Answer:
Answer choice D!
Explanation:
When it comes to running during a hot day, the human body responds to extensive periods of heat by producing sweat. Sweat is necessary in order of cooling down the body, so that is why I figured it would be that answer. I hope this helped!
How are sound waves similar to light waves?
Answer:
Sound and light are similar in that both are forms of energy that travel in waves.
Explanation:
They both have properties of wavelength, freqency and amplitude. ... Sound can only travel through a medium (substance) while light can travel through empty space. Sound is a form of mechanical energy caused by vibrations of matter.
Answer:
When light moves from one medium (like air) to another medium (like water) it will change directions. This is a "wave-like" behavior and is called refraction. In this way light behaves like other waves such as sound waves. The speed of the light wave also changes when it moves from medium to medium.
Explanation:
4. To get to the sandwich shop, you left home and drove 6 miles south and then 10 miles west.
If a bird flew from your house to the sandwich shop in a straight line, how far do you think the
bird would fly? Use the simulation to check your reasoning.
. What direction should it fly from your house to get to the shop?
. Explain how you could use the simulation to answer these questions.
• Explain how you could use geometry equations to answer these questions.
If a bird flew from my house to the sandwich shop in a straight line, it would travel a distance of 10.44 miles.
The direction that it should fly from my house to get to the shop is at an angle 73.30°.
Pythagorean theorem-
The position vector are
OA = -6j AB = -10iBC=3j
where
O is the position of the house
C is the position of the shop.
Now drawing a perpendicular from C to OA at P we have,
Thus we have,
PC = 10i
PA = 3j
Thus,
OP = OA - PA = -6j + 3j = -3j
OC is the resultant of CP and OP
a) Thus the magnitude of OC
| OC | = √CP^2 + OP^2
= √ (10^2 +3^2) =10.44
b) The angle made by OC with OP
tan θ = OP/CP = 10/3
θ = 73.30°
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a string along which waves can travel is 2.70 m long and has a mass of 260.0 g. the tension in the string is 36.0 n. what must be the frequency of traveling waves of amplitude 7.70 mm for the average power to be 58.0 w?
By power transmitted by string, the frequency must be 163.31 Hz.
We need to know about power transmitted to solve this problem. The power transmitted by a wave on string can be determined by this equation
P = 1/2 . μ . ω² . A² . v
where P is the power, μ is mass per unit length of string, ω is angular speed, A is amplitude and v is wave propagation speed.
the wave propagation can be determined as
v = √(F.l/m)
where F is the string tension, l is length and m is the mass.
From the question above, we know that:
l = 2.7 m
m = 260 g = 0.26 kg
F = 36 N
A = 7.7 mm = 0.0077 m
P = 58 W
Find the mass per unit length
μ = m / l
μ = 0.26 / 2.7
μ = 0.096 kg / m
Find the wave propagation speed
v = √(F.l/m)
v = √(36. 2.7 /0.26)
v = √(373.85)
v = 19.34 m/s
Find the angular speed
P = 1/2 . μ . ω² . A² . v
58 = 1/2 . 0.096 . ω² . 0.0077² . 19.34
ω² = 1053777.29
ω = √1053777.29
ω = 1026.54 rad/s
Find the frequency
ω = 2πf
1026.54 = 2 . 3.14 . f
f = 163.31 Hz
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Justin is a triathlete it takes him 28 minutes to finish the 1500 meter swim. 1.75 hours for the 40 milometer biking portion and 70 minutes for the 10 kilometer run. what is Justin's average speed for the triathlon?
Justin's average speed for the triathlon is 15.23km/h
Average speed is the total distance covered in total time taken.
(given) 28 minutes to finish the 1500 meter swim
1.75 hours for the 40 kilometer biking portion
70 minutes for the 10 kilometer run
total distance covered = 1500m + 40 km+ 10 km
= 51500m = 51.500km
(1km = 1000m)
total time taken = 28mint + 1.75hr + 70 mint
= 203mint
time in hours = 203/60 hr
(1hour = 60 mint)
average speed = total distance covered / time taken
= 51.5 x 203/60
= 15.23km/h
Justin's average speed for the triathlon is 15.23km/h
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part 1 of 2
A neutron in a reactor makes an elastic
head-on collision with the nucleus of an atom
initially at rest.
Assume: The mass of the atomic nucleus is
about 11.1 the mass of the neutron.
What fraction of the neutron's kinetic en-
ergy is transferred to the atomic nucleus?
part 2 of 2
In the initial kinetic energy of the neutron
is 1.77 x 10^-13 J. find its final kinetic energy.
Answer in units of J.
Answer:
for part 1 the answer is 0.303
Explanation:
If it took 3 hours to clean 6 houses, how many houses could be cleaned in 12 hours?
Answer:
24
Explanation:
If it took 3 hours to clean 6 houses than you can figure that is 2 houses per hours. so if there are 12 hours and 2 houses an hour, you multiply 12x2 and get 24. Another way to do it is to use proportions (aka two fractions that equal eachother):
3 hours 12 hours
---------------- = ---------------
6 houses number of houses
To calculate this, we can think about how we go from 3 to 12. Well, 3x4 is 12, so we got to 12 by doing multiplying by 4. So we can multiply 6 by 4 and you get 24.
Hope it helps! have a great day :)
pls solve this numerical.
Answer:
You should write the vectors in their proper sequence: i , j, k
If the vectors are perpendicular their dot product must be zero:
1) A dot B is obviously zero since A and B have no common terms in i , j , k
2) looks like A = 2 i - 4 j + 3 k and B = i + 2 j + 2 k
A dot B = (2 * 1) + (-4 * 2) + (3 * 2) = 0
Note that the dot product produces a scalar with no direction (vector components)
Only i dot i, j dot j, and k dot k have components i dot j = zero, etc.
What is an effect of La Nina?
A.) Alaskan fish populations increase
B.) Flordia
C.) Fish populations off the coast of Peru decrease
D.) South American becomes dire than normal
Answer: D
Answer:
D.) South American becomes dire than normal
Explanation:
La Niña effect can be regarded as an effect that has impacts on the global climate, this effect bring about disruption in normal weather patterns, as a result of this intense storms as well as drought is experienced. The effect could be intense by worsening of above temperature. It bring an increases the probability of having a rainfall below normal. As a result of this
South American becomes dire than normal.
The alpha decay of radon-198
Anna is drinking a glass of water in her kitchen. The water is too warm for Anna so she decides to make it colder by adding ice. Which statement describes why the ice cubes will melt?
A. Liquid water is reacting with solid water to absorb energy.
B. Water is evaporating from the surface of the water.
C. Slow-moving molecules move out of the ice.
D. Heat from the water moves into the ice.
Answer:
D: Heat from the water moves into the ice
Answer:
D
Explanation:
Because the molecules of a solid is going to separate form each other because of the hotness of the water and then that’s how the ice cubes would melt
Which of the following is the best way to express the dimensions of a laboratory bench (large desk)? *
1.04 m * 400 cm
1.04 m * 4.00 m
104 cm * 4.00 m
1040 mm * 4000 mm
To determine the large dimension, always big dimension should be preferred. Hence, option B is correct.
What is a dimension?An area, region, or space's length or width in one direction is referred to as a dimension in mathematics. It merely involves taking an object's length, width, and height into account.
Dimension can be expressed in any one of them, such as Length, Breadth, Width, Height, or Depth.
According to the question, the best possible way to express the dimension in 1.04 m* 4.00 m is because both the dimensions are in the same unit, so it will be easy to calculate the dimension and another thing is that all other dimensions in the option are very small, so it will take more time to measure from them because the desk is large.
Hence, measuring with 1.04 m * 4.00 m will be the more convenient and the best way as well.
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A car moves 50km in the first 30 minutes and 50km in the second 30 minutes and continues in this way which motion is this -------------------------
Answer:
Uniform rectilinear movement (m. r. u.)
Explanation:
It is a continuous movement without acceleration, that is, it moves at a constant speed. The speed does not change over time, for this reason, there is no change in acceleration.
Vf = final velocity = 50/30 [km/s] = 1.67 [km/s]
Vo = initial velocity = 50/30 [km/s] = 1.67 [km/s]
A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What is the change in momentum of the car?
