Answer:
The reason is because a heat pump uses external power to accomplish the work of transferring energy from the heat source to the heat sink. Heat pumps are significantly more energy efficient than simple electrical resistance heaters. The efficiency begins to decrease as the temperature difference between the heat source and sink increases.
what is the speed of an object that travels 188m in 52 seconds
Answer:
3.6
Explanation:
plz mark brainliest | (• ◡•)|
In projectile mtion, what is the x-component of the initial velocity? if V= Vi = 100 m/s and the angle with horizontal axis Θ = 60 degrees
Answer:
???????????????????????
Explanation:
The x - component of the initial velocity is given as:
Ux = Vi cos theta
Ux = 100cos 60
Ux = 50m/s
please help:(
an objects motion will change only if a(n) ____ force acts on the object
_____ force is the combination of all the forces acting on an object
Answer: 1. A Unbalanced force and net force
Explanation:
The combination of all forces acting on a object is called a Net Force, and a Unbalanced force can cause an object to stop, start moving or change direction.
Crate is being pushed a constant velocity. What forces are being used?
what is binary fission
what is metabolism
Answer:
Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts to separate entities resembling the original. The object experiencing fission is usually a cell, but the term may also refer to how organisms, bodies, populations, or species split into discrete parts.
Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are: the conversion of food to energy to run cellular processes; the conversion of food/fuel ...
Explanation:
1. A 55 kg man runs up the stairs below in 5 seconds. How many watts of power did he use?
2. A 55 kg man runs up the stairs below in 5 seconds. How can he reduce the power he uses?
Answer:
Explanation:
Power = Force * distance/time
Given
mass = 55kg
Force = 55 * 10 = 550N
Let the distance covered be 8m
time taken = 5secs
Required
Amount of Power used
Power = 550 * 8/5
Power = 110 * 8
Power = 880 Watts
2) The way he can reduce the amount of power expended is to reduce the amount of stairs or the distance covered in a specified period of time.
The Northern Lights are caused by solar ____ bombarding the upper atmosphere of Earth.
Answer:When charged particles from the sun strike atoms in Earth's atmosphere, they cause electrons in the atoms to move to a higher-energy state. When the electrons drop back to a lower energy state, they release a photon: light. This process creates the beautiful aurora, or northern lights.
Explanation:
Which of the following has a positive charge and a mass of one?
a
electron
b
proton
c
element
d
positivon
e
neutron
Answer:
the answer is protons b
Explanation:
brainliest if 1st one..
A 30 N rock falls from a 40 m cliff. At what point during its fall are its
potential and kinetic energies equal?
Answer:
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
Explanation:
Potential and Kinetic Energy
The gravitational potential energy is the energy an object has due to its height above the ground. The formula is
[tex]U=mgh[/tex]
Where:
m = mass of the object
g = acceleration of gravity (9.8~m/s^2)
h = height
Note we can also use the object's weight W=mg into the formula:
[tex]U=Wh[/tex]
The kinetic energy is the energy an object has due to its speed:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where v is the object's speed.
Initially, the object has no kinetic energy because it's assumed at rest.
The W=30 N rock falls from a height of h=40 m, thus:
[tex]U=30*40=1,200 J[/tex]
Since the sum of the kinetic and potential energies is constant:
U' + K' = 1,200 J
Here, U' and K' are the energies at any point of the motion. Since both must be the same:
U' = K' = 600 J
U'=Wh'=600
Solving for h':
[tex]\displaystyle h'=\frac{600}{W}=\frac{600}{30}=20~m[/tex]
Both energies are equal when the rock has fallen 20 m or equivalently when it is at a height of 20 m.
How did life evolve from nonliving matter?
Answer: it is proposes that in Earth's prebiotic history, simple organic matter was exposed to energy in the form of volcanoes and electrical storms
Explanation:
A negative body image can affect your fitness because being healthy asks you to keep
up a positive attitude and make smart choices.
O True
O False
Answer:
True
Explanation:
because if your body image is negative your holistic health is will affect
If we ignore air resistance (as we normally do) and launch a projectile at an angle between zero and 90o, how does the magnitude (size) of the vertical component of the velocity change as time elapses? Group of answer choices
Answer:
First, remember that:
Acceleration = dV/dt
where V is velocity and t is time.
When you launch a projectile (θ between 0° and 90° means that you are not launching it into the ground) you are applying an initial velocity v0, that can be separated in components, where the vertical component will be:
v0*sin(v)
That initial vertical velocity is a constant, so it does not depend on time.
Then when we differentiate with respect to the time, that constant will vanish, and we will get:
rate of change of the vertical velocity = vertical acceleration.
And as you know, when we ignore the air resistance the only force acting on the vertical axis is the gravitational force, such that the vertical acceleration will be:
a(t) = -9.8m/s^2
Where the negative sign is because this force points down.
Then the rate of change of the vertical velocity will be exactly that, -9.8m/s^2.
And the vertical velocity equation, to see exactly how the vertical velocity depends on time, will be:
V(t) = (-9.8m/s^2)*t + v0*sin(θ)
If we shake the branches of a tree, the fruits fall
Answer:
When a branch of a tree is shaken, some of the fruits may fall down. Why? Solution : The fruits fall down due to inertia of rest.
Answer:
I HOPE IT WILL HELP YOU A LOT....
What happens to the gravitational force between two objects as the objects move closer together?
Answer:
The Gravity gets stronger
Explanation:
Newtons laws of motion.
70 Joules of work are done pushing a cart 3.5 meters across the floor.
What average force was applied to the cart while this work was done? *
Answer:
20
Explanation:
force=work done÷distance
How does La Niña affect the climate of the Pacific Ocean?
The ocean becomes cooler.
The warm water moves toward the east.
The cold water sinks deeper into the ocean.
The strength of the prevailing winds decreases.
Answer:
The ocean becomes cooler
Explanation:
La Niña is a phase of a natural climate pattern which occurs across the tropical Pacific Ocean and swings back and forth every 3 - 7 years on the average.
Now, during La Niña, the surface winds across the entire tropical Pacific Ocean are usually stronger than they are on the average, and in return most of the tropical Pacific Ocean will become cooler than they are on average.
Thus, looking at the given options, the correct one is;
The ocean becomes cooler
The way in which La Niña affects the climate of the Pacific Ocean is that: A. The ocean becomes cooler.
La Niña is a complex oceanic and atmospheric phenomenon that occur due to variations in ocean temperatures across the equatorial band of the Pacific Ocean, at a specific period of time in years. Also, it is a colder part of the El Niño-Southern oscillation climate pattern.
Basically, La Niña causes the surface winds blowing across the equatorial band of the Pacific Ocean to be stronger while reducing tropical cyclogenesis. Consequently, this causes the climate of the Pacific Ocean to become cooler.
Read more on La Niña here: https://brainly.com/question/8605307
How fast is it moving after 1.00 s
Answer:3
Explanation:
Explore how a kaleidoscope works. Find two mirrors, and hold them upright on the desk, so they are at an angle to each other like an open book. Set an object between them, and look in the mirrors. How many images do you see? Slowly bring the mirrors together. What happens? Are the images you see the same? Can you explain what you see?
Answer:
there is an infinite number of images because it is reflected off of the mirrors. the images in the mirror will "move" if either mirror is shifted because the angle of reflection. the images are the same because its just a repeated reflection. i see the object on both sides, repeated as far as i can see in both mirrors.
Explanation:
True or false MRI scans, X rays, and tomography help doctors see bones inside a persons body?
What happens to the angle of reflection with respect to the angles of incidence?
Please help ASAP
Will give you 15 points !!!
Answer:
The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.
Explanation:
Which statement accurately describes the relationship between weight and
mass?
A. Mass is an object's weight multiplied by its diameter.
B. Weight is an object's mass multiplied by its diameter.
C. Mass is an object's weight multiplied by the amount of
gravitational force acting on that object.
O D. Weight is an object's mass multiplied by the amount of
gravitational force acting on that object.
Answer:
D. Weight is an object's mass multiplied by the amount of
gravitational force acting on that object.
Explanation:
I got it right on the test
Weight is an object's mass multiplied by the amount of gravitational acceleration acting on that object. Hence, option (D) is correct.
What are mass and weight?The most fundamental characteristic of matter is its mass, which is one of the fundamental physical quantities. Mass is a term used to describe how much matter is there in a body. The kilograms is the SI unit of mass.
The amount of a body's weight indicates how much gravity is pulling on it. The weight formula is as follows: w = mg Since weight is a force, it has the same SI unit as a force, which is the Newton.
When we look at how weight is expressed, we can see that it depends on both mass and the acceleration caused by gravity. Hence, weight is an object's mass multiplied by the amount of gravitational acceleration acting on that object.
Learn more about weight here:
https://brainly.com/question/10069252
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if the octupus had twelve arms then how many arms would the crab have show your work
Answer:
I believe that the crab would have 14 arms if the octopus had 12 arms
Explanation:
to keep the blood flowing and bring energy
When you exercise, you need
to the large muscles groups.
glucose
dopamine
water
oxygen
Answer:
Glucose
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pls help me this is being timed.
Answer:
Increase air resistance
Explanation:
Gravity forces the parachute down but air resistance pushing up on the flat surface of the parachute causes it to fall slower to the ground.
Why is “soft” iron used for the core of an electromagnet?
It is difficult to magnetize.
It has no magnetic domains.
It is a permanent magnet.
It is easily magnetized.
Answer:
It is difficult to magnetize.
Convert i) 1 microgram into kilogram
ii) 100 decameter into cm
Answer:
1×10^-9kilogram
100 decameter =100000cm
Answer:
1 microgram into kilogram
1000000000microgram=1kilogram
1 microgram:1/1000000000kilogram
and
100 decameter into cm
1decameter:1000cm
100 decameter :100000
The elements in a column of the periodic table _____.
A.have very similar chemical symbols
B.have the same atomic mass
C.have similar properties
Which energy transformation pops the corn kernels
Answer:
heat?
Explanation:
What is the work required to lift a 10 kg box off the ground to a height of
5.0 m?
Answer:
490J
Explanation:
Given parameters:
Mass of box = 10kg
Height = 5m
Unknown:
Work done = ?
Solution:
Work done can be derived from the product of force and distance;
Work done = force x distance
Force here is applied by gravity and it is the weight
The distance is the height
Work done = weight x height
Work done = mass x acceleration due to gravity x height
Work done = 10 x 9.8 x 5 = 490J
A marble is thrown horizontally with a speed of 7 m/s. When the marble lands, it hastraveled a horizontal displacement of 30 m. How much time was the marble in the air?
Answer:
t = 4.28 s
Explanation:
The horizontal speed of a marble = 7 m/s
The horizontal displacement covered by the marble = 30 m
We need to find the time for which the marble is in air. Let the time is t. Using the formula for speed to find it as follows :
[tex]s=\dfrac{d}{t}\\\\t=\dfrac{d}{s}\\\\t=\dfrac{30\ m}{7\ m/s}\\\\=4.28\ s[/tex]
So, it will in the air for 4.28 s.
