Answer:
It cannot reach us by conduction or convection as there is no medium such as air in most part of the space between the earth and the sun. From the sun the heat comes to us by another process known as radiation. The transfer of heat by radiation does not require any medium.
Answer:
Heat can't be transferred from sun to earth by conduction, because air is a bad conductor of heat. Convection is the transfer of heat in gases & liquids. Convection occurs when a heated fluid moves away from the source of heat and comes in contact with other substances, transferring some of their energy.
What are the positive and negative effects of tapping or harnessing geothermal energy? Cite ways to address the different environmental concerns related to both sources of energy
Answer:
It is a renewable resource as it renewably heats up water to a high temperature. Geothermal energy is more environmentally friendly than conventional fuel sources such as coal and other fossil fuels. In addition, the carbon footprint of a geothermal power plant is low.
Disadvantages: If dug deep underground, it can cause earthquakes. generates waste, reservoirs require proper management, it's location-specific, has high initial cost
2. A student slides a 0.75 kg textbook across a table, and it comes to rest after
traveling 1.2 m. Given that the coefficient of kinetic friction between the
book and the table is 0.34, use the work-kinetic energy theorem to find
the book's initial speed.
The book's initial speed = 2.83 m/s
The mass of the textbook, m = 0.75 kg
The final speed of the textbook, v = 0 m/s (Since it comes to rest)
The distance covered by the book, d = 1.2 m
Coefficient of kinetic friction, [tex]\mu = 0.34[/tex]
The frictional force between the table and the book is calculated as:
[tex]f_k=-\mu mg\\\\ f_k=-0.34 \times 0.75 \times 9.8\\\\f_k=-2.499N[/tex]
The workdone by the textbook is calculated as:
[tex]W = Fd\\\\W=2.499(1.2)\\\\W=2.9988J[/tex]
According to the work-kinetic energy theorem:
Workdone by the book = Change in Kinetic energy
[tex]W = 0.5m(v^2-u^2)\\\\-2.9988=0.5 \times 0.75 \times (0^2-u^2)\\\\-2.99988=-0.375u^2\\\\u^2=\frac{-2.9988}{-0.375} \\\\u^2=7.9968\\\\u=\sqrt{7.9968}\\\\u=2.83m/s[/tex]
The book's initial speed = 2.83 m/s
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A machine launches a tennis ball at an angle of 45° with the horizontal, as
shown. The ball has an initial vertical velocity of 9.0 meters per second and an initial
horizontal velocity of 9.0 meters per second. The ball reaches its maximum height
0.p2 second after its launch. [Neglect air resistance and assume the ball lands at the
same height above the ground from which it was launched.]
Elapsed Time
+0.92 s
Viy = 9.0 m/s
Launcher
V = 9.0 m/s
45
Horizontal
The total horizontal distance traveled by the tennis ball during the entire time it is in the air is
The motion or path of the tennis ball is the path of a projectile, which has
both vertical and horizontal motion.
The total horizontal distance traveled by the tennis ball during the entire
time it is in the air ≈ 16.514 meters.
Reasons:
The given parameters are;
The direction in which the ball is launched = 45°
The initial vertical velocity of the ball, [tex]v_y[/tex] = 9.0 m/s
The initial horizontal velocity of the ball, vₓ = 9.0 m/s
The time it takes the ball to reach the maximum height, t = 0.92 seconds after its launch
The total horizontal distance traveled, by the tennis ball is given by the formula;
[tex]\Delta d_x = \dfrac{v_1^2 \cdot \left( 2 \cdot cos(\theta) \sin(\theta)}{y} = \dfrac{2 \times v_x \times v_y}{g}[/tex]
Which gives;
[tex]\mathrm{The \ total \ distance \ travelled, \ \Delta} d_x = \dfrac{2 \times 9.0\times 9.0}{9.81} \approx 16.514[/tex]
The total horizontal distance traveled by the tennis ≈ 16.514 meters
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In this closed system, a dog has sprinted to the top of a cliff. The dog (mass of 25kg) had been sprinting with a velocity of 13m/s. Using what you know about potential and kinetic energy in systems, how tall is the cliff?
Given:
mass =
height =
velocity =
Formula for a closed KE/PE system:
Plug in the numbers:
Answer (with Units):
An object with a kinetic energy of 1125J has a
mass of 250kg. What is its velocity?
Answer:
3 m/s
Explanation:
Kinetic energy of a body is given by the formula [tex]K= {1\over2} m v^2[/tex]. Let's replace everything we have and solve for what's left.
[tex]1125J = {1\over2}\cdot 250 kg \cdot v^2[/tex]
[tex]v^2 ={ 1125 \cdot 2 \over 250}}[/tex] or [tex]v= 3 {m \over s}[/tex]
Could someone please help me
Answer:
the size of the shadow will be smaller due to smaller hands
Could someone please help
Answer: Dispersion
Explanation:
force (f) = ?
mass (m) = 75kg
gravity (g) = 9.8m/s^2
Answer:
735 N
Explanation:
Please i really need help on this
Which statement is true?
