Answers
In a 24-hour period, 6,670.08 Kcal of thermal energy passes through the window.
What does one side of a refrigerator/cold room look like?A 168 mm thick layer of cork is sandwiched between the exterior and interior walls of a cold room that is 6 metres long and 3.7 metres high. The inner wood wall is 35 mm thick, and the inside face temperature of the inner wood wall is -3°C. The exterior wood wall is 30 mm thick and has a 20°C outside face temperature.
You may determine the thermal energy flow through the window using the following formula:
Q = kAΔTt/d
When we substitute the specified values, we obtain:
Q = (1.89 x 10^-4 Kcal/m-s-°C) x (1.60 m^2) x ((6.8 - (-50)) °C) x (24 hours x 3600 seconds/hour) / (0.004 m)
Q = 6,670.08 Kcal
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Related Questions
If you start at a speed of 4m/s and slow down to 2m/s in 4s what is your
acceleration?
Answers
Answer:
penis
Explanation:
Which layer of the atmosphere is most likely to protect life on Earth from ultraviolet radiation
Answers
Answer:
ozone layer
Explanation:
The ozone layer forms a thin shield in the upper atmosphere protecting life on earth from UV rays. Ozone is a naturally occurring gas that is found in two layers of the atmosphere
Which ray diagram demonstrates the phenomenon of absorption?
An illustration with a vector pointed right going through an opening in a boundary and splitting into 3 vectors. One up and to the right, one straight and one down to the right.
An illustration with a vector pointed right going through an opening in a boundary and turning into a transverse wave on the other side.
An illustration with a vector striking a boundary at an angle and a second vector coming off the boundary at the exact same angle.
Answers
Answer:
B
Explanation:
on edge
The illustration with a vector pointed right going through an opening in a boundary and turning into a transverse wave on the other side demonstrates the phenomenon of absorption, so, option B is correct.
What is absorption?Absorption, in wave motion, is the process by which a wave's energy is transferred to matter when the wave travels through it. The energy of an electromagnetic, acoustic, or other wave is related to the square of its amplitude, which is the maximum displacement or movement of a point on the wave.
The amplitude of a wave continuously diminishes as it travels through a substance. The medium is described as being transparent to a specific type of radiation if just a tiny portion of the energy is absorbed, whereas it is described as opaque if all the energy is lost.
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a car travelling at 18 km/hr accelerates uniformly at 2m per seconds square. calculate its velocity in km/hr in 5 seconds
Answers
1 km = 1000 m
1 hr = 3600 s
So, 18 km/hr = (18 * 1000) / (3600) m/s = 5 m/s
And 2 m/s^2 = 2 m/s^2
Now, we can use the formula for final velocity (v) when an object starts with an initial velocity (u) and accelerates at a constant rate (a) for a given time (t):
v = u + at
Plugging in the values, we get:
v = 5 + (2 * 5) m/s v = 15 m/s
To convert this back to km/hr, we use the inverse conversions: v = (15 * 3600) / (1000) km/hr v = 54 km/hr
Therefore, the car’s velocity in km/hr after 5 seconds is 54 km/hr.
01:16:1
A weather forecaster describes the condition over Florida as having thunderstorms, rotating winds at 60 miles per hour and
heavy rain. Which natural hazard is happening?
O
o
O
O
a thunderstorm
a hurricane
a tropical cyclone
a flood
Answers
Answer:
Hurricane
Explanation:
Hurricane can be described as a huge storm that came with a strong and harsh wind. This wind tends to move in a circular motion over warm ocean water that are found in tropical regions.
Hurricane comes with strong winds that move at the rate of over 60 miles per hour, this results in the formation of a heavy rainfall. Hurricanes are also referred to as cyclones depending on where they take place. In places like Florida, which is surrounded by the Atlantic ocean the type of natural hazard that occurs there is known is hurricane.
Hurricane is formed when warm air that emanates from the ocean begins to rise up to a very high temperature, When it comes across a much more cooler air the steam condenses and results in a heavy downpour.
Answer:
Hurricanes
Explanation:
Hurricanes are a form of natural hazard that usually come with very strong rotating winds, thunderstorms and heavy rainfall. In meteorology, they are said to have a low pressure center and a close low level circulation
Megan walks 100 m east and then travels 70 m north followed by 140 m
east. What is the total distance she travels? Show/explain how you
calculate. *
Answers
Answer:
I think it's just 100+70+140
To see how two traveling waves of the same frequency create a standing wave. Consider a traveling wave described by the formula:
y1(x,t)=Asin(kx−ωt).
This function might represent the lateral displacement of a string, a local electric field, the position of the surface of a body of water, or any of a number of other physical manifestations of waves.
Required:
Find ye(x) and yt(t). Keep in mind that yt(t) should be a trigonometric function of unit amplitude.
Answers
Answer:
y_e = 2A sin kx
y_t = cos wt
Explanation:
A standing wave is produced by the reflection of a traveling wave in an obstacle, let's write the initial traveling wave
y₁ = A sin (kx -wt)
let's write the reflected wave
y₂ = A sin (kx + wt)
we find the sum of these two waves
y = y₁ + y₂
y = A sin (kx -wt) + A sin (kx + wt)
let's develop the double angles
y = A [sin kx cos wt - cos kx sin wt + sin kx cos wt + cos kx sin wt]
y = A [2 sin kx cox wt]
we can write this resulting wave
y_e = 2A sin kx
y_t = cos wt
These entities are described by a modified form of the Sakuma-Hattori equation which contains a term proportional to wavelength to the negative fifth power. In these things, peak wavelength is inversely proportional to temperature according to Wien’s displacement law. Under certain assumptions, these things were predicted to have (*) infinite energy, which led to the ultraviolet catastrophe. These objects have power proportional to the fourth power of temperature according to the Stefan-Boltzmann law. For 10 points, name these things which emit more energy than any other object with the same temperature and absorb all incoming electromagnetic radiation.
Answers
These things are black bodies. Black bodies are objects that absorb all incoming electromagnetic radiation and emit more energy than any other object with the same temperature.
Black bodies are described by the Sakuma-Hattori equation, which includes a term proportional to the wavelength to the negative fifth power. The peak wavelength of black body radiation is inversely proportional to temperature according to Wien's displacement law. Under certain assumptions, black bodies were initially predicted to have infinite energy, which led to the ultraviolet catastrophe. According to the Stefan-Boltzmann law, black bodies have power proportional to the fourth power of temperature.
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A car drove 200 km east on an interstate highway, then was finally able to make an
exit and drove for another 70 km to the north before reaching their destination.
What was the direction of car's resultant displacement?
Answers
Answer:
70.66°Explanation:
To find the direction of the displacement vector, we have to solve for the ratio of both displacements, and furthermore the inverse tangent of the ratio.
Given data
200km east represents the x axis
70 km north represents y axis
the direction of the resultant is given as
∅= tan-1x/y
∅=tan-1 200/70
∅= tan-120/7
∅= tan-12.85
∅= 70.66°
hence the direction of the resultant is 70.66°
Which occupies more volume: 3m^3, or 100 ft^3?
Answers
Answer:
3 m³ will occupy more volume.
Explanation:
We need to tell which occupies more volume : 3m³ or 100 ft³.
To compare, we first make the units same.
We know that,
1 m = 3.28 feet
1 m³ = 35.31 foot³
3 m³ = 105.94 foot³
Now, we can compare 105.94 foot³ and 100 ft³. It can be clear that 3 m³ will occupies more volume.
what is the acceleration of an object that has a mass of 10kg and is pushed with a force of 50 N. just answer this question with the number no unit
Answers
Answer:
a = 5 [m/s²]
Explanation:
We know from Newton's second law that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = total force = 50 [N]
m = mass = 10 [kg]
a = acceleration [m/s²]
Now replacing:
\(a = \frac{F}{m} \\a=50/10\\a = 5 [m/s^{2} ]\)
A stunt car traveling at 20 m/s flies horizontally off a cliff and lands 39.2 m from the base of the cliff. How tall is the cliff?
Answers
Answer:
18.82 m
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 20 m/s
Horizontal distance (s) = 39.2 m
Height (h) of the cliff =?
Next, we shall determine the time taken for the car to get to the ground. This can be obtained as follow:
Initial velocity (u) = 20 m/s
Horizontal distance (s) = 39.2 m
Time (t) taken to reach the ground =?
s = ut
39.2 = 20 × t
Divide both side by 20
t = 39.2 / 20
t = 1.96 s
Finally, we shall determine the height of the cliff as follow:
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) taken to reach the ground = 1.96 s
Height (h) of the cliff =?
h = ½gt²
h = ½ × 9.8 × 1.96²
h = 4.9 × 3.8416
h = 18.82 m
Therefore, the cliff is 18.82 m high
identify two factors that determine the amount of electricity that can be generated by an indi-vidual hydroelectric power plant. (2 points)
Answers
Two factors that determine the amount of electricity that can be generated by an individual hydroelectric power plants - It depends on the vertical distance through which the water falls and the flow rate, or amount of water that flows past a certain point per unit time, The greater the distance that the water falls, the more potential energy it had and the more electricity is generated the more kinetic energy it has and the more .
Impoundment, diversion, and pumped storage facilities are the three different types of hydroelectric facilities. Hydropower plants vary in their utilisation of dams. Despite the fact that not all dams were constructed for hydropower, they have been successful in supplying vast amounts of renewable energy to the grid. As of 2020, fewer than 2,300 of the more than 90,000 dams in the United States were producing electricity. The other dams are utilised for water supply, irrigation, flood control, stock/farm ponds, and recreation. Hydropower facilities come in a variety of sizes, from modest initiatives providing electricity for a single house or community to massive undertakings.
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what is the main cause of the seasons
Answers
how is sunlight different from light produced by a light bulb or by a fluorescent light bulb
Answers
A motorcycle stoop is at a traffic light, when the light turns green, the motorcycle accelerates to a speed of 78 km/h over a distance of 50 m. What is the average acceleration of the motorcycle over this distance?
Answers
The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².
To calculate the average acceleration of the motorcycle, we can use the formula:
Average acceleration = (final velocity - initial velocity) / time
First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.
Converting the final velocity:
Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s
Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:
Average acceleration = (21.67 m/s - 0 m/s) / time
To find the time taken to reach this velocity, we need to use the formula for average speed:
Average speed = total distance/time
Rearranging the formula:
time = total distance / average speed
Plugging in the values:
time = 50 m / 21.67 m/s ≈ 2.31 seconds
Now we can calculate the average acceleration:
Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²
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what's force and laws of motion
Answers
A force is a push or pull upon an object resulting from the object's interaction with another object.
We have 3 laws of motion or Newton's laws
1. The law of inertia or first law postulates that a body will remain at rest or in straight motion with a constant speed unless an external force is applied.
2. Newton's second law or fundamental law, postulates that the net force that is applied on a body is proportional to the acceleration it acquires on its path.
The formula is F=ma
where F is the force, m is the mass and a is the acceleration
3. Newton's third law postulate says that every action generates an equal reaction but in the opposite direction.
c. Describe how to use right-hand rules to relate the directions of magnetic fields, currents, moving charges, and forces. (1 point)
Answers
Answer:
Physicists use a hand mnemonic known as the right-hand rule to help remember the direction of magnetic forces. To form the mnemonic, first make an L-shape with the thumb and first two fingers of your right hand. Then, point your middle finger perpendicular to your thumb and index finger.
Answer:
If you point your pointer finger in the direction the positive charge is moving, and then your middle finger in the direction of the magnetic field, your thumb points in the direction of the magnetic force pushing on the moving charge.
Explanation:
Got it right
A man gets mad at his messed up computer and tosses it out of a 50 m high window. What is the velocity of the computer as it hits the ground?
Answers
A motorcycle, travelling cast, starts from rest, moves in a straight line with a constant acceleration and covers a distance of 64 m in 4 s.Calculate a) Its acceleration b) Its final velocity c) At what time the motorcycle had covered half the total distance d) What distance the motorcycle had covered in half the total time.
Answers
The motorcycle had covered a distance of 16 meters in half the total time.
a) To calculate the acceleration, we can use the formula:
a = (v - u) / t
where a is the acceleration, v is the final velocity, u is the initial velocity (which is 0 since the motorcycle starts from rest), and t is the time.
Given:
u = 0 m/s (initial velocity)
v = ? (final velocity)
t = 4 s (time)
s = 64 m (distance)
Using the equation of motion:
s = ut + 1/2at^2
We can rearrange the equation to solve for acceleration:
a = 2s / t^2
a = 2(64) / (4)^2
a = 128 / 16
a = 8 m/s^2
Therefore, the acceleration of the motorcycle is 8 m/s^2.
b) To find the final velocity, we can use the formula:
v = u + at
v = 0 + (8)(4)
v = 32 m/s
Therefore, the final velocity of the motorcycle is 32 m/s.
c) To determine the time at which the motorcycle had covered half the total distance, we divide the total distance by 2 and use the formula:
s = ut + 1/2at^2
32 = 0 + 1/2(8)t^2
16 = 4t^2
t^2 = 4
t = 2 s
Therefore, the motorcycle had covered half the total distance at 2 seconds.
d) To calculate the distance covered in half the total time, we use the formula:
s = ut + 1/2at^2
s = 0 + 1/2(8)(2)^2
s = 0 + 1/2(8)(4)
s = 0 + 16
s = 16 m
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You’re at the ice-skating rink with a 5kg bowling ball. The two of you (you and the bowling ball) stand motionless in the middle of the rink so that your combined momentum is zero. You then throw the bowling ball and begin to slide backward. If your momentum is then 12 kg • m/s backward, what is speed does the bowling ball have?
Answers
The speed of the bowling ball is 2.4 m/s forward.
What is the speed of the bowling ball?
The speed of the bowling ball is calculated by applying the principle of conservation of linear momentum as shown below.
P1 = -P2
where;
P1 is your momentumP2 is the momentum of the bowling ballP1 = -mv
-P1 = mv
where;
m is the mass of the bowling ballv is the speed of the bowling ballThe speed of the bowling ball is calculated as;
v = ( - 12 kgm/s ) / ( 5 kg )
v = -2.4 m/s
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2.A man drags a 100 kg crate up the ramp of a truck. The ramp is inclined at 20° and the
man pulls at an angle of 30° above the ramp. The coefficient of friction between the crate
and the ramp is 0.2.
a) What is the normal force on the crate in terms of the applied force, F? (Hint: The
normal force does not just balance the perpendicular component of gravity)
b) What is the minimum force the man would have to apply to pull the crate up the ramp
(Hint: minimum force would be the force required to pull the crate up the ramp at
constant velocity)
Answers
a ) The normal force on the crate in terms of the F = 921.2 - 0.5 F N
b ) The minimum force the man would have to apply to pull the crate up the ramp = 533.44 N
W = m g
m = 100 kg
g = 9.8 m / s²
W = 100 * 9.8
W = 980 N
Resolving the force of gravity into its horizontal and vertical components,
Wx = W sin θ
Wx = 980 * sin 20°
Wx = 333.2 N
Wy = W cos θ
Wy = 980 * cos 20°
Wy = 921.2 N
Resolving F into its vertical and horizontal components,
Fx = F cos θ
Fx = F cos 30°
Fx = 0.87 F N
Fy = F sin θ
Fy = F sin 30°
Fy = 0.5 F N
Since there is no acceleration in y-direction,
N - Wy + Fy = 0
N = 921.2 - 0.5 F
Ff = μ N
If the crate is being pulled with the minimum force, velocity would be constant. So acceleration will be zero.
∑ \(F_{x}\) = 0
Fx - Ff - Wx = 0
0.87 F - 0.2 ( 921.2 - 0.5 F ) - 333.2 = 0
0.87 F - 184.24 + 0.1 F - 333.2 = 0
0.97 F = 517.44
F = 533.44 N
Therefore,
a ) The normal force on the crate in terms of the F = 921.2 - 0.5 F N
b ) The minimum force the man would have to apply to pull the crate up the ramp = 533.44 N
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Newton's law of restitution
Answers
Answer:
Explanation:
Newton's law of restitution states that when two bodies collide, the speed with which they move after the collision actually depends on the material from which they are made. The Coefficient of Restitution (e) tells us about the bounciness, or elasticity, of the collision.
Nowton's third law refers to 'action reaction forces*. These forces are
always:
Answers
equal in magnitude but opposite in direction
Mars had an orbital period of 1.88 years. In two or more complete sentences,explain how to calculate the average distance from mars to the sun, then calculate it
Answers
The average distance from mars to the sun if Mars had an orbital period of 1.88 years is 2.27 * \(10^{8}\) km
P² = a³
P = Orbital period
a = Average distance
P = 1.88 years
a³ = 1.88²
a³ = 3.53
a = 1.52 AU
a = 1.52 * 1.496 * \(10^{8}\) km
a = 2.27 * \(10^{8}\) km
The formula used to solve the given problem is derived from Kepler's third law of planetary motion. AU is the abbreviated from of Astronomical unit. 1 AU = 1.496 * \(10^{8}\) km
Therefore, the average distance from mars to the sun is 2.27 * \(10^{8}\) km
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In the district soccer championship finals, Elizabeth kicks a 0.78 kg soccer ball with a
force of 33.0 N. How much does she accelerate the soccer ball from rest in the
process?
Answers
Answer:
42.36 m/ s^2
Explanation:
First implement the formula f=m*a. f=33Nmass=0.78kg.where acceleration comes 42.36 m/ s^ 2
Elizabeth accelerates the soccer ball with an acceleration of 42.3 m/s² from rest in the process.
What is acceleration?Acceleration of an object can be defined as the rate of change of velocity of an object with respect to time. The acceleration of an object is a vector quantity with both magnitude and direction. Acceleration is also defined as the second derivative of position w.r.t. time and the first derivative of velocity of an object w.r.t. time.
According to Newton's second law of motion, the force is equal to the product of the mass and acceleration of an object.
F = ma
And, a = F/m
Therefore, the acceleration of a body is inversely proportional to the mass of the body.
Given, the force with which, Elizabeth kicks a soccer ball
F = 33.0 N
The mass of the soccer ball = 0.78 Kg
The acceleration of the soccer ball = 33/0.78 = 42.3 m/s²
Therefore, the acceleration of the soccer ball when it gets kicked is 42.3m/s².
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A boy kicked off a cliff and lands 151m away 45s later. What was the initial velocity? How tall is the cliff?
Answers
That’s the height of the cliff
The original sideways velocity = 151/45 = 3.35 m/s
If an object is placed between a convex lens and its focal point, which type of image will be produced?
Answers
A 5 cm spring is suspended with a mass of 1 g attached to it which extends the spring by 3.2 cm. The same spring is placed on a frictionless flat surface and charged beads are attached to each end of the spring. With the charged beads attached to the spring, the spring's extension is 0.01 m. What are the charges, in micro-Coulombs, of the beads?
Answers
First, we need to find the spring constant
Force of gravity = force of tension from spring
mg = kx
(1x10^-3)(9.8) = k (3.2x10^-2)
k = .30625
Now we can look at the other situation
Since the spring was moved 0.01 meters, we can find the force
F = kx = (.01)(.30625) = .0030625 N
Now we can set the electric force equal to the force of the beads
kq^2/r^2 = .0030625 N
q = 292 microCoulombs
Why won’t anyone help me please anybody help me I really need help .
Answers
Answer:
1➡️ this is the method of decomposition
2➡️ H2 and O2
3➡️ b
sorry if I am wrong