk of nuclear powerplant explosion due to out of control chain reactions is reduced in nuclear fusion because the reaction can only occur in perfect conditions under high pressure and temperatures (e.g the sun). When any of these conditions is removed due to a fault, the reaction automatically stops.More energy is generated during nuclear fusion than in nuclear fission.Nuclear fusion and fission release a tremendous amount of energy using radioactive material as a fuel.
What are Fusion and fission?Nuclear fusion is a reaction that occurs when two nuclei merge to form a larger nucleus and release a massive quantity of energy.
The breaking of two nuclei into smaller nuclei is known as nuclear fission. Nuclear fission also releases a significant amount of energy.
The key is how tightly the nucleons in a nucleus are bound together. The surplus energy will be released if a nuclear reaction produces nuclei that are more closely bonded than the originals. The most securely bound atomic nuclei are found to be around the size of iron-56. Thus,
When a nucleus significantly larger than iron is broken into tiny bits, energy is released since the smaller fragments have lower energy.
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Name three items to remember when completing a job application.
1. ) It's good to remember contact information such as phone number or email.
2.) Your address, so if they need to mail anything to you, they can. This is also a necessary point of information on most job applications anyway.
3.) Past job experiences and ways to contact them. This is probably one of the most important things as it shows you've worked before and are willing to talk to past employers.
May I have brainliest please? :)
Answer:
the other answer is correct
Explanation:
i do flvs and this was on the career final exam
Two sound waves, from two different sources with the same frequency, 540 Hz, travel in the same direction at 330 m s . The sources are in phase. What is the phase difference of the waves at a point that is 4.40 m from one source and 4.00 m from the other?
Answer:
The value is [tex]\Delta \phi = 4.12 \ rad[/tex]
Explanation:
From the question we are told that
The frequency of each sound is [tex]f_1 = f_2 = f = 540 \ Hz[/tex]
The speed of the sounds is [tex]v = 330 \ m/s[/tex]
The distance of the first source from the point considered is [tex]a = 4.40 \ m[/tex]
The distance of the second source from the point considered is [tex]b = 4.00 \ m[/tex]
Generally the phase angle made by the first sound wave at the considered point is mathematically represented as
[tex]\phi_a = 2 \pi [\frac{a}{\lambda} + ft][/tex]
Generally the phase angle made by the first sound wave at the considered point is mathematically represented as
[tex]\phi_b = 2 \pi [\frac{b}{\lambda} + ft][/tex]
Here b is the distance o f the first wave from the considered point
Gnerally the phase diffencence is mathematically represented as
[tex]\Delta \phi= \phi_a - \phi_b = 2 \pi [\frac{ a}{\lambda} + ft ] - 2 \pi [\frac{b}{\lambda} + ft ][/tex]
=> [tex]\Delta \phi = \frac{2\pi [ a - b]}{ \lambda }[/tex]
Gnerally the wavelength is mathematically represented as
[tex]\lambda = \frac{v}{f}[/tex]
=> [tex]\lambda = \frac{330}{540}[/tex]
=> [tex]\lambda = 0.611 \ m[/tex]
=> [tex]\Delta \phi = \frac{2* 3.142 [ 4.40 - 4.0 ]}{ 0.611 }[/tex]
=> [tex]\Delta \phi = 4.12 \ rad[/tex]
Calculate the total energy transferred when 200 g of ice cubes at 0°C are changed to steam at 100°C.
Specific heat capacity of water = 4200 J/kg °C
Specific latent heat of fusion = 340 kJ/kg
Specific latent heat of vaporisation = 2260 kJ/kg
Answer:
[tex]604000\ \text{J}[/tex]
Explanation:
m = Mass of ice = 200 g
[tex]\Delta T[/tex] = Temperature change of water = [tex](100-0)^{\circ}\text{C}[/tex]
c = Specific heat capacity of water = 4200 J/kg °C
[tex]L_f[/tex] = Specific latent heat of fusion = 340 kJ/kg
[tex]L_v[/tex] = Specific latent heat of vaporisation = 2260 kJ/kg
Heat required to convert ice to water = [tex]mL_f[/tex]
Heat required to raise the temperature of water to boiling point = [tex]mc\Delta T[/tex]
Heat required to convert water to steam = [tex]mL_v[/tex]
Total heat required
[tex]q=mL_f+mc\Delta T+mL_v\\\Rightarrow q=m(L_f+c\Delta T+L_v)\\\Rightarrow q=0.2(340\times 10^3+4200(100-0)+2260\times 10^3)\\\Rightarrow q=604000\ \text{J}[/tex]
Heat required to convert the given amount of ice to steam at the required temperature is [tex]604000\ \text{J}[/tex].
A driver slows down her car from 32.7 km/hr at a constant rate of 0.63 m/s2 just by taking her foot of the accelerator (the gas pedal). Calculate the distance the car travels during the sixth second (between t=5 and t=6 seconds)that she is coasting.
Answer: She moves 5.616 meters in that second.
Explanation:
If we define t = 0s as the moment when she starts decelerating we can write the function of acceleration as:
a(t) = -(0.63 m/s^2)
where the negative sign is because she is slowing down.
