Answer: because there is no displacement or movement in the watchman's work. according to science when displacement or movement take place it is said to be work. hope this helps you.
Dropping a rock from 4 feet in the air is an example of what type of energy?
Answer:
The type of energy is potential energy
Latent heat of vaporization refers to which changes of state?
a. liquid to gas or gas to liquid
b. solid to gas or gas to solid
c. solid to liquid or gas to liquid
d. gas to liquid or liquid to solid
Answer:
I think it is A and yes I think it is A but I think it is A and I am not playing with you
Latent heat of vaporization refers to changes of state from liquid to gas or gas to liquid. Hence, option (a) is correct.
What is latent heat?In thermodynamics, latent heat is the heat or energy that is absorbed or released when a substance undergoes a phase change. A liquid to solid transition or a gas to liquid transition are both possible. Enthalpy, another heat attribute, is connected to latent heat.
When matter breaks down and transitions from a fluid to a gas at a constant temperature, this is known as latent heat of vaporization.
The heat of water vaporization is the highest known temperature. The heat of vaporization is defined as the amount of heat necessary to turn 1 g of a fluid into a fume without causing the fluid's temperature to change.
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The picture below was taken in the Maldives.
Which process most likely led the beach to form?
A.
Sediment being deposited as an ocean breeze slows down along the coast
B.
Palm trees breaking apart large pieces of granite and limestone
C.
Coral reefs in the ocean breaking down and being deposited ashore
D.
Rock on the beach being weathered by the water and falling apart
Answer:
it is c
Explanation:
a.p.e.x
i took the test
A 1200 kg car is traveling 21.1 m/s. It collides with a stationary car of mass 1500 kg, and the two vehicles lock together. What is the speed of the combined cars immediately after the collision?
A) 7.5 m/s
B) 16.5 m/s
C) 9.4 m/s
D) 11.8 m/s
Answer:
C) 9.4 m/s
Explanation:
[tex]m_1[/tex] = Mass of moving car = 1200 kg
[tex]u_1[/tex] = Initial velocity of moving car = 21.1 m/s
[tex]m_2[/tex] = Mass of stationary car = 1500 kg
[tex]u_2[/tex] = Initial velocity of stationary car = 0
v = Velocity of the combined cars
As the momentum in the system is conserved we have
[tex]m_1u_1+m_2u_2=(m_1+m_2)v\\\Rightarrow v=\dfrac{m_1u_1+m_2u_2}{m_1+m_2}\\\Rightarrow v=\dfrac{1200\times 21.1+1500\times0}{1200+1500}\\\Rightarrow v=9.378\approx 9.4\ \text{m/s}[/tex]
The velocity of the combined mass is 9.4 m/s.
An airplane is attempting to drop relief supplies to a village. If the plane is flying at an altitude of 500m and a speed of 110 m/s, how far ahead of the drop zone does he need to release the pallet?'
Answer:
1111 m
Explanation:
The following data were obtained from the question:
Height (h) = 500 m
Horizontal velocity (u) = 110 m/s
Horizontal distance (s) =?
Next we shall determine the time taken for the pallet to get to the target. This can be obtained as follow:
Height (h) = 500 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
500 = ½ × 9.8 × t²
500 = 4.9 × t²
Divide both side by 4.9
t² = 500/4.9
Take the square root of both side.
t = √(500/4.9)
t = 10.1 s
Finally, we shall determine how far the pallet needs to be dropped in order to get to the target. This can be obtained as follow:
Horizontal velocity (u) = 110 m/s
Time (t) = 10.1 s
Horizontal distance (s) =?
s = ut
s = 110 × 10.1
s = 1111 m
Thus, the pallet must be dropped at a distance of 1111 m from the plane in order to get the target.
A car increase velocity from 30 m/s to 60 m/s in 4 seconds
Answer:
Acceleration = 7.5
Explanation:
Vf = 60m/s
Vi = 30m/s
t = 4s
[tex]Acceleration = \frac{Velocity Change}{Time Change}\\ a = \frac{60m/s-30m/s}{4s}\\ a = \frac{30m/s}{4s}\\ a = 7.5m/s^2\\ or a = 8m/s^2[/tex]
Someone please help will mark as brainliest
During
storms, there is greater possibility of bigger trees breaking down than the small one
Answer:
umtkrumryu
Explanation:
Answer:
oh wow did not know that thanks! good things there no big trees where I am
Explanation:
Look at the diagram showing the different wavelengths in sunlight.