Answer:
The change in momentum = -20000 kg m/s.
Explanation:
Mass m = 1000 kg
speed v₁ = 20 m/s
speed v₂ = 0 m/s
We know that,
The change in momentum
ΔP = m (Δv)
ΔP = m (v₂ - v₁)
= 1000 (0 - 20)
= 1000 (-20)
= -20000 kg m/s
Thus, the change in momentum = -20000 kg m/s.
Note: negative sign indicates that the velocity is reducing when it hits the barrier.
During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 4.06 s, how high above the point where it hits the bat does it rise? Assume when it hits the ground it hits at exactly the level of the bat. The acceleration of gravity is 9.8 m/s 2 .
The height of the point where it hits the ball is 20.171 m.
When a batter hits a ball high in a baseball game,
Time till the ball remains in the air, t = 4.06 seconds.
The acceleration of gravity, g = 9.8 m/s².
The vertex value of time is half of the time, the ball remains in the air
i.e. [tex]\frac{4.06}{2}[/tex] = 2.03 s
Final velocity (v) at the maximum height will be 0
So, According to the First Equation of Motion:
v - u = gt
u = - gt
u = -9.8 × 2.03
u = -19.894 m/s
Now, by using the Second Equation of Motion:
v² - u² = 2gh
Since v = 0
[tex]h = \frac{u^{2} }{2g}[/tex]
h = [tex]\frac{19.894^{2} }{2 * 9.81}[/tex]
h = 20.171 m
The ball will rise 20.171 meter high.
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Water
Wood
Neon gas
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement
A)
wood, water, neon gas
B)
wood, neon gas, water
water, wood, neon gas
D
water, neon gas, wood
Answer:
I think the correct answer from the choices listed above is option A. The correct arrangement of the substances according to the most to the least ordered particle arrangement should be wood, water and neon gas. Wood should be the first since it is solid which has the most ordered structure as compared to the liquid and a gas. The neon gas is the last since as a gas it has the least ordered structure.
Answer:
A) wood, water, neon gas
Explanation:
wood, water, neon gas.
The particles of solids have an arrangement that is highly ordered and regular. Liquids have an arrangement that is less ordered, and the particle arrangement in gases is the least ordered and regular of the three states of matter.
tell me if im wrong .... hope this helps :)
Can someone please answer this exactly correct and please no links
Answer:
jaja I don't remember it's been 6 years ago u don't remember nothing of that
how many laws are named after sir issac newton
Answer:
Three Laws
Newton's Three Laws of Motion. Sir Isaac Newton: The Universal Law of Gravitation. Sir Isaac Newton and the Unification of Physics & Astronomy.
Explanation:
Because most particles fired at metal foil passed straight through, rutherford concluded that.
Because most particles fired at metal foil passed straight through, Rutherford concluded that only a small area of an atom is positively charged called the nucleus.
Rutherford's atomic model states that the atom is a small-sized particle that is composed of other fundamental objects i.e. electrons, protons, and neutrons.
In the core of an atom, there is an extremely dense, tiny-sized object called the nucleus which is positively charged.
Moreover, the nucleus is the central point containing all the mass of an atom around which negatively charged particles revolve in circular paths called electrons.
To put it simply, this model suggests that when electrons interacted with atoms in gold metal foil, only a few changed their path after colliding with the massive dense nucleus.
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explain how a fire alarm work
Answer:
Smoke alarms detect fires by sensing small particles in the air using a couple of different kinds of technologies. Once they detect those particles above a certain threshold, they signal the alarm to sound so that you and your family can get to safety and call 911. Smoke alarms save lives.