The velocity equation can be found if we integrate over time:
v(t) = -(0.63m/s^2)*t + v0
Where v0 is the constant of integration, that represents the initial velocity, in this case is:
v0 = 32.7 km/h
Now, because the acceleration is in m/s^2, we should write this velocity in m/s.
in one km we have 1000 meters, and in one hour we have 3600 seconds, then we have that:
32.7 km/h = 32.7 *(1000/3600) m/s = 9.08 m/s
Then the velocity equation becomes:
v(t) = -(0.63m/s^2)*t + 9.08 m/s
And for the position equation, we should integrate again to get:
p(t) = -(1/2)*(0.63m/s^2)*t^2 + (9.08m/s)*t + p0
Where p0 is the initial position.
For this problem, we want to find the distance that she moved between t = 5s and t = 6s, and that can be calculated as:
D = p(6s) - p(5s)
D = -(1/2)*(0.63m/s^2)*(6s)^2 + (9.08m/s)*6s + p0 +(1/2)*(0.63m/s^2)*(5s)^2 - (9.08m/s)*(5s) - p0
D = -(1/2)*(0.63m/s^2)*((6s)^2 - (5s)^2) + (9.08m/s)*(6s - 5s)
D = 5.615 m
She moves 5.616 meters in that second.
A football kicked in front of a goal post at an angle of 45 degree to the ground just clear the top by of the post 3m high. Calculate the velocity of projection and the time taken to hit the ground again from the instant it was kicked.
Answer:
A. 10.84 m/s
B. 1.56 s
Explanation:
From the question given above, the following data were obtained:
Angle of projection (θ) = 45°
Maximum height (H) = 3 m
Acceleration due to gravity (g) = 9.8 m/s²
Velocity of projection (u) =?
Time (T) taken to hit the ground again =?
A. Determination of the velocity of projection.
Angle of projection (θ) = 45°
Maximum height (H) = 3 m
Acceleration due to gravity (g) = 9.8 m/s²
Velocity of projection (u) =?
H = u²Sine²θ / 2g
3 = u²(Sine 45)² / 2 × 9.8
3 = u²(0.7071)² / 19.6
Cross multiply
3 × 19.6 = u²(0.7071)²
58.8 = u²(0.7071)²
Divide both side by (0.7071)²
u² = 58.8 / (0.7071)²
u² = 117.60
Take the square root of both side
u = √117.60
u = 10.84 m/s
Therefore, the velocity of projection is 10.84 m/s.
B. Determination of the time taken to hit the ground again.
Angle of projection (θ) = 45°
Velocity of projection (u) = 10.84 m/s
Time (T) taken to hit the ground again =?
T = 2uSine θ /g
T = 2 × 10.84 × Sine 45 / 9.8
T = 21.68 × 0.7071 / 9.8
T = 1.56 s
Therefore, the time taken to hit the ground again is 1.56 s.
HELP PLS ITS BEEN AN 3 HOURS
Answer:
0.433 s
Explanation:
Let's break the projectile motion into its horizontal and vertical components:
Horizontal component (x):
3.22 * cos(62.9)Vertical component (y):
3.22 * sin(62.9)We want to find the time required for the hurdler to travel a distance of 0.635 m. In order words, his displacement should be 0.635 m in the x-direction.
Since we don't have the final velocity, we can use this constant acceleration equation:
Δx = v₀t + 1/2at²We have three known variables and want to solve for t. Using this equation in the x-direction, we have:
Δx = 0.635 mv₀ = 3.22 * cos(62.9)a = 0 m/s² t = ?Substitute these values into the equation.
0.635 = [3.22 * cos(62.9)] t + 1/2(0) t²Simplify the equation.
0.635 = 3.22 * cos(62.9) tDivide both sides by the horizontal component of the initial velocity.
0.432899075 = tSince we start with 3 sig figs, we will round this value to 0.433. The time it takes to clear the hurdle is 0.433 seconds.
Kate is riding on a train and notices that the wildflowers by the side of the tracks seem to be moving by much faster than the mountains in the distance. This is an example of
Answer: motion parallax
Explanation:
Motion parallax refers to a form of depth perception whereby objects that are closer to an individual appears to move at a faster speed than the objects that are far.
Therefore, Kate is riding on a train and notices that the wildflowers by the side of the tracks seem to be moving by much faster than the mountains in the distance is an example of motion parallax.
A marble, rolling with speed of 20m/sec rolls off the edge of the table that is 180m high (g=10m/sec2), find time taken to drop to the ground.
a. 10sec
b. 8sec
c. 6sec
d. 12sec
Answer:
Choice: c. 6sec
Explanation:
Horizontal Launch
When an object is thrown horizontally with a speed (v) from a height (h), it describes a curved path ruled by gravity until it finally hits the ground.
The horizontal component of the velocity is always constant because no acceleration exists in that direction, thus:
[tex]v_x=v[/tex]
The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:
[tex]v_y=g.t[/tex]
Where [tex]g=10 m/s^2[/tex]
To calculate the time the object takes to hit the ground, we use the same formula as for free-fall, since the time does not depend on the initial speed:
[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]
The marble rolls the edge of the table at a height of h=180 m, thus:
[tex]\displaystyle t=\sqrt{\frac{2*180}{10}}[/tex]
[tex]\displaystyle t=\sqrt{36}[/tex]
t = 6 sec
Choice: c. 6sec
Answer:
The answer is:
C) 6sec
Hope it helps:D