A diagram showing the human eye and visible light. Visible light is broken down by color with wavelength in nanometers. Red is 700, orange is 600, yellow is 580, green is 550, blue is 475, indigo is 450, violet is 400.
Which statement describes electromagnetic waves with wavelengths greater than 700 nanometers?
They take the form of heat.
They can cause skin cancer and sunburn.
They are some of the shortest waves.
They can be seen by human eyes as visible light.
What do the arrows at point 3 indicate?
Cool air is above water.
Warm air is above land.
Warm air is cooling quickly.
Cool air is warming quickly.
Answer:
D
Explanation:
Look at the diagram showing the different wavelengths in sunlight. A diagram showing the human eye and visible light. Visible light is broken down by color with wavelength in nanometers. Red is 700, orange is 600, yellow is 580, green is 550, blue is 475, indigo is 450, violet is 400.
the only answer that makes sense is D
Most asteroids _____.
A) revolve around Jupiter in the asteroid belt
B) take millions of years to orbit the sun
C) are found between Mars and Jupiter
D) are larger than 1,000 km in diameter
Answer:
C
Explanation:
The answer is C cause ... look at the file I added! Plz mark as brainlest! PASS THE TEST OR ASSIGNMNETT!
Will it be 200N? I am just making sure
Answer:I think it would be 0
Explanation:
Both are pushing with 100n therefore it will not move
A racecar is traveling at a speed of 80.0 m/s on a circular
racetrack of radius 450 m. What is the centripetal force on the
racecar if its mass is 500 kg?
The centripetal force on the race car if its mass is 500 kg is 7,111.1N
The formula for calculating the centripetal force of the car is expressed as
[tex]C=\frac{mv^2}{r}[/tex]
m is the mass of the car
v is the velocity of the car
r is the radius of the circular path
Given the following parameters
m = 500kg
v = 80.0m/s
r = 450m
Substitute the given parameters into the formula as shown
[tex]F_c=\frac{500 \times 80^2}{450}\\F_c=\frac{500\times 6400}{450}\\ F_c=\frac{3,200,000}{450}\\F_c= 7,111.1N[/tex]
Hence the centripetal force on the race car if its mass is 500 kg is 7,111.1N
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Pick the correct word to fill up the blank in below question: magnetic
field, atmospheric layers, gravitational pull, attraction force.
A rocket ship going from Earth to the moon must leave the___ ___ of Earth due to its mass.
Check it
The force which acts vertically downward and tends to opposite vertical upward motion of objects. Hence, the rocket ship must leave the gravitational pull of the earth due to its mass.
The magnetic field of the earth refers to the region of space around a magnet. Hence, the magnetic field of the earth has no effect on the rocket. The gravitational pull of the earth will tend to pull the rocket ship downwards until it escapes the gravitational field of the earth.Therefore, the rocket ship must leave the gravitational pull of the earth due to its mass.
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The rate at which energy is transferred is called
Answer:
The rate at which energy is transferred is called power and the amount of energy that is usefully transferred is called efficiency.
Answer:
your answer is power..
Density=2g/mL and volume=20mL what is mass
Answer:
40g
Explanation:
Mass = density x volume
= 2 x 20
= 40g
Answer:
m = V × ρ
= 20 milliliter × 2 gram/cubic meter
= 2.0E-5 cubic meter × 2 gram/cubic meter
= 4.0E-5 gram
= 4.0E-8 kilogram
Explanation:
The density of a material, typically denoted using the Greek symbol ρ, is defined as its mass per unit volume.
ρ =
m
V
where:
ρ is the density
m is the mass
V is the volume
The calculation of density is quite straightforward. However, it is important to pay special attention to the units used for density calculations. There are many different ways to express density, and not using or converting into the proper units will result in an incorrect value. It is useful to carefully write out whatever values are being worked with, including units, and perform dimensional analysis to ensure that the final result has units of mass volume. Note that density is also affected by pressure and temperature.
HELP ME PLEASE *50 points*
Use the diagram on the answer document to answer the following:
A. How much force is necessary to start the object moving?
B. How much force is necessary to keep this object moving?
C. If it starts at rest, will the object start to slide?
D. Depending on "C" either find the acceleration of the object or the additional force
necessary to move it.
660 newtons
830 newtons
no
additional force would be 350 newtons
Question 10 (2 points)
Which of the following types of waves has more energy than an X-ray?
Microwaves
Radio waves
Visible light
Gamma rays
Answer:
gamma rays
Explanation:
Answer:
D. Gamma Rays
Explanation:
Why does fulcrum placement matter for how a lever works?
Answer:
The mechanical advantage of using a lever is affected by the distance between the effort and the fulcrum and by the placement of the load. ... When the fulcrum is centered between the load and the lift, the amount of effort exerted to push down on the lever equals the amount of the load being lifted on the other end.
Tsunami waves are usually created by earthquakes that occur along ? _____ _____
Answer:
The correct answer is the sea
How did the hermit receive the king and how did he pass his time with the hermit
Answer:
Explanation:
As the king came near the hermit's hut, he saw the hermit digging the ground in front of his hut. He greeted the king and continued digging. ... (ii) The hermit saw simple people only, so the king put on simple clothes to visit him. (iii) The hermit was digging the ground in front of his hut when the king visited him.
This is for science someone please help me ASAP I’ll give you brainlest
the words are evaporation, sublimation, condensation, precipitation, runoff, transpiration, and infiltration
Answer: 7 - Transpiration, 6 - Infiltration, 5 - Runoff, 4 - Evaporation, 3 - Precipitation, 2 - Condensation, 1 - Sublimation,
Explanation:
What is a Block Grant used for?
Answer:
Block grants provide state and local governments funding to assist them in addressing broad purposes, such as community development, social services, public health, or law enforcement, and generally provide them more control over the use of the funds than categorical grants
Explanation:
Answer:
Block grants provide state and local governments funding to assist them in addressing broad purposes, such as community development, social services, public health, or law enforcement, and generally provide them more control over the use of the funds than categorical grants
Explanation:
Hope this helped, Have a Wonderful Day!!
which phase happens immediately after a third quarter moon
Answer:
waning gibbous
Explanation:
new Moon.
waxing crescent Moon.
first quarter Moon.
waxing gibbous Moon.
full Moon.
waning gibbous Moon.
last quarter Moon.
waning crescent Moon
These are the phases the moon goes through!
Answer:
Ur mom lol
Explanation:
Ur mom lol
Draw the Lewis dot Structure for the molecule C2H6
Answer:
This means that the Lewis dot structure for C2H6 must account for 14 valence electrons, either through bonding between atoms, or through lone pairs. So, the two C atoms are placed in the center of the molecule.
Can two or more than two quantities have same dimensions?
Answer: Yes. you can search this question on the website quora
Explanation:
An apple is dropped from rest. A. Calculate the vertical velocity of the apple at 2.5 seconds? B. Calculate how far the apple has fallen in 2.5 seconds?
Answer:
A. 24.5 m/s
B. 30.63 m
Explanation:
A. Determination of the vertical velocity of the apple.
Initial velocity (u) =?
Time (t) = 2.5 s
Acceleration due to gravity (g) = 9.8 m/s²
Vertical velocity (v) =?
v = u + gt
v = 0 + (9.8 × 2.5)
v = 0 + 24.5
v = 24.5 m/s
Thus, the vertical velocity of the apple is 24.5 m/s.
B. Determination of how far the apple has fallen.
Time (t) = 2.5 s
Acceleration due to gravity (g) = 9.8 m/s²
Height (h) =.?
h = ½gt²
h = ½ × 9.8 × 2.5²
h = 4.9 × 6.25
h = 30.63 m
Thus, the apple has fallen 30.63 m in 2.5 s.
what sort of fitness component would dance be
categorized under
Answer:
aerobic fitness
Explanation:
i just looked it up lol
Choose the best description for prokaryotic cell.
has a nucleus; found in multicellular organisms
has no nucleus; found in unicellular organisms
has no nucleus; found in multicellular organisms
has a nucleus; found in unicellular organisms
Answer:
has no nucleus; found in unicellular organisms
Explanation:
Prokaryotic cells are primitive cells found in lower organisms. Prokaryotic cells do not have a true cell.
A true nucleus lacks an envelope which contains the nuclear materials. Most of the organelles lacks membrane bound organelles. The true nucleus is lacking in prokaryotes.Eukaryotic cells have true nucleus.
Answer:
The answers B
Explanation:
If I fell asleep at 9:42 pm and woke up at 10:06 am. What was the total hours of sleep I got?
Answer:
11 hours and 24 minutes total of sleep. Nice.
Explanation:
Since its going from pm to am, We have to go past 12 to 1 and go to 9 hours am, then add 42 by 24 minutes to get to the 6 minutes past 10.
#teamtrees #WAP (Water And Plant)
Answer:
An hour and 36.
1:36
Explanation:
An empty glass does not dip in water in upside down position why
Answer:
An empty glass does not dip in water in upside down position because of air cavity present in it which doesnot let water enter the glass when kept it in upside down position