A. Magnetic North is geographic North
B. A compass needle points south
C. Magnetic electrons flow out North and into South
D. Earth's magnetic field reaches past the Milky Way.
(A magnetic compass does not point to the geographic north pole. A magnetic compass points to the earth's magnetic poles, which are not the same as earth's geographic poles. Furthermore, the magnetic pole near earth's geographic north pole is actually the south magnetic pole. When it comes to magnets, opposites attract.)
Tell me in simple words what gravitation is.
Answer:
The movement, or a tendency to move, toward a center of gravity, as in the falling of bodies to the earth is called gravitation
The diagram shows an idea for a perpetual motion machine. The car runs on electricity. As it moves along, the air moving past the car turns the generator on the roof. This generates the electricity needed to power the car.
Question on the paper
Let us begin by explaining the Energy transformation that will take place
Because the car runs on electricity, electrical energy that is stored in form of chemical energy is converted to mechanical energy that causes the car to moveNow when the car is in motion, the fan rotates, and my means of electro magnetic induction, the rotational(Mechanical Energy) possessed by the fan is converted to electrical energy which will then be converter to chemical energy stored in the battery of the carOk, let us discuss about why the idea will not work
Although the system will work, but to some extent, that is it will not sustain the process, over time the system will consume more energy than it will generate
Going my the law of thermodynamics "There is no perpetual motion machine of the first order" hence theoretically the system is not possible
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I cant figure this out for so long. thank you in advance whoever helps me
Answer:
a magnet is a material with a North and South pole
What is the physics definition of work? How is work calculated? How would you calculate the amount of work done in a slapshot.
Answer:
1) Work is a measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. 2) Work is calculated through joules. 3) It's possible to calculate work by multiplying the amount of force applied by the distance that the force is applied. If we know the amount of force the stick applies to the puck and the distance that the stick is applying the force to the puck, we can figure out the amount of work done.
Explanation:
Hope this helped!- Nya~ :3
with what force will Annabella’s car hit a tree if her car has a mass of 5000 kg and an acceleration of 2 m/s2
Answer:
F=10,000N
Explanation:
F=ma
m=5000kg
a=2m/s^2
[tex]F=(5000kg)*(2m/s^{2} )\\\\\\\\F=10000N[/tex]
Answer:
[tex]\boxed {\boxed {\sf 10,000 \ Newtons}}[/tex]
Explanation:
We are asked to find the force of Annabella's car when it hits a tree.
According to Newton's Second Law of Motion, force is the product of mass and acceleration. Therefore, it is calculated using the following formula:
[tex]F=ma[/tex]
The mass of the car is 5000 kilograms and the acceleration is 2 meters per second squared.
m= 5000 kg a= 2 m/s²Substitute the values into the formula.
[tex]F= (5000 \ kg)(2 \ m/s^2)[/tex]
Multiply.
[tex]F= 10,000 \ kg*m/s^2[/tex]
Convert the units. 1 kilogram meter per second squared is equal to 1 Newton, so our answer of 10,000 kg*m/s² is equal to 10,000 Newtons.
[tex]F= 10,000 \ N[/tex]
Annabella's car hits the tree with a force of 10,000 Newtons.
Highest common factor of 12r and 10
I think the number 2, not sure
What is the difference between applied force and net force?
Answer:
A few examples.
After 8 hours of classes, you grab the door handle and start pushing on it, harder and harder, not realizing you have to pull. Applied force is how much you can exert on the door, plus the reaction of the frame. net force is zero - the door won't budge.
Indiana Jones, while trying to grab yet another treasure that belongs in a museum, triggered a trap and a sack weighting 600N is pushing over his head. Due to his old age he's not in shape, and he manage to push back with only 500N of force. Applied force is 600N from the weight, and 500N from the archeologist. With a net force of 100N towards the old man head.
Mario and Luigi have ran out of gasoline in their car, so they're stuck pushing. Due to being in peak condition, each one applies 800N to the side of the car, dragging it forward. Applied force is 800N from each plumber, and net force is 1600 N.
Why are telescopes normally placed at higher elevations?
First and foremost, starlight appears less distorted in the thin atmosphere on mountaintops. At high altitudes, there is less atmosphere to absorb infrared energy, which reveals details about some of the coldest objects in the universe, such as clouds of gas and dust and the disks of dust that give birth to planets.
3. When lightning passes through the atmosphere,
it can heat the air to 30,000°C (54,000°F), nearly
five times as hot as the surface of the sun. In
which state of matter would you expect to find
the air in the path of the lightning bolt?
How much horsepower does 2022 sentra’s 2.0-liter dohc 16-valve 4-cylinder engine produce?
Answer:
Every Sentra is powered by a 149-hp 2.0-liter four-cylinder engine that pairs with a continuously variable automatic transmission (CVT) and front-wheel drive.
Explanation:
Help with this physics
Please
Answer:
45555555555555555555
Explanation:
A body of mass 3kg and volume 4×10^-4m^3 is hung from balance graduated in newtons. What is the reading of the balance when the body is;
a. In air
b. Fully immersed in water
c. ⅓ immersed in water
d. Fully immersed in paraffin.(Density of water is 10^3kgn^-3 and Density of paraffin is 800kgm^-3
We employed the pressure P formulas. the reading of the balance when the body is;
a. In air = 29.4 N
b. Fully immersed in water = 3.9 N
c. ⅓ immersed in water = 20.9 N
d. Fully immersed in paraffin = 3.1 N
Given that a body of mass 3kg and volume 4×10^-4m^3 is hung from balance graduated in newtons. To know the reading of the balance when the body is;
a. In air
b. Fully immersed in water
c. ⅓ immersed in water
d. Fully immersed in paraffin.
We will employ the pressure P formulas.
P = F/A
and
P = ρgh
Where
ρ = density
g = acceleration due to gravity
h = height
F = force
A = area
F/A = ρgh
Cross multiply
F = ρghA
Where hA = Volume V
Therefore, F = ρgV
a. In air
F = mg
F = 3 x 9.8
F = 29.4 N
b. Fully immersed in water
F = ρgV
F = [tex]10^{3}[/tex] x 9.8 x 4 x [tex]10^{-4}[/tex]
F = 3.92 N
c. ⅓ immersed in water
F = (ρgV)/3 + 2/3(mg)
F = 3.92/3 + (2/3 x 29.4)
F = 1.3067 + 19.6
F = 20.9N
d. Fully immersed in paraffin.
F = ρgV
F = 800 x 9.8 x 4 x [tex]10^{-4}[/tex]
F = 3.136 N
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Jorge is driving along Route 120 at a speed of 25 m/s. Seeing a red light ahead, he applies the brakes and comes to rest in 3.7 seconds. What is
his rate of acceleration?
Answer:
I don't know...
I'm sorry
calculate the mass of the earth if the radius of the earth is 6.38 × 10^6
Answer:
C
Explanation:
C is i thing
9.(7 +1) Line I 9.7 +9.1 Line 2 The expression was rewritten using the Distributive Property 9. (7 + 1) equals 9. 7 which equals 63 9.7+ 9.1 equals 7 + 1 which equals 63. Submit Answer attempt 1 out of Privacy Policy Terms of Service
Answer:
Sorry
Explanation:
I really don't know what to say about this question I am not sure what to say about this
Can someone PLEASE HELP ME!!!!!!!!
Examples of mediums that waves can travel through are _______ Select ALL that apply.
A. Air
B. Water
C. Ground
D. Metal
Answer:
air and water
Explanation:
The matter through which a mechanical wave travels is called the medium (plural, media). There are three types of mechanical waves: transverse, longitudinal, and surface waves. They differ in how particles of the medium move when the energy of the wave passes through. The particles in a medium become disturbed and pass on this disturbance to the next one, and so on. So, the disturbance caused by the particles can travel through a medium such as air, ocean water, land, violin strings, Slinky coils, etc. Sound waves can travel through solids, liquids, or gases.
A rock is thrown upward with a speed of 2.0m/s.
a. How long will it take the rock to reach the peak?
b. What is the maximum height it can reach?
Hi there!
(A)
When the rock reaches the peak, it will have a vertical velocity of 0 m/s. We can use the equation:
vf = vi + at
vf = final velocity (0 m/s)
vi = initial velocity (2 m/s)
a = acceleration (in this situation, due to gravity = 9.8 m/s²)
t = time (s)
0 = 2 + (-9.8)t
2/9.8 = t = .204 sec
(B)
Use the equation:
d = vit + 1/2at²
d = 2(.204) + 1/2(-9.8)(.204²)
d = .204 m
Two forces 6.0 N and 10.0 N act on an object at the same time.
Which force cannot be the resultant force on the object?
A
8.0 N
vu
LO
B
10.0 N
с
14.0 N
D
18.0 N
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Correct choice is ~
D. 18.0 Newtons
because the resultant force can't exceed 16 Newtons ~
When a machine increases speed or force, another factor must have ________to do so. *
Answer:
thermal energy
Explanation:
Are these pictures below an example of reflection or refraction?
Answer:
Refraction
Explanation:
Reflection involves a change in direction of waves when they bounce off a barrier.
Refraction of waves involves a change in the direction of waves as they pass from one medium to another.
Please mark as brainliest if this helps! :)
Công thức tính gia tốc hướng tâm trong chuyển động tròn đều
a. aht = v2/R. B. aht = v2R. C. aht = 2R. C. aht = 42f2/R.
Answer:
I am really sorry but I can't understand the question.
Can you translate the question to English?
Explanation:
