Answer:
The deceleration is [tex]a = -0.7273 \ m/s^2[/tex]
Explanation:
From the question we are told that
The distance of the car from the crossing is [tex]d = 360 \ m[/tex]
The speed is [tex]u = 16 \ m/s[/tex]
The reaction time of the engineer is [tex]t = 0.53 \ s[/tex]
Generally the distance covered during the reaction time is
[tex]d_r = u * t[/tex]
=> [tex]d_r = 16 * 0.53[/tex]
=> [tex]d_r = 8.48 \ m[/tex]
Generally distance of the car from the crossing after the engineer reacts is
[tex]D = d- d_r[/tex]
=> [tex]D = 360 - 8.48[/tex]
=> [tex]D = 352 \ m[/tex]
Generally from kinematic equation
[tex]v^2 = u^2 + 2as[/tex]
Here v is the final velocity of the car which is 0 m/s
So
[tex]0^2 = 16^2 + 2 * a * 352[/tex]
=> [tex]a = -0.7273 \ m/s^2[/tex]
Earth is 1.5 ✕ 1011 m from the Sun. Neptune is 4.5 ✕ 1012 m from the Sun. How does the gravitational field of the Sun on Neptune (gSN) compare to the gravitational field of the Sun on Earth (gSE)?
Answer:
The gravitational field of the Sun on Earth is greater than the gravitational field of the Sun on Neptune.
Explanation:
From Newton's law of universal gravitation,
F = [tex]\frac{GMm}{R^{2} }[/tex] ............. 1
where F is the force, G is the gravitational constant, M is the mass of the bigger object, m is the mass of the smaller object and R is the distance between their centers.
Also, Newton's second law of motion state;
F = mg ................ 2
where F is the force, m is the mass and g is the gravitational force.
Equating 1 and 2,
mg = [tex]\frac{GMm}{R^{2} }[/tex]
⇒ g = [tex]\frac{GM}{R^{2} }[/tex]
Given that the distance between the Sun and Earth is 1.5 x [tex]10^{11}[/tex] m, then the gravitational field of the Sun on Earth,
gSE = [tex]\frac{GM}{(1.5*10^{11}) ^{2} }[/tex]
= [tex]\frac{GM}{2.25*10^{22} }[/tex] .................. 3
Given that the distance between the Sun and Neptune is 4.5 x [tex]10^{12}[/tex] m, then the gravitational field of the Sun on Neptune,
gSN = [tex]\frac{GM}{(4.5*10^{12}) ^{2} }[/tex]
= [tex]\frac{GM}{2.025*10^{25} }[/tex] ............. 4
Comparing equations 3 and 4, it can be observed that gSE > gSN.
The gravitational field of the Sun on Earth is greater than the gravitational field of the Sun on Neptune.
Kayla and her friends are setting up chairs for a school play each row will contain the same number of chairs Kayla knows that there are 96 chairs and all she wants there to be eight rows Kayla needs to know how many chairs, c, should be in each row. Which equation represents the situation. Which equation represents the situation
There are a total of 12 chairs in each row, and the scenario is represented by the equation 8c = 96.
What is algebraic Expression?Any mathematical statement that includes numbers, variables, and an arithmetic operation between them is known as an expression or algebraic expression. In the phrase 4m + 5, for instance, the terms 4m and 5 are separated from the variable m by the arithmetic sign +.
Given, there are 96 chairs and all Kayla wants there to be eight rows.
Let "c" be the number of chairs in each row,
Since there is a total of 96 chairs and 8 rows.
The equation for the situation is:
8 *c = 96
So,
In 8 rows there are a total number of chairs = 96
In each row, there are a total number of chairs = 96/8
In each row, there are a total number of chairs = 12
Therefore, the equation that represents the situation is 8c = 96 and there is a total of 12 chairs in each row.
Learn more about algebraic Expression here:
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The S.T.O.P strategy is useful for situations involving negative peer pressure
A: True
B: False
Answer:
(A.) it is true
Explanation:
the stop strategy
1. State the situation or problem.
2.Tell the person what you want.
