Answer:
what about it i need more info
Explanation:
Why does ice change into water on heating ?
Answer:
Explanation:
Changing states of matter and energy
A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. If heat is removed from water vapour, the gas cools down and it condenses back into liquid water. Continue to cool the water (by removing heat), and it becomes solid ice.
plz mark as brainliest
"A farmer needs to get hay to cows in a frozen field. Using an airplane flying 40 m/s, at a height of 280 m, how far from the cow would she have to release the hay in order to hit the cow?" What is the horizontal velocity you would use to solve this problem?
Answer:
x = 302 m
Explanation:
Given that,
Speed of an airplane, v = 40 m/s
Height, h = 280 m
40 m/s is the horizontal velocity we should use to solve the given problem.
Let t is the time when the hay will reach the ground. It can be calculated using second equation of motion as follows :
[tex]h=ut+\dfrac{1}{2}at^2[/tex]
Here, u = 0 and a = g
[tex]h=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2\times 280}{9.8}} \\\\=7.55\ s[/tex]
Let the horizontal distance is x. It can be calculated as :
x = vt
x = 40 m/s × (7.55 s)
x = 302 m
Hence, at a distance of 302 m she have to release the hay in order to hit the cow.
Which type of thermal energy causes ocean currents?
Answer:
convection thermal energy causes ocean currents?
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
Together with a friend, you are carrying a ladder that weighs 130 N. You have cleverly convinced your friend to hold the ladder 0.1 m from the center of gravity, while you yourself are 1.5 m from the center of gravity. How much of the weight of the ladder are you yourself supporting?
Answer:
W₁ = 8.12 N
Explanation:
Consider the weight supported by the person and friend to be:
W₁ = Weight supported by person
W₂ = Weight supported by Friend
Now, their sum must be equal to total weight of ladder. Hence,
W₁ + W₂ = 130 N
W₂ = 130 N - W₁ ---------------- equation (1)
Now, to carry the ladder, the moment due to both person's forces must be equal:
Moment due to person 1 = Moment due to friend
W₁ d₁ = W₂ d₂
where,
d₁ = distance between person and center of gravity = 1.5 m
d₂ = distance between friend and center of gravity = 0.1 m
W₁(1.5 m) = W₂(0.1 m)
W₁ = W₂ (0.1 m/1.5 m)
W₁ = W₂(0.06667)
using equation (1):
W₁ = (130 N - W₁)(0.06667)
W₁ + 0.06667W₁ = 8.6667 N
W₁ = 8.12 N
plz answer this now anyone plz
Answer:
dx = - 0.0789[m]
Explanation:
In order to solve this problem, we must remember that the vertical component of a vector can be determined using the opposite catheter of the right triangle, by means of the sine function.
[tex]d_{x}=0.250*sin(18.4)\\d_{x} = 0.0789 [m][/tex]
Since the component is directed down, the sign is negative.
dx = - 0.0789[m]
A car travels a distance of 3330 meters in 165 seconds what is the velocity
Answer:
Velocity = 20.18 m/s
Explanation:
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
[tex]Velocity = \frac{distance}{time}[/tex]
[tex]V = \frac{d}{t}[/tex]
Given the following data;
Distance, d = 3330m
Time, t = 165 secs
*To find the velocity*
Substituting into the equation, we have;
[tex]V = \frac{3330}{165}[/tex]
Velocity = 20.18 m/s
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 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]
i need help!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
With??
Explanation:
15. What is uniform velocity? Calculate the acceleration of a body moving with uniform
velocity
Answer: Uniform Velocity-A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however, the time intervals may be small. ... Examples of the body moving with variable velocity: 1.
Explanation:
Four ropes each attached to the end of a freight elevator are used to pull the small elevator upward through a wide elevator shaft of the forces list below which act upon the elevator
These options are missing in the question
(a) Normal force
(b) Gravity force
(c) Applied force
(d) Friction force
(e) Tension force
(f) Air tension
Answer:
(b) Gravity force
(e) Tension force
(f) Air resistance
Explanation:
Normal force: NO, Normal force acts when body surfaces are in contact to push each other since lift is hanging and no surface contact is there so no Normal force.
