Answer:
the stars which are red in color are cool.
Explanation:
The stars which has reddish color are cool in nature while those stars which has white and blue in color are very hot in nature. The stars change its color when they becomes hotter , first the star color reddish when they are cool but with increasing temperature it changes the color from reddish to orange then yellow. After yellow it turns green and finally get blue color when the stars are very very hot.
An eagle is flying above a mountain of height 2,700 m above sea level. Calculate the pressure on the eagle if the average density of air is 1.3 kg/m3,the atmospheric pressure at sea level is 76 cm Hg, and the density of mercury is 13,600 kg/m3.
Answer:
The correct option is;
(A) 25.8 cmHg
Explanation:
The given parameters are;
The height of the mountain over which the eagle is flying = 2700 m
The average density of air, ρₐ = 1.3 kg/m³
The atmospheric pressure at sea level = 76 cmHg = 0.76 mHg
The density of mercury, [tex]\rho _m[/tex] = 13,600 kg/m³
The formula for pressure, p, is p = ρ·g·h
The pressure in the atmosphere = 13,600 × 0.76 × g = 10,336·g
The equivalent height of air is found as follows;
1.3 × g × h = 10,336·g
h = 10,336/1.3 = 7,950.769 meters
Therefore;
The pressure of the atmosphere at 2,700 meters, p₂₇₀₀ = (2,700/7,950.769) × 76 cm Hg
Which gives;
p₂₇₀₀ = 25.808 cmHg ≈ 25.8 cmHg.
A lizard leaps 2.1\,\text m2.1m2, point, 1, start text, m, end text to the left in 0.52\,\text s0.52s0, point, 52, start text, s, end text. What was its average speed in \dfrac{\text m}{\text s} s m start fraction, start text, m, end text, divided by, start text, s, end text, end fraction
Answer:
v = 4.03 m/s
Explanation:
It is given that,
Distance covered by a lizard, d = 2.1 m
Time taken by lizard, t = 0.52 s
We need to find the average speed of the lizard. The distance covered divided by time taken is called the average speed of lizard. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{2.1\ m}{0.52\ s}\\\\v=4.03\ m/s[/tex]
So, the average speed of the lizard is 4.03 m/s.
Answer: 4.02 not 4.03
Explanation: I did on khan academy
A motor has an input power of 120 W and is 40 % efficient. Calculate the power wasted by the motor.
Answer:
72 W
Explanation:
60% is wasted, or:
0.60 (120 W) = 72 W
why why scientists uses atomic watches?
Answer:
Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
Select the arrangement of electromagnetic radiation which starts with the lowest wavelength and increases greatest wavelength. Multiple Choice radio, ultraviolet, infrared, gamma rays gamma rays, ultraviolet, infrared, radio radio, infrared, ultraviolet, gamma rays gamma rays, infrared, radio, ultraviolet gamma rays, radio, ultraviolet, infrared
Answer:
gamma rays, ultraviolet, infrared, radio
Explanation:
Because on the Electromagnetic spectrum wavelength increases from the gamma end to radio end and frequency decrease in that order
Answer:
radio → infrared → ultraviolet → gamma
Explanation: yeaaahhh its c
If the two blocks are moving to the right at constant velocity, A. the horizontal force that B exerts on A points to the left. B. the horizontal force that B exerts on A points to the right. C. B exerts no horizontal force on A. D. not enough information given to decide
Answer:
D. not enough information to decide
Explanation:
i dont understand >.<
the handles of tin-snips (metal cutter) are made long ,why
Answer:
because lwhen they are made longer than the turning effect of force is more and its easy to work it out.
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480N. if the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree of the ground
Answer:
The input force is 87.27NExplanation:
Mechanical advantage (M.A)of a machine is the ratio of load to effort
GivenM.A= 5.5
load= 480N
effort= ?