3.Offer an opportunity to respond.
4.Provide closure (review, summary, or thanks).
could help you explain the situation to your peer
Kepler-186f is an exoplanet that orbits a star other than the Sun. Its star is the red dwarf Kepler-186. It is the first planet to be discovered that orbits its star at a distance like Earth’s distance from the Sun. If Kepler-186f is approximately 5.4 x 1010 meters from Kepler-186, how long does it take for light from the star to reach the exoplanet? The speed of light is 3.0 x 108 m/s. It takes 3 minutes
Answer:
t = 180 s = 3 minutes
Explanation:
The formula for the uniform speed of any object or element is given as:
V = S/t
t = S/V
where,
S = Distance between star and exoplanet = 5.4 x 10¹⁰ m
V = Speed of the light = 3 x 10⁸ m/s
Therefore, using these values in the equation, we get:
t = (5.4 x 10¹⁰ m)/(3 x 10⁸ m/s)
t = 180 s = 3 minutes
Hence, the light must reach the exoplanet in 3 minutes.
In a car engine, what type of energy is released at a high level, leading to inefficiency?
A. Mechanical
B. Electrical
C. Chemical
D. Thermal
car sitting on a drive way is that an kinetic or potential energy
Answer:
kinetic energy..........
Which of the following would result in the biggest INCREASE in erosion by a river
What is the velocity of a wave that has a wavelength of 20 meters and frequency of 0.5
Hz?
Answer:
v = 10 m/s
Explanation:
recall that velocity is related to wavelength and frequency by the formula
v = fλ
where v = velocity, f = frequency and λ= wavelength
Simply substitute these into the formula:
v = fλ
v = (0.5)(20)
v = 10 m/s
the answer will b bc grass hopppers cant swin
Answer:
ya thats right they cant swim
Explanation:
what does interval training involve
Answer:
Interval training is simply alternating short bursts (about 30 seconds) of intense activity with longer intervals (about 1 to 2 minutes) of less intense activity. For instance, if your exercise is walking and you're in good shape, you might add short bursts of jogging into your regular brisk walks.
Explanation:
Answer:
Interval training is simply alternating short bursts (about 30 seconds) of intense activity with longer intervals (about 1 to 2 minutes) of less intense activity. For instance, if your exercise is walking and you're in good shape, you might add short bursts of jogging into your regular brisk walks
Explanation:
A rocket has a mass of 80,000 kg and accelerates at a rate of 35 m/s2. Calculate the force that provides this acceleration.
The amount of force that provides an acceleration of 35m/s² with a mass of 80,000kg is 2,800,000N.
HOW TO CALCULATE FORCE:
The force applied on an object can be calculated by multiplying the mass of the object by its acceleration. That is;Force (N) = mass (kg) × acceleration (m/s²)According to this question, a rocket has a mass of 80,000 kg and accelerates at a rate of 35 m/s². The force can be calculated as follows:F = 80,000kg × 35m/s²F = 2,800,000NTherefore, the amount of force that provides an acceleration of 35m/s² with a mass of 80,000kg is 2,800,000N.Learn more at: https://brainly.com/question/20207503?referrer=searchResults
The transfer of heat by the movement of a fluid is called: Think about it: Imagine a pocket of air over the land (“land air”), and another pocket of air over the ocean (“ocean air”).
Which air pocket would you expect to heat up more during the day?
Why?
Answer:
The transfer of heat by the movement of fluid is called Convection Heat Transfer
Explanation:
Heat transfer by convection is the transfer of heat by fluid transport from one place to another, such that convection takes place when the heat that comes in contact of fluid containing body is moved to other parts of the container by the transporting fluid
Heat is transferred within a fluid medium mainly by convection (movement of heat by the transfer of fluid particles in the medium)
Convection heat transfer is a combination of conduction and advection heat transfer
Jupiter is made of gas(like Saturn, Uranus and Neptune). What would happen to the strength of gravity if you
a) moved away from Jupiter
b)Fell in to Jupiter
PLS HELP ME OMG ITS DUE TOMOROW AND I HAVE NO CLUE WHAT TO DO BEST EXPLANATION GETS BRAINLIEST
Answer:
a) The strength of gravity decreases if one moved away from Jupiter
b) The strength of gravity increases if one fell into Jupiter
Explanation:
The gravitational attraction is given by Newton law of gravitation as follows;
[tex]Force \ (strength) \ of \ gravity = \dfrac{G \times M \times m}{R^2}[/tex]
Where;
G = The universal gravitational constant = 6.67408 × 10⁻¹¹ m³/(kg·s²)
M = The mass of Jupiter
m = The mass of the nearby body
R = The distance between the centers of Jupiter and the body
From the equation, we have that the gravitational strength varies inversely with the square of the separation distance between two bodies
Therefore, as one moves away, R increases, and the strength of gravity reduces
Similarly as the body falls into Jupiter, R, reduces the gravitational strength increases.
The other name for 'net force' is 'unbalanced force'. What is the name of the force that could be applied to an object that would balance a net force and create a state of equilibrium?
Answer:
Friction
Explanation:
This is because friction tends to oppose the motion of an object. Since the unbalance force or net force causes a motion of the object, the frictional force would tend to oppose the object until it is large enough to balance the net force. When this is done, equilibrium is achieved.
At this instance, there is no net force acting on the object.
So, the forces on the object become balanced and in a state of equilibrium.
(AKS 3al) Which graph best represents a moving object in a state of equilibrium
Graph 1
Graph 3
Graph 2
Graph 4
A. Graph 4
o
B. Graph 2
O C. Graph 3
D. Graph 1
PLEASE HELP!! ILL MARK BRAINLYEST!!
MORE THAN ONE
When an acid and a base are mixed, the excess ions:
A. combine to form water
B. increase
C. decrease
D. neutralize each other
Answer:
decrease and neutralize each other
Explanation:
if an earthquake has a velocity of 41 m/s and a wavelength of 225 meters.
what is the earthquakes frequency?
Answer:
Frequency = 5.49Hz
Explanation:
Given the following data
Velocity = 41m/s
Wavelength = 225m
[tex] Velocity = wavelength * frequency [/tex]
Making frequency the subject of formula, we have;
[tex] Frequency = \frac {wavelength}{velocity} [/tex]
Substituting into the equation, we have;
[tex] Frequency = \frac {225}{41} [/tex]
Frequency = 5.49Hz
Therefore, the frequency of the earthquake is 5.49 Hertz.
A place Or object used for comparison to determine if something is in motion is called a what?
Answer:
[tex] \boxed{ \bold{ \sf{Reference \: point}}}[/tex]
A place or object used for comparison to determine if something is in motion is called a reference point .
✎ Explanation :
A reference point can be defined as a fixed point / place / object from which we compare the motion of an object. For example :
When we are travelling by bus , we are in motion with respect to a nearby tree. Here , the tree acts as a reference point or reference frame.Hope I helped!
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8) A block of lead has dimensions of 4.50 cm by 5.20 cm by 6.00 cm. The block weighs 1587 g. From this information, calculate the density of lead.
9) 28.5 g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark, from this information, calculate the density of iron.
10) What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3.
Answer:
[tex]11.3\ \text{g/cm}^3[/tex]
[tex]7.92\ \text{g/cm}^3[/tex]
[tex]238.1\ \text{cm}^3[/tex]
Explanation:
8) Volume of lead
[tex]V=4.5\times 5.2\times 6\\\Rightarrow V=140.4\ \text{cm}^3[/tex]
m = Mass of block = 1587 g
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{1587}{140.4}\\\Rightarrow \rho=11.3\ \text{g/cm}^3[/tex]
Density of lead is [tex]11.3\ \text{g/cm}^3[/tex]
9) Volume of lead = Volume of water displaced = (49.1-45.5) = 3.6 mL = [tex]3.6\ \text{cm}^3[/tex]
m = Mass of iron = 28.5 g
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{28.5}{3.6}\\\Rightarrow \rho=7.92\ \text{g/cm}^3[/tex]
The density of iron is [tex]7.92\ \text{g/cm}^3[/tex]
10) m = Mass of silver = 2500 g
[tex]\rho[/tex] = Density of silver = [tex]10.5\ \text{g/cm}^3[/tex]
Volume is given by
[tex]V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{2500}{10.5}\\\Rightarrow V=238.1\ \text{cm}^3[/tex]
The volume of silver is [tex]238.1\ \text{cm}^3[/tex]
HELP ASAP!!!
