Answer:
I prefer to write the full question.....I think you should too.....or this is just free points?
how does the friction get affected by the nature of surface?
Answer:
The heat causes the molecules on rubbing surfaces to move faster and have more energy.
A cupboard is placed in front of a heater. Air can move through a gap under the cupboard.
Which row describes the temperature, and the direction of movement, of the air in the gap?
air temperature
air direction
A
cool
away from the heater
B
cool
towards the heater
C
warm
away from the heater
D
warm
towards the heater
Answer:
B
Explanation:
A cupboard is placed in front of a heater. Air can move through a gap under the cupboard will cool towards the heater.
What is heater?A heater is a device for supplying heat, for example a radiator or a convector. These water heaters heat water only when it is needed. Turn on the heater and the interior of the car will soon warm up. A heater is a device for supplying heat, for example a radiator or a convector.
A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. The temperature, and the direction of movement, of the air in the gap under the cupboard will cool towards the heater.
A cupboard is placed in front of a heater. Air can move through a gap under the cupboard will cool towards the heater.
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Guys PLZ I NEED HELP
The Colorado Plateau includes large parts of Utah, Colorado, Arizona, and New Mexico. The plateau is known for unique rock formations, many in brilliant shades of red, as shown here. This red rock is formed by the reaction of iron and oxygen to form iron oxide.
Which type of weathering has occurred to cause the rock within the Colorado Plateau to become red?
A.
Oxidation
B.
Carbonation
C.
Abrasion
D.
Hydrolysis
Answer: Oxidation
Explanation:
Because it is :)
Answer:
A. Oxidation
Explanation:
IVLA - I just finished the test. Trust me.
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..
If the mass of Earth increased, with no change in radius, your weight
would
Answer:
Increase
Explanation:
If the mass of the earth increase, with no change in radius, one's weight would also increase considerably.
The reason for this is that, the gravitational force of attraction between the two bodies will increase.
The gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. So, increasing the mass of the earth will increase the gravitational force on one's body and hence, an increase in weight.1. Two objects are separated by a distance of 1.60 m. One object has a mass of 75 kg and the other has a mass of 50 kg. What gravitational force exists between the two objects?
Answer:
airestence?
Explanation:
A homeowner is thinking about replacing his filament bulbs with LED bulbs.
A 12 W LED bulb gives the same light output as a 60 W filament bulb.
Suggest reasons why the homeowner is likely to choose LED bulbs.
Use the information given in the table
Answer:
because it would reduce the use of more electricity for same light output
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
A 0.25 kg Soccer ball is rolling at 6,0 m/s toward a player, The player kicks the ball in the opposite direction and gives it a Velocity of 24.0 m/s. A) What is the change in Momentum of the Ball? B) If the actual kick lasts ,02 selonds, what Force acts on the ball?
Answer:
A) ΔP = 4.5 [kg*m/s]
B) F = 375 [N]
Explanation:
The linear momentum is defined as the product of the mass of a body by Velocity, therefore we must calculate the momentum for each case.
[tex]P = m*v[/tex]
where:
P = linear momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
A)
When the soccer ball is rolling towards the player
[tex]P =0.25*6\\P = 1.5[kg*\frac{m}{s}][/tex]
After kicking the ball
[tex]P = 0.25*24\\P = 6 [kg*\frac{m}{s} ][/tex]
Therefore the change momentum is equal to
ΔP = 6 - 1.5 = 4.5 [kg*m/s]
B) Momentum is defined as the force applied for a certain time, this momentum produces a linear momentum.
We must be especially careful in the directions of the movement, since depending on the direction a positive or negative sign must be included according to the established convention. In this particular case we are going to take the kick and the direction of this as positive, that is to say, the ball moves in the negative direction and after hitting the ball it moves in a positive direction.
[tex]-(m*v_{1}) + F*t = (m*v_{2})\\-(0.25*6) + (F*0.02) = (.25*24)\\F*0.02= (7.5)\\F = 375 [N][/tex]
You are a passenger in a truck that gets stuck in mud. You and the driver use a tree branch as a lever to lift up the truck. You apply an effort force of 600 N to the branch. The back of the truck weighs 2400 N. What is the mechanical advantage of the branch-lever?
Answer:
i think it is 1,800
Explanation:
Which list correctly names the three types of galaxies?
1.binary, open, globular
2.elliptical, open, binary
3.irregular, spiral, elliptical
4.open, irregular, spiral
Answer:
3.irregular, spiral, elliptical
Irregular, spiral and elliptical are the three types of galaxies present.
What is the Galaxy?Huge collection of billions of stars along with their solar systems, gas and dust is termed as the galaxy.Gravity holds the galaxy together.
Types of galaxies:
Spiral: These are the galaxies with the spiral shape and curved arms.Elliptical: These are the smooth and oval shaped galaxies.Irregular: These galaxies are neither spiral nor elliptical but they look like blobs.Therefore, irregular, spiral, and elliptical are the three types of galaxies present.
Hence, option (3) is correct.
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Un avión sale de Bs. As. Con destino a Madrid distante 10000 Km y con una V= 800 Km/h y MRU. A la misma hora sale de Madrid hacia Bs. As. Otro avión con V= 1200 Km/h. Calcula el tiempo de encuentro y la distancia de cada uno en que se encuentran.
Answer:
Los aviones se encuentran a las 5 horas a una distancia de 4000 kilómetros desde Buenos Aires.
Explanation:
Asumimos que Buenos Aires y Madrid están en las posiciones [tex]x = 0\,km[/tex] y [tex]x = 10000\,km[/tex], respectivamente. También conocemos por el enunciado que ambos aviones experimentan un Movimiento Rectilíneo Uniforme. Las ecuaciones cinemáticas de cada avión son las siguientes:
Buenos Aires - Madrid
[tex]x_{A} = x_{A'}+v_{A}\cdot t[/tex] (1)
Madrid - Buenos Aires
[tex]x_{B} = x_{B'} + v_{B}\cdot t[/tex] (2)
Donde:
[tex]x_{A'}[/tex], [tex]x_{B'}[/tex] - Posiciones iniciales de los aviones, medidas en kilómetros.
[tex]x_{A}[/tex], [tex]x_{B}[/tex] - Posiciones finales de los aviones, medidas en kilómetros.
[tex]v_{A}[/tex], [tex]v_{B}[/tex] - Velocidades de los aviones, medidas en kilómetros por hora.
[tex]t[/tex] - Tiempo, medido en horas.
Si sabemos que [tex]x_{A'} = 0\,km[/tex], [tex]x_{B'} = 10000\,km[/tex], [tex]v_{A} = 800\,\frac{km}{h}[/tex], [tex]v_{B} = -1200\,\frac{km}{h}[/tex] y [tex]x_{A} = x_{B}[/tex], entonces obtenemos la siguiente fórmula:
[tex]0+800\cdot t = 10000-1200\cdot t[/tex] (3)
[tex]2000\cdot t = 10000[/tex]
[tex]t = 5\,h[/tex]
Ahora obtenemos la posición en la que se encuentran ambos aviones al sustituir los valores conocidos en (1):
[tex]x_{A} = 0+800\cdot (5)[/tex]
[tex]x_{A} = 4000\,km[/tex]
Los aviones se encuentran a las 5 horas a una distancia de 4000 kilómetros desde Buenos Aires.
A school bus traveling at 12 m/s has a momentum of 144,000 kg.m/s. What is the mass of the bus?
The mass is 12,000
144,000 divided by 12 = 12,000
Momentum = mass × velocity
For a moving object, the force acting on the object varies directly with the object's acceleration. When a force of45N
acts on a certain object, the acceleration of the object is5m/s∧2
. If the force is changed to81N
, what will be the acceleration of the object?
Answer:
9
Explanation:
the force is directly proportional to acceleration
F=ma
F1/a1=F2/a2
45/5=81/a2
81×5/45=9M/S²
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.
An object accelerates from rest and travels 53 m west in 5.2 s. Determine the acceleration
of the object
Answer:
20.4m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Distance = 53m
Time = 5.2s
Unknown:
Acceleration = ?
Solution:
This is a linear motion and we use the right motion equation;
S = ut + [tex]\frac{1}{2}[/tex]at²
S is the distance
u is the initial velocity
a is the acceleration
t is the time
Insert the parameters and solve;
53 = (0x 5.2) + [tex]\frac{1}{2}[/tex] x a x 5.2
53 = 2.6a
a = [tex]\frac{53}{2.6}[/tex] = 20.4m/s²
When a 15.00 kg mass is attached to a vertical spring, the spring is stretched 2.0 m such that the mass is 6.0 m above the table. The spring constant is 400.0N/m? What is the total potential energy associated with this system?
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:
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.
( ANSWER QUICK PLS NEED FAST ) What is the opposite force to pushing off the ground to jump?
A The ground pushing off your foot
B The ground pulling your foot down
C Gravity pulling your foot down
D Your leg pushing off your foot
ANSWER
A)
Explanation:
Due to normal force from ground
Answer:The ground pushing off your foot
Explanation:
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
A toy car is tied to a post with string, causing it to drive in a tight circle. This is
shown in the picture below.
In which direction will the toy car go if the string breaks?
Answer:
C
Explanation:
Because it will be flying to the left
Answer:
D
Explanation:
because if the toy car flies off the string it would go in D's direction not C's
The old force goes from 10N to 2N while you double each of the masses. What happened to displacement?
Answer:
5n
Explanation:
10n divided by 2n is 5n
What is the speed of a bobsled that traveled 100m in 25s
How fast is it moving after 1.00 s
Answer:3
Explanation:
True or false MRI scans, X rays, and tomography help doctors see bones inside a persons body?
Help This is Urgent
You are traveling at 25 meters per minute North on your Super Scooter. It takes you 90 minutes to reach your destination. How far did you travel?
Question 1 options:
2250 m/m
36 m/m
2250 m/m North
36 m/m North
9514 1404 393
Answer:
2250 m North
Explanation:
distance = velocity × time
= (25 m/min North)(90 min) = 25×90 m North = 2250 m North
_____
We're not sure what the m/m units are supposed to be in the answer choices. The displacement is measured in meters. The time units cancel when you multiply velocity by time.
__
The question "how far" is somewhat ambiguous in this context. It might refer to the distance only (2250 m), or it might refer to the distance in a particular direction (2250 m North).
What is the mechanical advantage of a wedge, with input force of 2.4 N and output force of 5.3 N
Answer:
approx. 2.21
Explanation:
5.3/2.4 = 2.208
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
How much power is generated by a motor that can do 3,000j of work in 75s
Answer:
40watts
Explanation:
Given parameters:
Work done = 3000J
Time = 75s
Unknown:
Power generated = ?
Solution:
Power is the rate at which work is done;
Power = [tex]\frac{work done}{time}[/tex]
Now, insert the parameters and solve;
Power = [tex]\frac{3000}{75}[/tex] = 40watts
