Answer:
P = W / t = m g s / t = m g v where work by auto = m g s
30 kw = 30000 watts = 30000 J / s
Work wasted = F v as shown above relating work and power
Work done against incline = m g s sin 8.75 and power against incline
= m g v sin 8.75 = 1222 v Joules / sec
power in moving auto = power available - power lost to friction
power in moving auto = 30000 - resistance = 30000 - 910 v
1222 v = 30000 - 910 v
v = 30000 / 2132 = 14 m/s
Note: constant resistance to motion must mean P = W / t = F s / t = F v
Maximum speed will be v = 14.07 m/s
What is power ?Power is defined time rate of doing work or delivering energy.
Work done = Force * displacement
Power = work done / time
= (Force * displacement ) / time
since , displacement / time = velocity
Power = force * (displacement / time ) = force * velocity
Power = mass * acceleration * velocity ( as force = mass * acceleration)
since , car is travelling up in an incline of 8.75° to the horizontal
hence , it will have two components of velocity
vertical component = v sin (theta ) = v sin(8.75°)
horizontal component = v cos (theta)= v cos (8.75°)
Power = m* a * v sin (theta )
= 820 * 9.8 * v *sin (8.75°) ( a = g = 9.8 m[tex]/s^{2}[/tex])
= 1221.472 v
Power lost due to resistance in motion = 910 * velocity = 910 v
Power = Total power - power lost due to resistance in motion
= 30 * [tex]10^{3}[/tex] - 910 v
30 * [tex]10^{3}[/tex] - 910 v = 1221.472 v
v = 14.07 m/s
Maximum speed will be v = 14.07 m/s
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A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is
(a) 0.5 Wb
(b) 12.5 Wb
(c) zero
(d) 2 Wb
We know
[tex]\boxed{\sf Magnetic\:flux=\O=BA}[/tex]
[tex]\\ \qquad\quad\sf{:}\dashrightarrow \O=5(2.5)[/tex]
[tex]\\ \qquad\quad\sf{:}\dashrightarrow \O=12.5Wb[/tex]
Explanation:
Magnetic flux = L I
= 5(2.5)
= 12.5 Wb
(b) 12.5 Wb
200 Kg Car Travelling at 10m/s hits a tree and is brought to rest in 0.10s.What is the magnitude of average force acting on the car to bring it to rest?
Please find attached photograph for your answer. Please do comment whether it is useful or not.
what are the occupational respiratory disorders?
Answer:
the occupational respiratory disorders are the one that occur
due to long term inhalation of chemical proteins and dust and it affects respiration badly.
Explanation:
Occupational respiratory disease is any lung condition you get at work. It occues because of repeated exposure to certain toxins. You can even get a disease long after being exposed to those toxins. Certain workplaces lend themselves to disease.Physics help please
Answer:
what's your question?
Explanation:
I'm standby to answering your question.
The bulb in the circuit shown in figure does not glow. Why? Redraw the circuit diagram by making necessary change in it so that the bulb glows.
Answer:The bulb did not glow as the switch is not turned on which obstructs electric current to flow through it. Also, the battery in the figure has both terminals as positive. It should be one negative terminal and one positive terminal.Redrawn diagram is also given
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More
What four things
are required for photosynthesis?
Explanation:
carbon dioxide, chlorophyll, water and light
Any measure that shows the central tendency or variation in a sample is called
I think the answer is averages.
Answer:
averages.
Explanation:
The term central tendency dates from the late 1920s. The most common measures of central tendency are the arithmetic mean, the median, and the mode.
John took 0.75 hours to bicycle to his grandmother's house, a distance of 4 km. What is his velocity?
What are you solving for?
What’s the equation?
Show work!
Help pleaseee!
Answer:
5.3Km/hr
Explanation:
Velocity=Displacement/Time
D=4km;T=0.75hr
V=4/0.75=5.33..
John traveled at a speed of 5.3 km/h to get to his grandmother's house.
How is the rate of position change in relation to time measured?While velocity is the rate of change of an object's position with respect to time in a specific direction, speed is the rate of change of an object's position with respect to time overall. The speed of an item moving in a certain direction is referred to as its velocity. When there is a change in speed, direction, or both, the velocity also changes.
Given:
Time taken to travel, t = 0.75 h
Total distance travelled = 4 km
Let's imagine that John traveled to his grandmother's house in a single direction at a constant pace.
Velocity = Distance travelled in a given direction/Time
So, Velocity = 4 km/0.75 h = 5.3 ≈ 5km/h
John's speed in getting to his grandmother's residence was thus 5 km/h.
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A body weighs 63N on the surface of the earth . What is the gravitational force on it due to the earth at height of 3200km from the earth surface ?Radius of the earth is6400
Answer:
Weight of the body,W=63 N
Acceleration due to gravity at height h from the Earths surface is given by the relation:
g ′ = (1+ R e h ) 2 g
Substituting h=R e /2, g ′ =4g/9
Weight of body of mass m at height h is given as: W ′ =mg ′
=4/9 mg
=4/9×63=28 N
7 (a) Use the kinetic particle theory of matter to explain why energy is needed to melt a solid, at its melting point, to form a liquid. - [2] (b) A student puts a drop of coloured ink into water. The ink slowly spreads throughout the water. Use the kinetic particle theory of matter to explain this observation.
Answer:
7 (a).
» At melting point, temperature is constant and there is increase in vibràtory energy of solid molecules increases. In that case, the mobílity or lovomotive degree of the solid molecules because the intermolecular forces between them have became weaker. Hence molecules become further apart from each other hence a liquid formed.
(b).
The molecules of the ink get bonded to the water molecules. Since water molecules have a high degree of mobílity or locomotion in different directions, the ink molecules also tend to move in different directions hence water turns colored.
Explanation:
[tex].[/tex]
The temperature remains constant and solid molecular vibrantion energy rises near the melting point. In that circumstance, the mobility or locomotive degree of the solid molecules has decreased as a result of the weakening of the intermolecular interactions. As a result of the molecules growing further apart, a liquid was created.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
The mobility or locomotive degree of the solid molecules has decreased as a result of the weakening of the intermolecular interactions. As a result of the molecules growing further apart, a liquid was created.
The ink molecules form bonds with the water droplets. Liquid changes color because of the ink molecules' propensity to migrate in distinct ways due to the great degree of mobility or motility that water droplets have.
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What are the phenomena that physics is applied in?
Answer:
Physics is applied every where? For example if you talking with you friends, that mean the sound that you produce oscillate through your friends' ear so he/ she can respond to you.
Explanation:
Physics is the fundamental unit about understanding the world around us.
There are several phenomena in our day-to-day life from the formation of the rainbow to the free falling of objects under the influence of gravity physics is applied almost everywhere.
What is science?Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.
Physics is a useful tool for seeing the real world, which is far larger than we can imagine. In every conceivable way, it describes the environment we live in. Almost all human activities, including walking, eating, and listening to music, require physics. Everywhere we look, there is physics.
In daily life, we encounter a number of events, such as the rainbow's emergence and items falling freely as a result of gravity. Nearly everywhere uses physics.
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1.Name any two part of a flower?
2.write SI unit and fundamental unit of force, power and volume?
Explanation:
s.i unit of force is kgm/s²
dimensions of force is ML/T²
s.i unit of power kgm²/s³
dimension of power is ML²/T³
s.i unit of volume is m³
the dimension of volume is L³
fill the blank spaces with suitable terms a heat energy from bottom
to the top of atake is
A car traveling south is 200 kilometers from its starting point after 2 hours what is the a
Answer:
[tex]\huge\boxed{\sf a = 100\ kmh^{-2}}[/tex]
Explanation:
Given Data:
Distance = 200 km
Initial Velocity = Vi = 0 m/s
Time = 2 hours
Required:
Acceleration = a = ?
Formula:
2nd equation of motion
Solution:
[tex]\displaystyle S = Vit+\frac{1}{2} at^2\\\\200 = (0)(2)+\frac{1}{2} a(2)^2\\\\200 = \frac{1}{2} a (4)\\\\200 = 2a\\\\Divide\ both\ sides\ by\ 2\\\\200/2 = a\\\\a = 100\ kmh^{-2}\\\\\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Peace!time taken by a train of length 150 m and travelling with uniform velocity of 60km/hr to cross completely a bridge of length 1.5km will be
Answer:
Time=0.0275h ,you can change it into sec by multiplying it by 3600
Explanation:
SEE THE IMAGE FOR SOLUTION
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what are the newtons law and their formulas
Answer:
Newton's second law of motion states that the acceleration ( a) experienced by an object is directly proportional to the net force ( Fnet) experienced by the object and inversely proportional to the mass of the object. In equation form, it could be said that a = Fnet/m. The net force is the vector sum of all the individual force values.
Explanation:
At time t=0 a car has a velociry of 16m/s. it slows down with an acceleration given by -0.5t, in m/s² for t in seconds. it stops at t =? A.64s. B.32s. C.16s. D.8s. E.4s.
Answer:
The answer is D.8s
Explanation:
We know,
[tex]a=\frac{dv}{dt} \\=>adt=dv\\\\=>-0.5tdt=vdt ;[a=-0.5t][/tex].......(i)
For, t = 0, v = 16 ms⁻¹
t = x, v = 0 ms⁻¹;(the car stops)
Now, Definite integral for equation (i),
[tex]\int\limits^x_0 {-0.5t} \, dt=\int\limits^0_16{dx}[/tex] ;[the lower limit will be 16 but I don't know why this is not working]
[tex]=>-0.5(\frac{x^2}{2}-0)=-16\\[/tex]
∴[tex]x=8s[/tex]
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What topic name does this equation go into in physics? [tex]d = v_{i} t + \frac{1}{2}at^{2}[/tex]
Answer: 9+3.5 m/52
Explanation:d=vit + 1/2 at2
d=0 + 1/2 -2 at2
d2/+2=A
a=(28m)/40.52
When astronauts get on a rocket and go outside Earth they float because gravity is affected by this
Answer:
Distance
Explanation:
Gravity is indirectly related to distance. This means if distance increases, gravitational pull decreases.
Energy sources used today are mostly in what form of energy?
Select one:
O a.
electrical
O b. chemical
O c. nuclear
O d. radiant
Answer:
I think it is A. electrical.
Explanation:
I believe it is A, because most people today have phones and IOT use a phone, it has to be charged, and IOT charge a phone you have to use an outlet which uses electrical energy.
We have that the Energy sources used today are mostly in electrical form as the are required in the most accepts of living.
Option A
From the Question we are Given
a. electrical
b. chemical
c. nuclear
d. radiant
Generally all energy sources listed below are all good sources of energy and a very reliable
But the Energy sources used today are mostly in electrical form as the are required in the most accepts of living.
Therefore
The correct option is Option A
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calculate the total resustance
Circut 2ohmls, 2Ohlms
In parrelle
Explanation:
total resistance=(2×2)/(2+2)= 1ohms
Three masses are in a swimming pool filled with water (density 1000 kg/m). All three objects are identical in size (400 cm) but have different densities. Object A floats on the water (density 580 kg/m3), Object B is completely submerged underwater but has a density equal to that of water, and Object C sinks to the bottom (density 3700 kg/m?).
Compare the magnitude of the buoyant force on each block:
a. Fa = FB = Fc
b. FA
c. FA >FB = Fc
d. Fa
e. FA > FB > Fc
Answer:
FA < FB = FC
Explanation:
The buoyant force is equal to the weight of the displaced water.
The two that sink displace the same amount of water and therefore have the same buoyant force. The one that floats displaces less than its full volume of water and therefore has a lower buoyant force. Its buoyant force will equal its weight.
You do not have an answer option for the correct solution.
if you think that Horoscopes are Science or Pseudo-Science and give your reason
Answer:
Pseudo science
Explanation:
Astrology has not demonstrated its effectiveness in controlled studies and has no scientific validity, and is thus regarded as pseudoscience.
Explain why refraction of light waves occurs
Answer:
As light waves transmit from one medium to another medium ( of different optical densities ), the speed of the light wave changes. When speed changes the direction of the wave changes hence refracted.
[tex].[/tex]
Which feature of a heating curve indicates a change of state
Answer:
The diagonal or the inclined lines shows the changes in terms of temperature, and the horizontal lines shows the changing of phases.
Explanation:
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9.1 x 105 – 7.2 x 105
=
Answer:
1.9 x 10⁵
Explanation:
I ASSUME your question is supposed to read
9.1 x 10⁵ – 7.2 x 10⁵ =
9.1 - 7.2 = 1.9 and the powers are the same so just tag them along
its the same as
910000 - 720000 = 190000
1.9 x 105 could be another possibility if the question is actually posed correctly.
What is the mass of a body? How is it measured?
The mass of a body is a measure of its inertial property or how much matter it contains.
Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and adult women. To determine BMI, weight in kilograms is divided by height in meters, squared
Mass is both a property of a physical body and a measure of its resistance to acceleration (rate of change of velocity with respect to time) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.
How is it measured?Mass is measured in kilogram.
What is used to measure it?To measure mass, we usually use a balance. In the lab, mass may be measured with a triple beam balance or an electronic balance. But an old fashioned beam balance gives the most accurate value.
Hope it helps you... pls mark brainliest if it helps youExtra Practice In Exercises 1-4, use the diagram. 1. Give two other names for CD.
Answer: I think it’s point cd and line cd
Explanation:
Denial cycled at 6 mph for 0.8 h. Then he jogged at 2 mph for
1.2 hours. What was Denial's average speed for the total
distance?
mph
Average speed is difined as the total distance travelled divided by the total time required to cover the distance. Mathematically, it is expressed as:
[tex]Ave. Speed = \frac{Total distance }{Total time}[/tex]
To obtain the average speed of Daniel, we shall determine the distance travelled in each case. This is illustrated below:
Case 1:Speed 1 (S₁) = 6 mph
Time 1 (t₁) = 0.8 h.
Distance 1 (D₁) =?[tex]Speed = \frac{Distance}{Time} \\\\S_{1} = \frac{D_{1}}{t_{1}} \\\\6 = \frac{D_{1}}{0.8}[/tex]
Cross multiply
D₁ = 6 × 0.8
D₁ = 4.8 mileCase 2:Speed 2 (S₂) = 2 mph
Time 2 (t₂) = 1.2 h.
Distance 2 (D₂) =?[tex]S_{2} = \frac{D_{2}}{t_{2}}\\\\2 = \frac{D_{2}}{1.2}[/tex]
Cross multiply
D₂ = 2 × 1.2
D₂ = 2.4 mileNext, we shall determine the total time. This can be obtained as follow:
Time 1 (t₁) = 0.8 h.
Time 2 (t₂) = 1.2 h.
Total time (T) =?T = t₁ + t₂
T = 0.8 + 1.2
T = 2 hNext, we shall determine the total distance. This can be obtained as follow:
Distance 1 (D₁) = 4.8 mile
Distance 2 (D₂) = 2.4 mile
Total distance (D) =?D = D₁ + D₂
D = 4.8 + 2.4
D = 7.2 mileFinally, we shall determine the average speed of Daniel. This can be obtained as follow:
Total time = 2 h
Total distance = 7.2 mile
Average speed =?[tex]Ave. speed = \frac{Total distance }{Total time} \\\\Ave. speed = \frac{7.2 }{2}[/tex]
Average speed = 3.6 mphTherefore, the average speed of Daniel is 3.6 mph
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What is the density of a substance that has a volume of 14 milliliters and a mass of 13.2 grams
Answer:
Below
Explanation:
You can use this formula to find the density of something
density = mass / volume
Plugging our values in.....
density = 13.2 / 14
density = 0.9428571429 g/mL
Rounding to sig figs we get....
density = 0.94 g/mL
Hope this helps! Best of luck <3
Answer:
[tex]\huge\boxed{\sf Density = 0.94\ g/mL}[/tex]
Explanation:
Given:
Volume = 14 mL
Mass = 13.2 g
Required:
Density = ?
Formula:
Density = Mass / Volume
Solution:
Density = 13.2 / 14
Density = 0.94 g/mL
[tex]\rule[225]{225}{2}[/tex]
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