Gravity force: YES. This force is acted on each and every body that lies in the vicinity of earth's gravitational field, as the life is hanging so it will experience Gravity force.
Applied force: NO.as there is no force given to the Elevator.
Friction force: NO. Friction fore occurs when bodies rub against each other or has a surface of contact, lift do not touch any surface hence no Frictional force.
Tension force: YES. The Elevator is hanging with the support of Four ropes and tension is acting in these ropes.
Air resistance: YES. The Elevator will experience Air resistance as it will move through the wide shaft.
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 car at point A travels at a constant velocity of 80km/h towards point B. the distance between the points is 160km. how long does it take to get from point A to point B
Answer:
t = 7200.07seconds or 2 hours
Explanation:
given:
velocity (v) : 80km/h = 80 × 1000 m/ 60 × 60 s
= 80,000m/3600s => 22.222m/s
distance(d) = 160km => 160 × 1000 = 160,000m
time(t) = ?
since v=d/t
therefore, t= d/v
t= 160,000/22.222
t= 7,200.07seconds
or t= 7,200/3600 = 2 hours.
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:
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.
a resistor, of resistance 47 , is damaged when it dissipates a power greater than 0.5W. determine the maximum voltage that can be applied without damaging the resistor
Answer:
The maximum voltage that can be applied without damaging the resistor is 4.85 V
Explanation:
Electric Power in a Resistor
Given a resistor or resistance R connected to a circuit of voltage V carrying a current I. The relation between these three magnitudes is given by Ohm's Law:
V = R.I
The dissipated power P of a resistor can be calculated by the following equation, known as Joule's first law:
[tex]P = I^2.R[/tex]
Solving the first equation for I:
[tex]\displaystyle I=\frac{V}{R}[/tex]
Substituting in the second equation:
[tex]\displaystyle P=\frac{V^2}{R^2}.R[/tex]
Simplifying:
[tex]\displaystyle P=\frac{V^2}{R}[/tex]
Solving for V:
[tex]V=\sqrt{P.R}[/tex]
The resistor has a resistance of R=47Ω and can hold a maximum power of P=0.5 W, thus the maximum voltage is:
[tex]V=\sqrt{0.5\cdot 47}[/tex]
[tex]V=\sqrt{23.5}[/tex]
V = 4.85 V
The maximum voltage that can be applied without damaging the resistor is 4.85 V
Please can I have help. This was ment to be due 1 week ago
Answer:
water can be used as displacement to calculate the volume of a solid object.
Answer: If the object has an irregular shape , the volume can be measured using a displacement can . The displacement can is filled with water above a narrow spout and allowed to drain until the water is level with the spout. As the irregular object is lowered into the displacement can, the water level rises.
Explanation: google
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.
To learn more about heater refer to the link:
brainly.com/question/29547273
#SPJ6
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
here you go, just answer the question, 100 points
Answer:
THANK YOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
Explanation:
I REALLY NEED THIS
Answer:
Oh my gosh yayyy one of the asnwers got deleted!!!! Yay thx for the points
Explanation:
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:
This man proposed that all matter was composed of atoms
Answer:
Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. while all atoms of an element were indentical , different element had atoms of differing size and mass.
Explanation:
hope it's helpful
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
What is the speed of a bobsled that traveled 100m in 25s
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?
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
which relationship benefits two organisms
Answer:
mutualism
Explanation:
Mutualism, a relationship in which both species benefit, is common in nature. In microbiology, there are many examples of mutualistic bacteria in the gut that aid digestion in both humans and animals.
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.
Learn more about the Galaxy here: https://brainly.com/question/15906708
#SPJ2
can y’all answer this I asked so many times I’m loosing points
At what temperature will the air in the oven have a thermal energy of 5.0 x 10 J?
Answer:
I think it is 50 j, I am not sure and also please let me know if I am wrong.
Answer: hey
Explanation:
