Answers
Answer:
Explanation:
The equation for acceleration is
[tex]a=\frac{v_f-v_0}{t}[/tex] which is the final velocity minus the initial velocity divided by the time. I first need to put the units all in the same terms. We have the velocity given as km/hr, but the time is given in seconds and that's not gonna work. I will change the velocity to km/sec:
[tex]90\frac{km}{hr}*\frac{1hr}{3600s}=.025\frac{km}{s}[/tex] That's the value we will use for the final velocity of this car in the equation for acceleration:
[tex]a=\frac{.025-0}{10}=.0025\frac{km}{s^2}[/tex]
The second part of this problem asks how far the car travels in this 10 seconds. We just determined that the car can travel .025 km in 1 second, so in 10 seconds the car travels 10(.025) = .25 km
Related Questions
is a corroding metal a physical or chemical change?
Answers
Answer:
Coording metal is a physical change.
The substance is undergoing a specific chemical change as when Iron combines with oxygen to form iron oxide which is the chemical name of rust. Or what occurs when metal corrodes
What are the two groups of planets based on composition?
Answers
whats the beginning of life called
Answers
Answer:
Abiogenesis in evolutionary science, not sure about creation science
Explanation:
a sphere of diameter 6.0
cm is moulded into a thin wire of diameter 0.2 mm calculate the length of the wire in metres
Answers
Answer:
V1 = 4/3 pi R^3 = pi D^3 / 6 D = 2 R volume of sphere
V2 = pi r^2 L = pi d^2 L / 4 volume of wire
V2 / V1 = 1 = 3/2 d^2 L / D^3 since volumes are equal
L = 2/3 D^3 / d^2 = 2/3 * 6^3 / .02^2 = 360,00 cm = 3600 m
a loaf of bread has a mass of 2000g and a volume of 500 cm3. what is the density of the bread
Answers
Answer:
4g/cm^3
Explanation:
density = mass / volume
= 2000 / 500
= 4g/cm^3
Why does a small piece of steel rod sinks while a large steel oil tanker floats?
Plss help thanks! pls include EXPLANATION and EXAMPLES that I can proof to people that has no knowledge
Answers
Answer:
Too what i know its because of the air
Explanation:
The steel rod is more dense and doesnt have air whil'st the oil tanker is less dense with lots of air
A 111 kg linebacker running at 1.9 m/s and a 82 kg quarterback running at 3 m/s have a head-on collision in midair. The linebacker grabs and holds onto the quarterback. (a) What is their combined speed immediately after the collision
Answers
Answer:
Explanation:
mass of linebacker, m = 111 kg
initial velocity, u = 1.9 m/s
mass of quarterback, m' = 82 kg
initial velocity, u' = 3 m/s
(a) Let they are moving in the same direction, the velocity is v after collision.
Use conservation of momentum
m u + m' u' = (m + m') v
111 x 1.9 + 82 x 3 = (111 + 82) v
v = 2.4 m/s
Let they are moving in opposite direction, the velocity is v after collision.
Use conservation of momentum
m u - m' u' = (m + m') v
111 x 1.9 - 82 x 3 = (111 + 82) v
v = - 0.18 m/s
Exercise b) 1) Fill in the blanks with the appropriate word: a) The pressure exerted by the air in atmosphere is called b) Pressure is the applied per unit area, c) The pressure ........as the depth of liquid increases. d) The SI unit of density is Az object fisats on water if the ...of the object is leva
Answers
Answer:
atmospheric pressure
b)
c)increases
d) ....
A 4000 N force acts on an object that initially has a momentum of 400 kg-m/s for 0.9 seconds. What is the final momentum of the system?
Answers
Answer:
4360 Kgm/s
Explanation:
Applying,
Ft = M-M'................. Equation 1
Where F = force, t = time, M = Final momentum, M' = Initial momentum.
make M the subject of the equation
M = Ft+M'............ Equation 2
From the question,
Given: F = 4000 N, t = 0.9 seconds, M' = 400 kg-m/s
Substitute these values into equation 2
M = 4000+(0.9×400)
M = 4000+360
M = 4360 kgm/s
Hence the final momentum is 4360 kgm/s
A city bus travels along its route from Jackson Street 8 km to Aurora Avenue, where it turns and continues 13 km.
What is the total distance that the bus has traveled? km
The total displacement of the bus is approximately 15 km northeast northwest southeast southwest.
Answers
im a bit confused on what the question is:(
if its just asking for the total number of km traveled it would be 21 km
Cho hai điện trở R1 = 12Ω và R2 = 18Ω được mắc nối tiếp nhau. Điện trở tương R12 của đoạn mạch có thể nhận giá trị nào trong các giá trị
Answers
Answer:
For two resistors R1 = 12Ω and R2 = 18Ω are connected in series. The equivalent resistance R12 of the circuit can take any of the values
What is Anatomy & Physiology in 5 words?
Answers
Answer:
Anatomy is the study of the structure and relationship between body parts.
Physiology is the study of the function of body parts and the body as a whole.
Explanation:
The mass of earth 6*10^24kg and radius is 400kg Now find the value of acceleration due to gravity when a object is 3600km from the earth surface
Answers
Answer:
Explanation:
the Earth is 6 xx 10^(24) kg and its radius is 6400 km. Find the acceleration due to gravity on the surface of the Earth. Updated On: 7-4-2021
state the advantages and disadvantages of alkaline battery over a lead acid accumulator
Answers
Answer:
Alkaline batteries have longer shelf life than other batteries of the chloride type electrolyte batteries. They have a much higher energy density compared with other batteries. This allows the battery to produce the same energy while lasting longer than other batteries.
Advantage
1) Alkaline battery lasts long than other batteries
2) It have a much higher energy density
Disadvantage :
1) They are heavier and bulkier
2) They have high internal resistance
What is alkaline battery ?An alkaline battery is a type of primary battery that derives its energy from the reaction between zinc metal and manganese dioxide.
Advantage
Alkaline battery can produce same amount of energy by lasting longer than other batteries as it have longer shelf life than lead acid accumulator
Alkaline battery have a much higher energy density compared to lead acid accumulator
Disadvantage :
Alkaline battery are heavier and bulkier
Alkaline battery have high internal resistance
learn more about Alkaline battery
https://brainly.com/question/12580609?referrer=searchResults
#SPJ2
A carnot engine has an efficiency of 50% when its sink temperature is 27°C. The temperature of source is: a) 300°C b) 327°C c) 273°C d) 373°C
Answers
327 degrees
Have a great day!
Answer the following questions 1 What is the difference between mass and weight of an object. Will the mass and weight of an object on the earth be same as their values on Mars ? Why?
Answers
Answer:
difference between mass and weight is that mass is amount of matter in a material while weight is a measure of how the force of gravity acts upon that mass.the mass of an object will be same on earth and mars but its weight on both planets will be different.
"Measurement is essential in our life. Justify the statement.
Answers
Explanation:
Measurement plays an important role in our daily lives because they are useful to do basic tasks, such as taking the temperature of a child with the help of a thermometer,making time estimations,measure out medicines and find out weights, areas and volumes of different substances
Which of these factors make hydrogen fuel cells a better option than burning fossil fuels?
-Hydrogen fuel cells have a higher energy efficiency.
-Hydrogen fuel cells create less pollution.
-Burning fossil fuels relies on outdated devices and technology.
-Hydrogen is the most abundant element in the universe.
-Hydrogen fuel cells are more expensive than fossil fuels.
Answers
Answer:
it the second answer
Explanation:
because burning fossils pollute the environment
what is required for force to come into play
Answers
Answer:
An interaction of one object with another object results in a force between the two objects. Thus, at-least two objects must interact for a force to come into play.
1.What is laser?
2.List the uses of laser in everyday life
Answers
Laser means Light Amplication by Stimulated Emission of Radiation.
Uses of laser
DNA sequencing instrument
Cutting and welding materials
Semiconducting chip manufacturing
Military devices
IF YOU LIKE MY ANSWER MARK AS BRAINLIEST
(1) A string of constant thickness and length I cm is stretched by a force of T Newton. A
tuning fork stamped 256 Hz sets the string vibrating at its fundamental frequency.
Find the frequency of the string when:
(i) Its length is doubled and the tension constant;
(ii) the tension is doubled and the length constant.
