Answer:
Static Friction-Friction that acts when the two objects are not moving
Sliding Friction-Two solid surfaces slide across each other
Rolling Friction-An object rolls across each other
Fluid Friction-Friction that occurs as an object moves through a fluid
Explanation:
a vessel containing water is kept on an oven. the temperature of water increases as heat is supplied to it from the oven. But the temperature stops rising when the water begins to boil. What is the reason for this? where does the heat go then?
Answer:
See the answer below
Explanation:
The temperature stops rising when water begins to boil because the heat which causes the rise in temperature is now diverted into changing the phase of the boiling water.
The conversion of substances from one state of matter to another requires energy. Hence, instead of causing a rise in the temperature of the boiling water, the heat is used to convert the liquid water into vapor. The heat thus becomes what is known as the latent heat of vaporization.
What are some of the payoffs
companies receive when offering child care
benefits to employees?
Answer:
Some of the payoffs companies receive when offering child care benefits to employees;
1) Employees are proud to tell others they work for such establishments which make the establishment attractive to talents
2) Reduced attrition for work place policy
3) Increased loyalty of the employees to the companies mission
4) Workers are less likely to take work appointment in other places
5) Child care offering are some of the aspects workers consider when searching for jobs
6) Companies can enjoy tax breaks
Explanation:
A sprinter starts their race from the 0 position and reaches their constant velocity of 8.7 m/s when they are at 32 meters in the from the starting line. How far from the starting line will the sprinter be if they continue at the speed for 5 more seconds?
Given : Initial speed , u = 0 m/s .
Final speed , v = 8.7 m/s .
Distance travelled , d = 32 m .
To Find : How far from the starting line will the sprinter be if they continue at the speed for 5 more seconds .
Solution :
It is given that after reaching speed of 8.7 m/s speed become constant .
So , distance covered in 5 second is :
[tex]d=v \times t\\d=8.7 \times 5 \ m\\d=43.5 \ m[/tex]
Now , total distance from start line is :
[tex]D=32+43.5=75.5 \ m[/tex]
Therefore , the distance from starting line is 75.5 m .
Hence , this is the required solution .
what is the mass calculate it if the weight of a body is 420 N .
Answer:m=42kg
Explanation:
wieght = mass × gram
420 = mass × 10
therefore , answer is 42
Answer:
[tex]\huge \boxed{\mathrm{42 \ kg} }[/tex]
Explanation:
[tex]\sf Weight \ (N) = mass \ (kg) \times acceleration \ of \ gravity \ (m/s^2)[/tex]
[tex]\sf W=m \times g[/tex]
We know that the acceleration of gravity on the Earth is approximately 10 m/s.
The weight of the body is given 420 N.
[tex]\sf 420=m \times 10[/tex]
Solve for the mass. Divide both sides by 10.
[tex]\sf m = 42[/tex]
The mass of the body is 42 kg.
A total of 233 electrons pass a point in a circuit in 45 minutes. What is the current?
.1 nano ampere
Explanation:
I= Q flow/ t in secs
I= 233/2700
I= 0.0862e/sec
I= 0.0862/6.25 * 10^8 ( ampere conversion)
I= 0.1 nano ampere .
This diver has just jumped up from the end of the diving board. After she dives down and is falling toward the water, she’ll have kinetic energy, or the energy of moving matter. But even as she is momentarily stopped high above the water, she has energy. Do you know why?
Answer:
Mechanical energy is divided into two:Kinetic energy and Potential energy....The diver diving down exhibits kinetic energy because she is moving but when she has stopped it means she has potential energy which means that a body is at rest....
A student recorded the favorite dipping sauces of the 70 people in his class. He wants to plot these data in a circle graph:
What angle should the wedge for barbecue have?
A.103
B.28.5
C.75
D.206
Explanation:
There are 70 people in a class. A student wants to plot these data in a circle.
We need to find the angle should the wedge for barbecue have.
There are 20 such students that like barbecue.
So,
[tex]B=\dfrac{20}{70}\times 360^{\circ}\\\\B=102.85^{\circ}[/tex]
or
B = 103°
It means that 103° on the circle shows the number of students that like barbecue .
Scientists want to place a telescope on the moon to improve their view of distant planets. The telescope weighs 200 pounds on Earth. What will happen to the weight of the telescope when it reaches the moon? The weight of the telescope will increase. The weight of the telescope will decrease. The weight of the telescope will stay the same. The weight of the telescope will be equal to its mass.
Answer:
Explanation:
the weight of the telescope decreases because the moon attract the body with less force as compared to earth due to less gravity as compared to earth
When Scientists want to place a telescope on the moon to improve their view of distant planets. The telescope weighs 200 pounds on Earth. then The weight of the telescope will decrease. therefore the correct answer is option B.
What is gravity?It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another, The gravity varies according to the mass and size of the body for example the force of gravity on the moon is the 1/6th times of the force of gravity on the earth.
Thus, when scientists attempt to mount a telescope on the moon in order to get a better view of far-off planets. 200 pounds are the telescope's weight on earth weight. The telescope's weight will then decrease. So, choice B is the right response.
Learn more about gravity from here
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what is optical fibre
Answer:
Optical Fiber is a wired communication medium. It is made using one or many thin strands of glass or plastic.
Explanation:
Fiber optics is used in communications, medicine, optical inspection, lighting and in the making of sensors.
• A flame always points upwards. Why do you think this is so?
(HINT: Gases produced in a flame are hot, and hence lighter.)
Answer:
A flame always point upwards because the flame's gas is hotter than the surrounding air and, like you said, a hot gas is always lighter or less dense than a cold gas.
Explanation:
A feather and a marble are released from a height of 10 m at the same time. Why will the marble reach the ground first
Answer:
air resistance slows the feather
Explanation:
give two application for newton's first law of motion in our daily life
Answer:
1.A driver of automobile brakes abruptly and, by inertia, shoots forward.
2. A stone in the ground is in a state of rest
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Engineers often build a prototype perfectly. It is rare that they have to improve their product.
True or false
Answer:
false
Explanation:
most prototypes are and perfect and they are build to find our mistakes
Radio waves of frequency 1.667 GHzGHz arrive at two telescopes that are connected by a computer to perform interferometry. One portion of the same wave front travels 1.260 mm farther than the other before the two signals are combined.
Required:
a. Will the two waves combine constructively or destructively?
b. Calculate the value of m for the path difference between the two signals
Explanation:
The frequency of radio waves is 1.667 GHz
One portion of the same wave front travels 1.260 mm farther than the other before the two signals are combined.
There are two conditions for interference either constructive or destructive.
For constructive interference , the path difference is n times of wavelength and for destructive interference, the path difference is (n+1/2) times of wavelength
We can find wavelength in this case as follows :
[tex]\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{1.667\times 10^9}\\\\\lambda=0.1799\ m[/tex]
If we divide path difference by wavelength,
[tex]\dfrac{\delta}{\lambda} =\dfrac{1.26}{0.1799}\\\\\dfrac{\delta}{\lambda} =7\\\\\delta =7\lambda[/tex]
It means that the path difference is 7 times of the wavelength. it means the two waves combine constructively and the value of m for the path difference between the two signals is 7.
the speed of a rollar coaster could be measured in
Answer:
pe=mgh
Explanation:
hope this helped
HELP ME PLEASE If an object is placed under a force of 20 N, it accelerates at a rate of 5 m/s^2. If the force is increased to 55 N, what is the new acceleration? a 13.75 kg b 7.25 kg c 21.10 kg d 5.65 kg
Answer:
b
Explanation:
Answer:13.75
Explanation:
solve the equation below for vi.
d=vit +.5at2
Answer: [tex]\dfrac{d-0.5at^2}{t}=v_i[/tex]
Explanation:
[tex]d=v_it+0.5at^2\\\\\\\text{Subtract}\ 0.5at^2\ \text {from both sides:}\\d-0.5at^2=v_it\\\\\\\text{Divide both sides by t:}\\\dfrac{d-0.5at^2}{t}=v_i[/tex]
Which statement describes the motion of an object with a net force is zero
Answer:
The object is at rest.
Explanation:
It's basically what the other person said, but written a different way.
The item is at a standstill.
If there is no net force acting on an item, its velocity will stay unchanged. Either the thing is at rest with no velocity or it is moving in a single direction at a constant pace.
The First Law says that an item having a net force of zero operating on it will either remain stationary or maintain the current velocity if it is initially at rest. If a spring is extended, it must feel equal but opposite forces at both ends if it is to stay still.
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A boy kicks a ball with a mass of 5 kg so that it accelerates at 4 m/s2 in the forward direction.
A 40 N
B 0 N
C 20 N backward
D 20 N forward
A ball tossed at an angle of 40° with the horizontal will go as far downrange as one tossed at the same speed at an angle of
Answer:
50°
Explanation:
Projectiles launched at complementary angles have the same range.
an object at a distance of 6400km from the centre
the earth weights 50 Newton
what will be its weight if
it is shifted to 12800 km from the center of the earth?
Answer:
12.5N
Explanation:
From newton law of universal gravitation F= GmM/d2.
that means Force is inversely proportional to the square of the distance apart.
F1= 50N, d1=6400km
F2=?, d2=12800km
F1/F2=d2×d2/d1×d1 so we have 50/F2= 12800×12800/6400×6400...F2=6400×6400×50/(12800×12800)=12.5N
When you step into a very full bath or hot tub, sometimes the water overflows. But when you step into a lake and swim, you don't notice the level of the water rise at all. Explain why this is.
Answer:
This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow
_______ is a vector quantity; ________ is a scalar quantity.
Question 4 options:
speed...displacement
displacement...velocity
mass...velocity
velocity...distance
Answer: Velocity...Distance
Explanation: Velocity is a vector quantity as it has both magnitude and direction
Distance is a scalar quantity as it has only magnitude and no direction
hope this helped...
A metal in group 17 of the periodic table can become a chemically stable ion by A. losing one electron. B. gaining one electron. C. gaining two electrons. D. losing two electrons.
Answer:
A. losing one electron
Hope this helps :)
Answer:
The correct answer is "Gaining one electron".Explanation:
I just solved this question.The volume of air is 53.28 m 3 . Convert it into scientific notation. 5.328×101 m3 532.8×101 m3 0.5328×103 m3 Both A and C
Explanation:
It is given that, the volume of air is 53.28 m³. We need to convert it into scientific notation.
Any number in scientific notation can be given by :
[tex]N=a\times 10^b[/tex]
a is real no and b is any integer
We have, V = 53.28 m³
To write it into scientific notation, shift decimal before 3 such that,
[tex]V=\dfrac{5328}{100}[/tex]
No multiply and divide by 10. So,
[tex]V=\dfrac{5328}{100}\times \dfrac{10}{10}\\\\V=\dfrac{5328}{1000}\times 10\\\\V=5.328\times 10^1\ m^3[/tex]
So, the correct option is (a).
If x2 = 60, what is the value of x? plus or minus square root 30 plus or minus square root 60 ±30 ±120
SciTech needs to hire an engineer to develop a prototype for a project. The company asks each engineer to provide a cost and time estimate for the work. Each bid is shown in the table.
Which engineer would be the most cost-effective for the project?
Camilla
John
Nora
Oracio
Answer:
Oracio
Explanation:
Mutiply the cost per hour by the time to complete the job
Camila 40x20=800
John 30x30= 900
Nora 20x40=800
Oracio 15x50=750
The Oracio engineer would be the most cost-effective for the project.
The calculation is as follows:Here we Mutiply the cost per hour by the time to complete the job
So,
Camila 40(20)=800
John 30(30)= 900
Nora 20(40)=800
Oracio 15(50)=750
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nc-1 has the same dimension as
Answer:
Explanation:
The answer is electric field intensity. Electric field intensity is the force per unit positive charge which the charge exerts at any point.
A) The army has acquired radar that can track an artillery shell in flight and determine its origin before it hits. The system erects a sensitive electronic plane over a broad area and can detect any projectile piercing that plane. After tracking the shell and plotting its path, system's computer back tracks the trajectory to the firing location. The enemy has fired a shell at the radar station. The radar detects the shell at the coordinates (400 m, 75 m) and again at (200 m, 50 m). Given that the path of a projectile projected near the surface of the earth is a parabolic, determine (i) the angle of projection of the shell and (ii) the initial velocity of projection.
Answer:
i) angle of projection = 17.4⁰
ii) initial velocity = 131.2 m/s
Explanation:
To determine the angle of projection and initial velocity of projection we have to apply the projectile path equation
where : Vi = initial velocity , g = acceleration due to gravity , ∅ = angle of projection
attached below is the detailed solution of the problem above
does friction always oppose relative motion?
Answer:
Yes
Explanation:
Friction is a force that opposes relative motion between systems in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other.