find the slope of the line that passes through the following pairs of points. (10, 8) (9, 13)
Using the rule-of-1 approach, what is the proportional change in centripetal acceleration, ac, for an object in a circular path when the tangential velocity is doubled? 2ac (doubles) 2 A sub c, (doubles) ac2 (halves) the fraction with numerator A sub c and denominator 2, (halves) ac4 (quarters) the fraction with numerator A sub c and denominator 4, (quarters) 4ac (quadruples)
Answer:
4ac (quadruples)
Explanation:
The general formula for centripetal acceleration is given as follows:
[tex]a_{c} = \frac{v^2}{r}\\\\[/tex] -------------- equation (1)
where,
ac = centripetal acceleration
v = tangential speed
r = radius of circular path
Now, if we double tangential speed, v' = 2v, then the acceleration will become:
[tex]a_{c}' = \frac{(2v)^2}{r}\\\\a_{c}' = \frac{4v^2}{r}[/tex]
using equation (1):
[tex]a_{c}' = 4a_{c}[/tex]
therefore, the correct answer is:
4ac (quadruples)
Suppose the acceleration of an elevator is 1/2 g upward, then what is the reading on the scale in the elevator.
a. 1/2 mg
b. 2 mg
c. 3/2 mg
d. m
Answer:
c. 3/2 mg
Explanation:
Given that the acceleration of an elevator is 1/2 g upward.
The reading on the scale of the elevator is the net external force acting on the elevator.
Let the force F acting on the elevator as shown,
By using Newton's 2nd law, [tex]F_{net}=ma[/tex]
where, [tex]F_{net}[/tex] is the net force acting on the elevator.
m is the mass of the elevator,
a is the acceleration of the elevator, as given a=1/2 g upward.
So, [tex]F_{net}=m\times \frac 1 2 g[/tex]
[tex]F-mg=m\times \frac 1 2 g \\\\F=mg+ \frac 1 2 mg \\\\F= \frac 3 2 mg.[/tex]
So, the reading on the scale in the elevator is [tex]\frac 3 2 mg[/tex].
Hence, option (c) is correct.
can you please answer theese two qeastion
The first one is C!
I hope the answer helped! please mark brainliest and vote 5 stars! >:)
does anyone know any sites that you can use for physics for like homework
Answer:
the app your on now is great and can ask anything
interior crocodile alligator i drive a chevrolet movie theater
Answer:
nah bro tesla
Explanation:
In order to move a bag of dog food across a 10 meter room, you apply 20 newton’s of force. How much work was done?
A. 2 joules
B. 10 joules
C. 30 joules
D. 200 joules
The answer is 200 joules.
Answer:
Its answer is 200joule.
Explanation:
Hope it's helpful for you
1 point
How fast does a 400 kg car have to move to have a momentum of 800
kgm/s?
Answer:
2m/s
Explanation:
Given parameters:
Mass of car = 400kg
Momentum = 800kgm/s
Unknown:
Speed of the car = ?
Solution:
The momentum of a car is amount of motion it posses;
momentum = mass x velocity
Insert the parameters and solve;
800 = 400 x v
v = 2m/s
For an observer who stays in one spot when the source of a sound is moving,
the sound wave's:
OA. amplitude increases.
B. amplitude decreases.
OC. frequency changes.
OD. speed increases.
Answer:
Explanation:
The correct option of the given question will be option © that is frequency changes.
According to the Doppler Effect, when source is moving towards the observer then the frequency increases and when the source is moving away from the observer then the frequency decreases, but the magnitude of the amplitude in both the cases will remain same. Whereas the speed of sound waves will remain constant as it was earlier. According to this effect, when there is a relative motion between the source and the observer then there will be the change in the frequency.
So, the correct answer will be that the frequency changes.
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Um avião, após deslocar-se 120 km para nordeste (NE), desloca-se 160 km para sudeste (SE). Sendo um quarto de hora o tempo total dessa viagem, o módulo da velocidade vetorial média do avião, nesse tempo, foi de A) 320 km/h. B) 480 km/h. C) 540 km/h. D) 640 km/h. E) 800 km/h.
Answer:
E) 800 km/h
Explanation:
The computation of the average vector velocity module of the plane, at that time is shown below:
The displacement vector is
d^2 = d1^2 + d2^2
where,
d1 = northeast displacement
d2 = southeast displacement
Now
d^2 = (120)^2 + (160)^2
= 14400 + 2560
= 40000
= √40000
d = 200 km
Now the average velocity is
V = ΔS ÷ Δt
= 200 ÷ 1 ÷ 4
= 200 × 4
= 800 km/h
if it is summer solstice in the Northern Hemisphere, what is happening in the Southern Hemisphere
Answer:
Winter Solstice