2) State the effect of increase in the tension on a wire on its frequency.
Answers
Answer:
Explanation:
i) frequency is the square root of the quotient of Tension over linear density/ all divided by two times the length.
linear density and tension are constant, so the numerator remains constant
The length is doubled, so the frequency is halved.
f = 128 Hz
ii) Doubling the tension increases the frequency by √2
f = 256√2 = 362 Hz
2) If other factors remain constant, increasing tension increases frequency.
A skier is standing still on a flat area of snow.
The weight of the skier is 550 N. The total area of his skis in contact with the ground is 0.015
m2.
What is the pressure exerted on the ground by the skier?
3700 N / m2
37 000 N/m2
8.3 N/m2
0.83 N/m2
Answers
We know
[tex]\boxed{\sf Pressure=\dfrac{Force}{Area}}[/tex]
[tex]\\ \sf\longmapsto Pressure=\dfrac{550}{0.015}[/tex]
[tex]\\ \sf\longmapsto Pressure=36666Pa[/tex]
[tex]\\ \sf\longmapsto Pressure=36666N/m^2[/tex]
Most nearest value is 37000N/m^2
Hence option b is correct
How does modulus of elasticity change with the rise of temperature
Answers
Explanation:
With rise in temperature, the length of the material increases which decreases its stiffness. Thus, we can say that with rise in the temperature, the Young's modulus decreases.
the slope of a line on a position vs time graph is the
a. velocity
b. time
c. distance
d. displacement
Answers
It's the velocity, but only the magnitude. It can't show the direction of the velocity. So it's better to call it speed.
Derived quantities depend on...........physical quantity
Answers
Derived quantities depend on.( fundamental)..........physical quantity
Are you from Nepal?
Answer:
Derived quantities depend on two or more physical quantity.
Is velocity ratio of a machine affected by applying oil on it?Explain with reason.
Answers
Answer:
It depends upon SAE No. of oil. (SAE means Society of Automotive Engineers). However, it usually does protect against friction.
Explanation:
If we use very viscous oil, it does not reach all the parts. Very thin oil will flows away easily and gets wasted. Grease is used in such cases. It is generally used around ball-bearing. Normal grease or oil is never used where there is high pressure, high temperature and high speed. Special lubricants are used in such cases. In cold season the oil becomes thick and in hot season it becomes thin. Therefore selection of lubrication also depends on the season. It is always advisable to refer operating manual of the equipment before selecting the lubricant.
The intensity of friction depends on following factors:
i) The area involved in friction.
ii) The pressure applied on the surfaces.
Force = Pressure ´ Area Frictional force will increase, if the area of contact will increase or if pressure applied on the surface increased.
where do we use friction in day to day life
Answers
Answer:
walking in ground
while playing carrom
A group of students are designing a field study to investigate the length of time a traffic light remains yellow.
Answers
Answer:
3 to 7 seconds.
Explanation:
According to the traffic engineers the length or the duration of the signal to turn form yellow or amber to green is more than 5 seconds. A time interval is needed to easy out the traffic flow.a teacher drives from school to the mall. then she goes to the doctors office for a physical examination. what is the magnitude of her displacement
Answers
The magnitude of the teachers displacement is the difference between
the location of the school and the location of the doctors office
The reason behind the above expression are explained as follows
The known locations of the teacher;
Initial location; The school
Second location; The mall
The eventual location; The doctors office
The required information;
The magnitude of the teachers displacement
The method of obtaining the displacement of the teacher;
Qualitatively, the displacement of the teacher can be obtained by applying the definition of displacement as follows;
The definition of displacement is an object's change in position, given by the difference between its start and finish locations
According to the definition of displacement, therefore, the magnitude of
the teachers displacement is the distance between the school and the
doctors office which is given by the difference between the coordinates of
the location of the school and the location of the doctors office
The magnitude of the displacement of the teacher = The coordinate of the location of the doctors office - The coordinate of the location of the school
Learn more about displacement here;
https://brainly.com/question/17587058
How can you say gravitational force is a field force
Answers
Answer:
because gravity pulled us in the land if there is no gravitational force there will not be field force too
Explanation:
hope it's will help you
