Answer:
It is necessary to search for new sources of energy because the sources we have now are non-renewable and exhaustible. The usage of these sources are increasing day by day and if this continues then one day we wlii be left with none so it is necessary to search for new sources of energy
PLEASE MARK ME BRAINLIEST
A car moves at 20 m s' for 15 minutes. Calculate the distance travelled
Explanation:
Calculating this according to the m/s rate
Now solving the question
If the car goes 20 m/s mathematically we can generate it as
15 × 60 = 600 secs
If the car goes 20 meters per every second it means
The car will go 20 meters for 900 secs
Which is 900 ×20 = 18000m/s
=18000÷1000 = 1km
Therefore the answer is 18km
atoms are composed of several basic types of very small ____; the ____ of each of these particles gives a different kinds of atoms so unique identity
Answer:
An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms combine to form molecules, which then interact to form solids, gases, or liquids. For example, water is composed of hydrogen and oxygen atoms that have combined to form water molecules. Many biological processes are devoted to breaking down molecules into their component atoms so they can be reassembled into a more useful molecule.
Atomic Particles
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Atoms have different properties based on the arrangement and number of their basic particles.
The hydrogen atom (H) contains only one proton, one electron, and no neutrons. This can be determined using the atomic number and the mass number of the element (see the concept on atomic numbers and mass numbers).
write two differences between practical machine and ideal machine
Answer:
Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done. So these are the differences between Ideal Machine and Practical Machines.
A force is applied to a box for 6.10s causing the 5.20kg box to come to accelerate from rest to 2.80m/s. What was the force on the box?
Explanation:
f = ma
m = 5.2kg
u = 0
V= 2.80m/s
t = 6.10s
a =(2.8- 0)/6.10
a = 2.8/6.10
a = 0.46m/s²
f = 5.2 X 0.46 =2.392N
f = 2.392N
when ideal gas is heated at constant pressure then P.E..
(a)decreases
(b)increases
(c)remains the same
(d)none of these
Answer:
B increases hope this is right
what is light emitting diode
Answer:
A light emitting diode (a semiconductor diode which glows when voltage is applied.
what is x-rays ? and how it's formed ?
X - rays are highly penetrating electromagnetic radiations that are formed when the cathode rays strikes a dense metal.
It has many characteristics such as :
bears no charge.travels with the speed of light.can ionize gases.An armadillo and Earth attract each other gravitationally. Which experiences the greater gravitational force, or do they experience the same force magnitude?
a. Same force magnitude
b. Earth
c. Armadillo
Answer:
a. Same force magnitude
Can y’all please help because my teacher didn’t really explain it to me
Answer:
8. Dinitrogen trioxide:
[tex]{ \sf{N_{2} O_{3}}}[/tex]
9. Nitrogen:
[tex]{ \sf{N}}[/tex]
10. Lithium oxide:
[tex]{ \sf{Li_{2}O}}[/tex]
11. Phosphorus trifluoride:
[tex]{ \sf{PF_{3} }}[/tex]
12. Vanadium oxide:
[tex]{ \sf{V_{2} O_{3} }}[/tex]
13. Silicon tetrafluoride:
[tex]{ \sf{SiF _{4}}}[/tex]
14. Sodium phosphide:
[tex]{ \sf{Na_{3} P}}[/tex]
A particle is projected from a point on a horizontal plane and has an initial velocity of 28root 3 m/s at an angle of 60 degree .find the greatest heights reached by the particle
Answer:
uujjjjjctc7tox7txr9ll8rz8lr5xl8r6l8dl85x8rl5x8rl5x8rl5xrx8l58rk5xr8l5xr6l8xr68lc
Mary finishes a marathon at a speed of 2 m/s. If her
acceleration period is 4 seconds, then what is her average
acceleration (in m/s?)?
Explanation:
v2 = v1 + at
v2 final speed
v1 initial speed
a acceleration
t time
2 = 0 + 4 a
a = 1/2
Help pls, see picture. Will mark Brainliest
Answer:
B
Explanation:
the graph shows the line going up (accelerating) and it isn't curving like d so it doesn't stop accelerating
Hope this helps :)
If a 0.8 kg object hanging from a spring stretches it by 0.55 m, then by how much will the spring be stretched (in m) if a 1.6 kg object is suspended from it?
if an object is accelerating at 4 m/s^2 and has a mass of 8 kg, what is the net
force (in newtons, N) on the object?
Answer:
The force applied is 32 N
Explanation:
F = ma
F = 8 × 4
F = 32 N
Answer:
[tex]\boxed {\boxed {\sf 32 \ Newtons}}[/tex]
Explanation:
We are asked to find the net force on an object. According to Newton's Second Law of Motion, force is the product of mass and acceleration. Therefore, the formula for calculating force is:
[tex]F= m \times a[/tex]
The mass of the object is 8 kilograms and its acceleration is 4 meters per second squared.
m= 8 kg a= 4 m/s²Substitute these values into the formula.
[tex]F= 8 \ kg \times 4 \ m/s^2[/tex]
Multiply.
[tex]F= 32 \ kg *m/s^2[/tex]
Convert the units. 1 kilogram meter per second squared is equal to 1 Newton. So, our answer of 32 kilogram meters per second squared is equal to 32 Newtons.
[tex]F= 32 \ N[/tex]
The net force on the object is 32 Newtons.
How much net force is required to accelerate a 10 kg mass at 1.5 m/s2?
Answer:
F = 15N
Explanation:
The explanation is on the above photo.
Object X is attracted to object Y. If object Y is negatively charged, what can you say about object X? (a) It is positively charged (b) It is negatively charged (c) It is electrically neutral (d) Object X may be positively charged, but it is possible it is also electrically neutral with an induced charge separation
Answer:
a) Object X is positively charged
Explanation:
Unlike charges attract each other
Like charges repel each other
The object X will be positively charged through charging by conduction.
The given parameters:
Object Y = positively chargeA charge can be produced by conduction. This method of charge generation involves charging a neutral body by placing it in contact charged body.
When object X is placed in contact with object Y, which is negatively charged, the negative charges of object Y repels negative charges of object X. This leaves object X with excess protons, thereby becoming positively charged.
Thus, the object X will be positively charged through charging by conduction.
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The heating element of an electric oven is designed to produce 3.9 kW of heat when connected to a 240-V source. What must be the resistance of the element?5)A 120-V hair dryer has two settings: 950 W and 1400 W .a) Determine the resistance at 950 W setting.b) Determine the resistance at 1400 W setting.
The heating element of an electric oven is designed to produce 3.9 kW of heat when connected to a 240-V source. Then the resistance of the element is 14.7Ω
When A 120-V hair dryer has two settings: 950 W and 1400 W then the resistance at 950 W is 15.15Ω and at 1400 W is 10.28Ω.
What is Electric Power ?The pace at which electrical energy is transmitted by an electric circuit is referred to as its power. The watt is the SI unit of power, equal to one joule per second. Watts, like other SI units, have standard prefixes: thousands, millions, and billions of watts are referred to as kilowatts, megawatts, and gigawatts, respectively.
It is a popular misperception that electric power is purchased and sold, whereas electrical energy is. Electricity, for example, is sold to users in kilowatt-hours (kilowatts multiplied by hours), because energy is defined as power multiplied by time.
In this problem,
Given,
Power P = 3.9 KW
Voltage V = 240 V
P = V²/R
3.9 × 10³ = 240²/R
R = 240²/3.9 × 10³
R = 14.7Ω
For hair dryer,
given,
P = 950 W or 1400 W
V = 120 V
P = V²/R
950 = 120²/R
R = 120²/950
R = 15.15Ω
P = V²/R
1400= 120²/R
R = 120²/1400
R = 10.28Ω
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If mass is measured in kg and acceleration is measured in m/s^2, what units would force be measured in? This unit is also know as a newton (N).
Using Newtons second law
[tex]\\ \sf\longmapsto Force=Mass\times Acceleration[/tex]
[tex]\\ \sf\longmapsto Force=kgm/s^2[/tex]
[tex]\\ \sf\longmapsto Force=Newton(N)[/tex]
efficincy of simple machine is 60% what does it mean?
Explanation:
By the statement, Efficiency of a machine is 60% it is meant that 'The work output is 60% of the work input'. If you apply 100J of energy for a machine, it will be able to life load of 60 J only
A car slows down from 27.7 m/s
to 10.9 m/s in 2.37 s.
What is its acceleration?
Answer:
- 7.088 m/s²
Explanation:
As we know that,
★ Acceleration = Change in velocity/Time
→ a = (v - u)/t
Here,
Initial velocity (u) = 27.7 m/sFinal velocity (v) = 10.9 m/s→ a = (10.9 m/s - 27.7 m/s)/2.37 s
→ a = -16.8/2.37 m/s²
→ a = -7.088 m/s² [Answer]
Negative sign denotes that the velocity is decreasing.
Answer:
[tex]\boxed {\boxed {\sf -7.09 \ m/s^2}}[/tex]
Explanation:
We are asked to find the acceleration of a car. Acceleration is the change in velocity with respect to time. We will use the following formula:
[tex]a= \frac {v_f-v_i}{t}[/tex]
In this formula, [tex]v_f[/tex] is the final velocity, [tex]v_i[/tex] is the initial velocity, and [tex]t[/tex] is the time. The car slows down from 27.7 meters per second to 10.9 meters per second in 2.37 seconds. Therefore:
[tex]v_f[/tex]= 10.9 m/s [tex]v_i[/tex]= 27.7 m/s [tex]t[/tex]= 2.37 sSubstitute the values into the formula.
[tex]a= \frac{ 10.9 m/s-27.7 m/s}{2.37 \ s}[/tex]
Solve the numerator.
10.9 m/s - 27.7 m/s= -16.8 m/s[tex]a= \frac{-16.8 \ m/s}{2.37 \ s}[/tex]
Divide.
[tex]a= -7.088607595 \ m/s/s[/tex]
[tex]a= -7.088607595 \ m/s^2[/tex]
The original measurements of velocity and time have 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 8 in the thousandth place tells us to round the 8 in the hundredth place up to a 9.
[tex]a \approx - 7.09 \ m/s^2[/tex]
The acceleration of the car is approximately -7.09 meters per second squared. The acceleration is negative because the car is slowing down.
A physics student solving a physics problem has obtained the following four equations that describe the physics of a system of masses connected:
1. m2 = 3m1
2. --mig cosθ + T= miai
3. a1 = a2
4. m2g-T=m2a2
where g = 9.80 meter/ second^2 and θ = 60° are knowns, and mı, m2, a1, a2, and T are unknowns.
a. The problem requires the student to evaluate which are the unknowns that the student would like to eliminate from the equations?
b. The student decides to eliminate the unknown m2. Which two of the equations can be used to eliminate m2?
Answer: m1, m2, a1, T
Explanation:
A 1150 kg car is on a 8.70° hill. Using X-Y axes tilted down the plane, what is the y-component of the weight? (Unit = N)
Answer:
Explanation:
Assuming the x axis lies along the slope.
Fy = mgcosθ = 1150(9.81)cos8.70 = 11,151.6937... = 11.2 kN
What makes a good scientific question? (1 point)
o It helps decide the right choice in a situation.
o It directs how to apply knowledge.
O It is answered by observation and evidence.
O It is outside the bounds of natural phenomena.
C. It is answered by observation and evidence.
Good scientific explanations are defined, measurable and controllable. They can be answered by an experiment.
You are taking a turn at 30.0 m/s on a ramp of radius 25.0 m. What is your acceleration?
Acceleration = v^2 / r
Acceleration = 30^2/25
Acceleration = 900/25
Acceleration = 36 m/s^2
Find the exact value without a calculator. Tan 7pi/12=sin7pi/6/2 /cos7pi/6/2
Answer:
jh7j7j678j
Explanation:
[tex]-\frac{\sqrt{(x^{\frac{1}{2} }+1)(x^{\frac{1}{2} }-1) } }{x^{\frac{1}{2} }-1}[/tex]
convert .54g to dekagrams. NEED HELP!!!!!!
Answer:
.54 grams = .054 dekagrams
Explanation:
What is LCR circuit??
An LCR circuit is a circuit which has Inductors , Capacitor and Resistors connected to each other in an specific way.
An RLC circuit is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel. The name of the circuit is derived from the letters that are used to denote the constituent components of this circuit, where the sequence of the components may vary from RLC.
Warm air is more dense than cool air. Warm air is less dense than cool air Warm air and cool air have the same density
Answer:
You are exactly right. The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less
Brown is currently producing only corn; if he wants to produce some tobacco, in what order would he switch his fields from corn to tobacco production? What law does this represent? Explain.
Hello some data related to your question is missing attached below is the missing data
From the Table If Brown produces only Corn he will produce 50 but to produce some tobacco Brown will produce 40 Corn and 10 Tobacco to ensure the efficiency of production.
PPF ( production possibility frontier ) is a curve that shows/represent the production of various quantities of two(2) different commodities with the same limited amount of resource. In PPF the efficiency of production is not affected because the Increase in the production of a certain commodity will be balanced with a decrease in production of the other commodity. and The slope of PPF is the Marginal rate of transformation. and opportunity cost is kept constant.
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This is the location of an object.
Yes. This is indeed the location of an object.
Answer:
wdym
Explanation:
not much information