The development of the periodic table created predictable trends. What trend
does electronegativity follow?
Answer:
electronegativity increases from left to right
Explanation:
took quiz
A paint can is sitting on a ladder 20 m high. It has a mass of 7 kg. What is the
potential energy of the paint can?
Answer:
The answer is 1400 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
PE = 20 × 10 × 7
We have the final answer as
1400 JHope this helps you
Which one has greater potential energy? An 8 kg rock sitting on a 2.2 m cliff or a 6 kg rock sitting on a 3.2 m cliff.
Answer: The 6 kg rock sitting on a 3.2 m cliff.
Explanation:
The potential energy of an object of mass M that is at a height H above the ground us:
U = M*H*g
where g is the gravitational acceleration:
g = 9.8m/s^2
Then:
"An 8 kg rock sitting on a 2.2 m cliff"
M = 8kg
H = 2.2m
U = 8kg*2.2m*9.8 m/s^2 = 172.48 J
"a 6 kg rock sitting on a 3.2 m cliff"
M = 6kg
H = 3.2m
U = 6kg*3.2m*9.8m/s^2 = 188.16 J
You can see that the 6kg rock on a 3.2m cliff has a larger potential energy.
What is the gravitational constant g?
Answer: In SI units, G has the value 6.67 × 10-11 Newtons kg-2 m2. The direction of the force is in a straight line between the two bodies and is attractive. Thus, an apple falls from a tree because it feels the gravitational force of the Earth and is therefore subject to “gravity”.
Explanation:
If you throw your annoying little sister down the stairs with a force of 60 N and she weighs 30 kg. What’s her acceleration rate?
Depends on what units you are using but
0.028196 gravitational acceleration on earth
0.2765 meters per second squared
0.9072 feet per second squared
3 points
14. Even though the water in a filled bathtub may be at the same
temperature as water in a teacup, the water in the bathtub has more
because it contains a greater number of water
molecules.
Choose
convection
kinetic energy
thermal energy
potential
temperature
Page 3 of 4
Answer:
Potential
Explanation:
The water in the bathtub has more potential energy than that in the tea cup because it has a greater number of water molecules.
Mass is a parameter that is very instrumental in determining potential energy.
The potential energy of a body is the energy due to the position of that body.
Potential energy = mass x acceleration due gravity x height
Mass is the amount of matter in a substance. Water in the tub will have more mass and contain a greater number of water molecules there in.
Since potential energy is directly proportional to mass, then, it will have a greater amount of potential energy.
Which layer cools with height and also has the earths weather in it
A the Troposphere
B The stratosphere
C The thermosphere
D the Mesosphere
Answer:
A) Troposphere
Explanation:
It is the lowest layer of the earth's atmosphere.
WILL GIVE BRAINLIEST
Answer:
The boat will go faster.
Explanation:
A .422 kg coffee mug rests on a table top 0.63 m above the floor. What is the potential energy of the mug with respect to the floor?
Answer:
2.61 J
Explanation:
Since potential energy U = mgy where m = mass of object, g = acceleration due to gravity = 9.8 m/s² and y = height of object above the ground.
Now for the coffee mug, m= 0.422 kg and it is 0.63 m on a table, so it is 0.63 m above the ground. Thus, y = 0.63 m.
We compute U
U = mgy
= 0.422 kg × 9.8 m/s² × 0.63 m
= 2.605 J
≅ 2.61 J
So, the potential energy of the mug with respect to the floor is 2.61 J
Are the small sized gears only force, speed and distance, only speed
Please help me..........
Answer:
2nd one Force
Explanation:
Without a source of force and object won't have the capability of moving.
Answer:
force
Explanation:
pushing something forward