The efficiency of the steam engine is 78.9%.
What is the efficiency of a machine?The efficiency of a machine is a measure of the useful work done by the machine as against the work input into the machine.
Efficiency of a machine = work output/work input × 100%Work output of the steam engine = 225 K
Work input of the steam engine = 285 K
The efficiency of the machine = 225/275 × 100% = 78.9%
Therefore, the efficiency of the steam engine is 78.9%.
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Microscopes are used to study the structures of rocks. Over time, microscopes have become more and more powerful.
As a result of this technological improvement, our structural information of rocks
As a result this technological improvement, our structural information of rocks has improved greatly.
What is a petrographic microscope?A petrographic microscope is a type of optical microscope that is used to identify rocks and minerals in very thin sections and also to investigate microscopic textures and features that are present in minerals and rocks.
This has improved greatly recent structural information about rocks.
Hence, microscopes used in the study of structures of rocks has overtime improved greatly our structural information about them
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Answer:
B is the correct answer.
Explanation:
sketch an electric field pattern around two identical negative point charges shown below in the figure of class 11 model question physics.
Answer:
fv nfv f n f vjrkfv frnv thrfn htrfn vt
Explanation:
v ntv tfrv tn vtv jr4v t5o vtv tv tv
Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts is______ newtons.
Answer:
65
Explanation:
a conveyor belt at a recycling plant launches bottles and bottle caps into the air, so that an automatic image recognition device can count them. They land same height at which they are launched. Glass bottles are launched at an angle of 35.0 degrees above horizontal and land after 0.500 seconds.
a) Solve for the initial speed at which the bottles are launched.
b) Solve for the horizontal displacement at which the bottle land
(a) The initial speed at which the bottles are launched is 4.27 m/s.
(b) The horizontal displacement at which the bottle land is 1.75 m.
Initial speed of the bottleThe initial speed of the bottle is calculated as follows;
[tex]T = \frac{2usin\theta}{g}[/tex]
where;
T is time of flightu is the initial speed2usinθ = Tg
u = Tg/(2sinθ)
u = (0.5 x 9.8)/(2 x sin35)
u = 4.27 m/s
Horizontal displacement of the bottleX = u²sin(2θ)/g
X = (4.27² x sin(70))/(9.8)
X = 1.75 m
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An aircraft lands and brakes, slowing from 250 m/s to 5 m/s in 30 secs. What is it's acceleration?
O-10 m/s²
-8.2 m/s²
-1.3 m/s²
-5.2 m/s²
The acceleration of the aircraft is determined as -8.2 m/s².
Acceleration of the aircraft
The acceleration of the aircraft is calculated as follows;
a = Δv/t
where;
Δv is change in velocityt is timea = (5 - 250)/(30)
a = -8.2 m/s²
Thus, the acceleration of the aircraft is determined as -8.2 m/s².
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4) A force of 100 N is applied to the wrapped present, giving it an
acceleration of 2 m/s2. What is the mass of the object?
Please help me nowwww!!!!!!!!
Answer:
50kg
Explanation:
Force = 100N
Acceleration = 2 m/s2
Mass = ?
From formula,
Force = Mass * Acceleration
100 = Mass * 2
Mass = 50 kg
Hence ,mass of object is 50 kg.
In short,Force(F) = 100N
Acceleration(a) = 2 m/s2
Mass(m) = ?
We know,
F = ma
100 = m x 2
m = 100/2
m = 50kg
Hence ,mass of object is 50 kg.
Answer:
50 kg
Explanation:
Force(F) = 100N
Acceleration(a) = 2 m/s2
Mass(m) = ?
We know,
F = ma
100 = m x 2
m = 50kg
hence ,mass is 50 kg.
What constant acceleration, in SI units, must a car have to go from zero to 30 m/s in 14 s ?
Express your answer with the appropriate units.
Answer:
Acceleration = 2.143m/s²
Explanation:
Vf=Vi+at
(30)=(0)+a(14)
a=2.143m/s²
Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (Box after the "10" in answer is for the exponent.). ∙ 10 .
The result of 9 ∙ 10-⁵ divided by 3 ∙ 10-⁹ is 3 × 10⁴. Details about exponential functions can be found below.
How to calculate multiplication involving exponentiation?Exponentiation is the process of calculating a power by multiplying together a number of equal factors, where the exponent specifies the number of factors to multiply.
According to this question, the following exponential function is given:
9 × 10-⁵ ÷ 3 × 10-⁹
9/3 × 10-⁵+⁹
3 × 10⁴
Therefore, the result of 9 ∙ 10-⁵ divided by 3 ∙ 10-⁹ is 3 × 10⁴.
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Describe 2 health and safety risks at the scene and how can you dealt with this.
The two Health and safety risk at the scene are:
1. To deal with Chemicals.
2. To deal with Electricity.
What are Healthy and safety risk?The healthy and safety risk at the scene or office is described as safety hazards that has to be taken when employers are working in office in some mechanical or electrical workshops.
Employers need to e follow some healthy and safety risk while working in office like:
1. Chemicals : When employees have to handle harmful or dangerous chemicals as part of their work. To safety safe the must wear protective clothing.
2. Electrics - Electrical safety is an important issue in workplace , especially where there is a risk that heavy-duty equipment might cause electric shock.
These are some safety hazards employees must follow.
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An object of volume 2.0×10⁴cm³ is under water .calculate the buoyant force of water on the object (Density of water=1000kg/m³)
Answer:
An object of volume 2.0×10⁴cm³ is under water .calculate the buoyant force of water on the object (Density of water=1000kg/m³) 196.2N
Discuss the role of oxygen in air supply aboard spacecraft, such as the ISS.
When living beings require energy, they require oxygen for breathing. The form in which oxygen is released back into the environment is carbon dioxide.
What is spacecraft?A vehicle built for use outside the atmosphere of the planet.
In pressurized tanks located outside the airlock of the station, the ISS gets a regular supply of oxygen from the planet.
These aren't enough to keep the station stocked for a long time, but they are plenty to keep topping the tank off because there are occasionally leaks.
Hydrogen and carbon dioxide combine to form biomass when oxygen is released into the environment.
Living beings need oxygen for breathing when they require energy. Carbon dioxide is the form in which oxygen is released back into the atmosphere.
Hence, oxygen is a must in the air supply aboard spacecraft,
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Mr smith needs to put the paving stone dosnt to rest his arms. He does not want the paving stone to sink deep into the mud . Explain which surface of the stone he should put on the ground.
The surface of the stone which he should put on the ground is the base.
What is a Base?This is defined as the flat end which is usually located at the bottom with a larger surface area.
The large surface area helps to distribute the forces on all parts thereby preventing it from sinking.
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What happens to sound waves from an object as it moves toward you?
The pitch gets higher because of an increase in wavelength.
The pitch gets lower because of an increase in frequency.
The pitch gets lower because of an increase in wavelength.
The pitch gets higher because of an increase in frequency.
The event that happens to sound waves from an object as it moves toward you is The pitch gets higher because of an increase in wavelength.
What is sound waves?Sound waves refer to a form of transverse wave that compress and vibrate while travelling from one medium to another thereby transferring energy.
Therefore, The event that happens to sound waves from an object as it moves toward you is The pitch gets higher because of an increase in wavelength.
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Marc and Linh stretch out a long spring on the classroom floor. Marc holds one end of the spring still. Linh creates waves in the spring by moving the other end right and left with a frequency of 2 Hz. If wave crests are 0.5 m apart, what is the speed of the waves?
The speed of the wave created by Linh in the spring by moving the other end right and left with a frequency of 2 Hz is 1m/s.
How to calculate speed of a wave?The speed of a wave can be calculated by using the following formula:
Speed = Wavelength x Frequency
According to this question, Linh creates waves in the spring by moving the other end right and left with a frequency of 2 Hz. If wave crests are 0.5 m apart, the speed can be calculated as follows:
speed = 2Hz × 0.5m
speed = 1m/s
Therefore, the speed of the wave created by Linh in the spring by moving the other end right and left with a frequency of 2 Hz is 1m/s.
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A block with mass m = 2 kg slides down from a friction less ramp (mu = 0). If the angle theta is 25 degrees, find the acceleration of the block.
Based on the calculations, the acceleration of this block as it slides down from the friction less ramp is equal to 0.85 m/s².
How to determine the acceleration of the block?In order to determine the acceleration of this block, we would apply Newton's Second Law of Motion while taking moment about the tensional force.
The vertical component of the tensional force that is acting on the block as it slides down from this friction less ramp is given by:
T = Ma - Mgsinθ
0 = Ma - Mgsinθ
Ma = Mgsinθ
a = gsinθ
Substituting the given parameters into the formula, we have;
a = 9.8 × sin25
a = 9.8 × 0.4226
Acceleration, a = 0.85 m/s².
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anxious to the point that he couldn't eat very well without his stomach feeling queasy. As a result of his stress, Jonah increased his time of practicing basketball and asked an old team member to help him develop new skills he needed in order to make the team. After hearing that he made the basketball team a day after tryouts, Jonah went out for a large pizza with the rest of the team players.
Based on this information, a psychologist would most likely conclude that Jonah's stress __________.
Based on this information, a psychologist would most likely conclude that Jonah's stress led him toward positive personal changes.
What is stress?When a person is afraid or tensed about something, he overthinks about him and become stressed.
Anxious to the point that he couldn't eat very well without his stomach feeling queasy. As a result of his stress, Jonah increased his time of practicing basketball and asked an old team member to help him develop new skills he needed in order to make the team. After hearing that he made the basketball team a day after tryouts, Jonah went out for a large pizza with the rest of the team players.
As, he is feeling good, he wants to celebrate himself. So, he went to eat pizza with his team players. This shows that he is not stressed but happy.
Thus, ,this information depicts that Jonah's stress led him toward positive personal changes.
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4.2 a horizontal force of 4 400 N, acting to the right, is applied on a car of mass 1000kg on horizontal surface. the surface exert a frictional force of magnitude 800 N on the car
4.2.1 Draw a force diagram showing all the force acting on a car
Answer:
three properties of intrinsic semiconductor
A 0.250 kg block attached to a light spring oscillates on a frictionless, horizontal table. The oscillation amplitude is A = 0.125 m and the block moves at 3.00 m/s as it passes through equilibrium at x = 0. (a) Find the spring constant, k.
The spring constant, k will be 18 N/m.The ratio of force to one unit of displaced length is known as the spring constant.
What is the spring constant?Spring constant is defined as the ratio of force per unit displaced length.
Given data;
Mass of block,m=0.250 k
Amplitude,A = 0.125 m
Velocity,V=3.00 m/
Spring constant,K=?
The formula for the spring constant when the spring is oscillate at the given amplitude A:
[tex]\rm K = \frac{V_{max}^2 m}{A} \\\\ K = \frac{3.0 \times 0.250}{0.125} \\\\ K=18 \ N/m[/tex]
Hence, the spring constant, k will be 18 N/m
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A type of anchor that is a good choice when jacking or leveling
the fastening component is a(n)_
Select one:
O a. wedge anchor
O b. stud bolt anchor
O c. one-piece anchor
O d. hammer-set anchors
A type of anchor that is a good choice when jacking or leveling the fastening component is a stud bolt anchor.
What is a Stud bolt anchor?
These are the type of anchor which bare embedded in concrete with the threaded portion on the outside.
This makes it easier to jack or level the fastening component which is why option B was chosen.
