Please help, this has to do with kinematic equations
A body moving with uniform acceleration has a velocity of 15.9 cm/s when its x coordinate is 4.26 cm.
If its x coordinate 2.62 s later is −3.18 cm, what is the x-component of its acceleration?
Answer in units of cm/s²
Answer:
[tex]a=-14.3\ cm/s^2[/tex]
Explanation:
Given that,
Initial velocity of a body, u = 15.9 m/s
Initial position, [tex]x_i=4.26\ cm=0.0426\ m[/tex]
Final position, [tex]x_f=-3.18\ cm=-0.0318\ m[/tex]
Time, t = 2.62 s
We need to find the x-component of its acceleration. using second equation of motion to find it as follows :
[tex]x_f-x_i=ut+\dfrac{1}{2}at^2[/tex]
Putting all the values to find a.
[tex]-3.18-4.26=15.9(2.62)+\dfrac{1}{2}a(2.62)^2\\\\-49.098=3.4322a\\\\a=-14.3\ cm/s^2[/tex]
So, the acceleration of a body is [tex]-14.3\ cm/s^2[/tex].
When the amount of which 2 gases in the atmosphere change, the amount of energy absorbed by the surface changes.
Answer:
The earth-atmosphere energy balance is the balance between incoming energy from the Sun and outgoing energy from the Earth. Energy released from the Sun is emitted as shortwave light and ultraviolet energy. When it reaches the Earth, some is reflected back to space by clouds, some is absorbed by the atmosphere, and some is absorbed at the Earth's surface.
Explanation:
Which of the following groups have one valence electron and are very reactive
A-column 1 alkali metals
B-Column 2 alkaline earth metals
C-column 17 halogens
D-column 18 noble gases
Tanya and her brother are racing with their new bikes in the neighborhood. Their block is one mile long. Tanya's average speed is 0.15 mi/s and her brother's is 0.11 mi/s. Who will reach the end of block first, and how much time ahead of the other will they be?
Answer:
Tanya
[tex]2.43\ \text{s}[/tex]
Explanation:
[tex]d[/tex] = Distance traveled = 1 mile
[tex]s_t[/tex] = Tanya's average speed = [tex]0.15\ \text{mi/s}[/tex]
[tex]s_b[/tex] = Tanya's brother's average speed = [tex]0.11\ \text{mi/s}[/tex]
Time taken by Tanya
[tex]t=\dfrac{d}{s_t}\\\Rightarrow t=\dfrac{1}{0.15}\\\Rightarrow t=6.67\ \text{s}[/tex]
Time taken by Tanya's brother
[tex]t=\dfrac{d}{s_b}\\\Rightarrow t=\dfrac{1}{0.11}\\\Rightarrow t=9.1\ \text{s}[/tex]
So Tanya will reach the end of the block first.
She will reach the end of the block by [tex]9.1-6.67=2.43\ \text{s}[/tex]
A 75.0 kg man is standing at rest on ice while holding a 4.00kg ball. If the man throws the ball at a velocity of 3.50m/s forward what will his resulting velocity be
Explanation
According to law of conservation of momentum
m1u1 + m2u2 = (m1+m2)v
m1 is mass of the man 75kg
u1 is the velocity of the man 0m/s
m2 is the mass of the ball = 4kg
u2 is the velocity of the ball = 3.5m/s
We are to find v
Substitute
75(0)+4(3.5) = (75+4)v
0 + 14 = 79v
v = 14/79
v = 0.177m/s
Hence his resulting velocity will be 0.177m/s
Which of the following describes the amount
of heat needed to raise the temperature of
one gram of a substance by one degree?
11°
Specific heat.
Answer:
Specific heat
Explanation:
The specific heat of a substance is the amount of heat required to raise the temperature of 1g of such substance by 1K.
Specific heat of substance depends on the nature of the substance. For most conductors of heat, specific heat value is quite low because increase in temperature is attained very fast.
But for poor conductors such as water, they have a high specific heat capacity. They do not lose nor gain heat readily. More heat must be supplied to cause a significant rise in temperature.
The relationship;
H = m x c x Ф
shows the relationship between the amount of heat, mass , specific heat and temperature change.
H is the amount of heat
m is the mass
c is the specific heat
Ф is the temperature change
On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
36.7097837 kilograms-force
Explanation:
:3 Ight byez
The needs of society have no effect on technology. true or false
Answer:
False
Explanation:
A lot of inventors worked on inventions due to things that society needed. For example, Alexander Graham Bell created the telephone because we didn't have a stable line of communication back then.
Local winds and global winds are generally a result of which of the following?
O Earth's tilted axis.
O Unpredictable changes in the atmosphere.
O Variations in the energy received from the sun.
O Unequal heating of Earth's surface.
Answer: Unequal heating of Earth's surface
Explanation:
PLZ HELP IM SO CONFUSED
Answer:
convection
Explanation:
I'm right ya know
Answer:
I don't have an answer but your so pretty I'm jelly lol
You are moving a box across the floor with constant force of 50 N, the friction between the box and the floor is 20 N. After moving the box a distance of 10 m, what are: (a) net work done on the box. (b) your work done on the box. (c) work done by the friction? * 0 points
Answer:
(a) net work done on the box 300 J
(b) your work done on the box 500 J
(c) work done by the friction 200 J
Explanation:
Given;
applied force on the box, f = 50 N
frictional force between the box and the floor, fk = 20 N
distance you moved box, d = 10 m
(b) Work done on the box as a result of the applied force;
W = F x d
W = 50 x 10 = 500 J
(c) Work done against the box by friction;
Wk = 20 x 10 = 200 J
(a) net work on the box;
∑W = W - Wk
∑W = 500 J - 200 J
∑W = 300 J
If an object is in free fall for four seconds, about how fast
will it be falling?
a) 10 m/s
b) 20 m/s
c) 30 m/s
d) 40 m/s
___________ force is a supportive force that surfaces exert in order to prevent solid objects from passing through one another.
A. Contact
B. Regular
C. Normal
D. Field
The maximum kinetic energy of photoelectrons does not depend on
Answer:
intensity
Explanation:
When a photoelectric effect is observed, the number of electrons ejected is proportional to the intensity of the incident light. However, the maximum kinetic energy (KEMAX) of the photoelectrons is independent of the light intensity.
Which shows the correct order of forces, from weakest to strongest?
o weak, strong, gravitational, electromagnetic
O electromagnetic, weak, strong, gravitational
O gravitational, weak, electromagnetic, strong
O weak, electromagnetic, gravitational, strong
Answer:Helle dudes
Explanation:
im the Batman
Answer: C. gravitational, weak, electromagnetic, strong
Explanation:
Got it right!!
how does the number of protons change as atomic number increases by one
On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
this might be confusing but..
Explanation:
To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons. In the formula for determining mass based on weight, mass is measured in Newtons.
Do waves transfer or transport energy
Answer:
i think transport energy....but i'm not sure ...
Explanation:
A wave carries energy and momentum but does not carry matter: the particles vibrate around the equilibrium position but do not travel with the disturbance
Which of the following best explains Newton's Second Law? Answer A Masses accelerate, which generates forces. B The acceleration produced is a result of the force applied to a mass. C Forces are a result of the acceleration applied to a mass. D Objects with a constant rate of motion include those with a net force.
Answer:
B The acceleration produced is a result of the force applied to a mass.
Explanation:
The most fitting explanation for Newton's second law of motion is that acceleration produced is a result of the force applied.
Acceleration is the rate of change of velocity with time
Mass is the amount of matter in a substance
Force is the push or pull applied on a body to cause it to move
According to Newton's second law of motion:
"acceleration occurs when force is applied on a given mass";
Mathematically;
Force = mass x acceleration
Answer:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Explanation:
The gravitational force between two objects is F. If the mass of one of the two objects is tripled but nothing else has changed, what would the new force be in terms of F
A)F/9
B)6F
C)3F
D)F/3
Answer:
3F
Explanation:
Gravitational Force is directly proportional to the mass; thus if one mass is tripled then the force is triples as well.
How many temporal lobes are located in the brain?
Answer:
There's 1 temporal lobe that's located in the brain.
Explanation:
Answer: There are 4 lobes in the brain
Explanation:
A ball is thrown vertically upward at a 19.6m/s. For its complete trip, it's average speed is?
Answer:
The average velocity of an object is given by:
Average velocity = total displacement / total time
First, we calculate the time taken to reach the maximum height of the ball. This occurs when the final velocity is 0.
Vf = Vi + at
0 = 19.6 - 9.81 * t
t = 2 seconds
The total trip will be of 4 seconds (2 seconds up, 2 seconds down)
The total displacement is given by:
s = ut + 1/2 * at²
s = 19.6 * 2 - 0.5 * 9.81 * 2²
s = 19.6 meters
This is the distance maximum height, so the total height is
19.6 * 2 = 39.2 meters
Average velocity = 39.2 / 4
Average velocity = 9.8 m/s
Explanation:
Hope this helped!
Happy Halloween!
In the “Little Prince,” the Prince visits a small asteroid called B612. If the asteroid has a radius of 20.0 m and a mass of 2.00 x 10^4kg, what is the acceleration due to gravity on the asteroid (G=6.67x10-11N m2/kg2)?
Answer:
[tex]g= 3.33\times 10^{-9}\ m/s^2[/tex]
Explanation:
Given that,
The mas of asteroid is [tex]2\times 10^4\ kg[/tex]
The radius of asteroid is 20 m
We need to find the acceleration due to gravity on the asteroid. The formula for this is given by :
[tex]g=\dfrac{GM}{r^2}[/tex]
Where G is universal gravitational constant
[tex]g=\dfrac{6.67\times 10^{-11}\times 2\times 10^4}{(20)^2}\\\\g=3.33\times 10^{-9}\ m/s^2[/tex]
So, the acceleration due to gravity on the asteroid is [tex]3.33\times 10^{-9}\ m/s^2[/tex].
A tire is dragged behind a NON LIVING truck on the ground with a chain attached to the tire and the truck. what type of force is this?
Answer:
Kinetic Energy
Explanation:
If your talking about potential and kinetic energy then here's a example,
A hammer when raised up has potential energy (the energy of position or state) But when falling down has kinetic energy (the energy of motion)
How is ice more reflective than water?
Answer:
In fact, ice is slightly less reflective than water. The reflectivity is related to the refractive index (in a rather complicated way) and the refractive index of ice is 1.31 while the refractive index of water is 1.33. The slightly lower refractive index of ice will cause a slightly lower reflectivity. In both cases, the reflectivity is about 0.05 i.e. at an air/water or air/ice surface about 5% of the light is reflected.
Explanation:
Answer:
In fact ice is slightly less reflective than water. ... The net result is that much more of the light is reflected from snow. So the difference isn't anything fundamental, it's just because water is continuous while snow isn't.
hope it will help u
plz follow me
h. “Pujan's living with her husband now."
Sujata said ..... change into indirect reporting. plz send me fast so urgent
Sujata said that Pujan was living with her husband then
Answer:
sujata said that pujan was living with her husband
Silver is a white metal that is an excellent conductor. Silver tarnishes when exposed to air and light. The density of silver is 10.49 g/cm3. The melting point is 962oC and the boiling point is 2000oC. A chemical property of silver is A) density. B) melting point. C) tarnishes in air. D) that it is a conductor.
Answer:
C) tarnishes in air.
Explanation:
Silver is a white metal that tarnishes when it is exposed to air that has the presence of sulphur gases. When exposed, it begins to undergo discoloration. It starts to darken as a result of the reaction with the gases causing the silver object to be disfigured. The commonest sulphur containing gas is hydrogen sulfide. As relative humidity goes up, silver can also tarnish faster.
A blue car is traveling at a rate of 20 m/s. A red car is traveling at a rate of 40 m/s. The cars have equal masses.
Compare the kinetic energy of the two cars.
In 1978, Geoff Capes of the United Kingdom won a competition for throwing 5 lb bricks; he threw one brick a distance of 44.0 m. Suppose the brick left Capes' hand at an angle of 45.0° with respect to the horizontal a. What was the initial speed of the brick? b. What was the maximum height reached by the brick?
Answer:
A) 20.8 m/s
B) h_max = 11 m
Explanation:
A) Formula for projectile range is;
R = (u²sin2θ)/g
We want to find initial velocity, so let's make u the subject.
u = Rg/sin2θ
We are given;
R = 44 m
θ = 45°
Thus;
u = √[(44 × 9.8)/sin 2(45)]
u = √[431.2/sin 90]
u = 20.77 m/s ≈ 20.8 m/s
B) maximum height will be gotten from the formula;
h_max = (R tan θ)/4
h_max = (44 × tan 45)/4
h_max = (44 × 1)/4
h_max = 11 m
Help me please!!!!!!........
Answer:
i. A is converging lens B is diverging lens
ii. if the lens is thicker at it's center than its edge it is called converging lens and
if the lens is thinner at it's center than its edge it is called diverging lens. (thicker and thinner)
III. lensA
it said to be positive focal length
it always produce an upright image
lensB
it said to be negative focal length
it produce an upright image if the object is located in front of the focal point
2. example of lens A
plane mirror
convex mirror
example of lens B
concave mirror
Glasses
Answer:
[tex]question \:1. i. \\ \\ \boxed {A} \: is \: a \: \boxed{converging} \: lens \\ while \\ \boxed {B}\: is \: a \: \boxed{diverging} \: lens, \\ \\ question \:1. ii. \\ \\ \boxed {A} \:is \: a \: \boxed{converging} \: lens \: because \: i \: was \: able \: to \: identify \: \\ that \:A's \: center \: is \: ticker \: than \: it's \: edge.
\\ while\\ \boxed {B} \:is \: a \: \boxed{diverging} \: lens \: because \: i \: was \: able \: to \: identify \: \\ that \:B's \: center \: is \: thinner \: than \: it's \: edge. \\ \\ question \:1.i ii. \\ \\ \boxed {A} \:as \: a \: \boxed{converging} \: lens \: is \: curved \: outward \: and \: has \: an \: oval \: shape.
\\ while \\ \boxed {B} \:as \: a \: \boxed{diverging} \: lens \: is \: curved \: inwards. \\ \\ question \: 2. \\ \\ rainbow : \\ in \: the \: rainbow \: effect \: the \: concept \: of \: the \: refraction \\ \: of \: the \: sun's \: light \: rays \: as \: it \: enter \: the \\ \: rain \: (that \: causes \: the \: effect : rainbow) \: is \: an \: example. \\ another \: one \: is : \\ bent \: object : \\ the \: appearance \: of \: bent \: objects \: like \: pen \: or \: any \\ \: object \:inside \: a \: glass \: of \: water \: is \: due \: to \: refraction.[/tex]
Explanation:
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