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How many dogs can cross at one
A pump is used to lift 100 KG of water from a wel 60 m deep,in 20 S If force of gravity on 1 KG is 10 N,find
a) work done by the pump
B) potential energy stored in the water
c)power spent by the pump
d)power rating of the pump
Explanation:
Given,
m = 100 kgg = 10 N/kg¹h = 60 mt = 20 sTo Find:
a) Work done by the pump
b) Potential energy stored in the water
c)Power spent by the pump
d)Power rating of the pump.
Solution:
a) Work done by the pumpWe know that,
[tex] \rm \: Work \: done = Force * Distance \: moved[/tex]
f = 100 kg * 10N/kgd = 60 m[tex] \rm \: Work\; Done =(100 \: kg \times \cfrac{10N}{kg} ) \times 60 \: m[/tex]
[tex] \rm \: Work\; Done =1000 \times 60 \: joule[/tex]
[tex] \boxed{\rm \: Work\; Done =60000 \: joule}[/tex]
[The unit'll be joule since N×M = J]
b) Potential energy stored in the water[tex] \rm \: P.E = m \cdot g \cdot h[/tex]
m = 100 kgg = 10N/kgh = 60[tex] \rm \: P.E =100 \:kg \: \times \cfrac{10 \: N}{kg} \times 60[/tex]
[tex] \boxed{\rm \: P.E =60000 \: joule}[/tex]
same condition here as well, N×M = Jc) Power of the Pump[tex] \rm \: P = W/T[/tex]
where P = Power; W = Work done & T = Time takenAs we got the value of work done on question (a),& ATQ time taken is 20 S.
[tex] \rm \: P = \cfrac{60000 \: joule}{20 \: seconds} =\boxed{\rm { 3000 \: Watts }}\: or \: \boxed{\rm 3 \: kW}[/tex]
d) Power rating of the pump = 3 kWAssumption: The pump is 100% efficient & works well.
An object is placed at 0 on a number line. It moves 3 units to the right, then 4 units to the left, and then 6 units to the
right. What is the displacement of the object?
1
5
7
13
Answer: 5
Explanation: If you use a real graph it could be easier to check, but here’s it the easy way.
You start at 0, add 3 as you are going right on the right , subtract 4 as you are going left, then again add 6 as you are going right, and you should get 5.
0+3= 3
3-4= -1
-1+6= 5
A cross country skier moves 32 m north, then 65 m south, and finally 16 m north. What is the distance? What is the displacement ?
The distance and Displacement travelled by skier is 17m and 16 m
What is Distance and Displacement?Distance is the length of the actual path taken by object.
Displacement is the shortest distance between the initial and final position.
The SI unit of both distance and displacements is meter (m).
In this case,
Distance = 32m - 65m + 16 m
= 17 m
Here ,
Displacement = Initial position - Final position
= 32m -16m = 16m
Hence , The distance and displacement of the skier are 17m and 16m.
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A car travels 263.0 miles in 5.5 hours. How long will it take to travel 363.0 miles at
this average velocity? (Answer to 1 decimal place)
From the average velocity calculated, if the car should travel 363.0 miles, the time elapsed will be 7.6 hours.
How long will it take to travel 363.0 miles at the given average velocity?Note that; Velocity is the speed at which an object moves in a particular direction. It is expressed as;
v = distance / time
Given that;
Distance covered by the car d = 263.0 milesTime elapsed t = 5.5 hoursFirst we determine the velocity of the car.
v = distance / time
v = 263.0 miles / 5.5 hours
v = 47.8181 miles per hour.
Now, if the car travels 363.0 miles, time elapsed will be;
velocity = distance / time
time = distance / velocity
time = 363.0 miles / 47.8181 miles per hour
time = 7.6 hours
Therefore, from the average velocity calculated, if the car should travel 363.0 miles, the time elapsed will be 7.6 hours.
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Two point charge
q, seperated by 1.5cm
have change value
of +2.0 and -4.0N/C
respectively what is
the magnitude of the
Electric force midway
between them?
Answer:
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