Applying the formula and substituting to find the effort we have
[tex]M.A= \frac{load}{effort}[/tex]
[tex]5.5= \frac{480}{effort}\\\effort= \frac{480}{5.5} \\\effort= 87.27N[/tex]
A14 is running toward the goal. her teammate, a12, kicks the ball toward a14. a14 did not see the ball coming and the ball strikes her in the back of the hand as her hand is at her side. the proper call would be to:
The Available options are:
A. Award an indirect free kick to Team B for incidental contact.
B. Award a direct free kick to Team B.
C. Allow play to continue as the handling was incidental but issue a caution to the player at the next stoppage of play.
D. Allow play to continue.
Answer:
Allow play to continue.
Explanation:
IFAB (International Football Association Board) has approved various means to clarify the issue of handball in foodtball.
Hence, some of the cases include:
1. Should the the ball touches a player's hand/arm immediately from their own head/body/foot or the head/body/foot of another player.
2. the ball touches a player's hand/arm close to their body and has not made their silhouette unnaturally bigger.
3. a player is falling and the ball touches their hand/arm when it is between their body and the ground (but not extended to make the body bigger).
4. Additionally, should the goalkeeper attempt to clear a ball from a teammate but fails, the goalkeeper is allowed to handle the ball.
Hemce, Since a14 who did not see the ball coming and the ball strikes her in the back of the hand as her hand is at her side. the proper call would be to: ALLOW PLAY CONTINUE
Why would it be difficult to experimentally calculate the speed of sound in the classroom with a stopwatch and meter stick?
Answer:
Sound travels quite fast and sound wave must pass through a medium, such as air.
To measure a sound in classroom you will require to measure the time it takes a sound to travel a measured distance using stopwatch and meter stick but it would be difficult because walls of classroom will create echos echos.
Echos are reflections of sounds which causes timing errors and make difficult to meausre the speed of sound.
PLEASE HELP WILL GIVE BRANLIEST IF CORRECT
Which labels best complete the diagram?
1) X: Brush Y: Armature Z: Commutator
2) X: Commutator Y: Brush Z: Armature
3) X: Armature Y: Commutator Z: Brush
4) X: Armature Y: Brush Z: Commutator
Answer:
Explanation:
z: commutatory: brush x: armatureAnswer:
4
Explanation:
X would be armature.
Y is the brush because when z moves the circuits, the brush moves with it
the commutator helps turn the circuits, so that would be z.
output work is always less than input work,why
Answer:
Output work is always less than input work due to effect of friction. Machines are frictionless in practice, the efficiency of a machine can never be 100%.
Hope this helps..
Good luck on your assignment..
Answer:
Friction
Explanation:
The springs in a car’s suspension have a spring constant of 50 000 N/m. The elastic potential energy store is 0.025 J. Calculate the extension of the springs.
Answer:
1 mm
Explanation:
E = ½ kx²
0.025 J = ½ (50,000 N/m) x²
x = 0.001 m
x = 1 mm
The student concluded that the current in the LDR is inversely proportional to the potential difference across the LDR. Explain why the student's conclusion is incorrect.
The given question is incomplete as the essential graphical result is missing, however the correct graph is attached with the answer :
Answer:
The correct answer is - According to the graph, the current in the LDR is directly proportional to the potential difference across the LDR.
Explanation:
Two variables that are in directly proportion will consistently deliver a straight-line graph that goes through the beginning. On the off chance that the steady of proportionality is sure, the chart will have a positive slope. On the off chance that the steady is negative, the graph will have a negative angle.
In the given data and graph of the result collected by the student shows a straight line in between the current in the LDR and the potential difference across the LDR. It means they are in relation of directly proportional.
Thus, the correct answer is - According to the graph, the current in the LDR is directly proportional to the potential difference across the LDR.
A cyclist is riding his bike up a mountain trail. When he starts up the trail, he is going 8 m/s. As the trail gets steeper, he slows to 3 m/s in 1 minute. What is the cyclist’s acceleration? –0.08 m/s2 0.08 m/s2 –12 m/s2 12 m/s2
Answer:
-0.08m/s²
Explanation:
What are some of the major differences between the ancient Olympics and modern-day Olympics? List and describe at least two differences.
Answer:
Women are now allowed to participate in the Olympics. The original Olympic Games were open only to men.
Modern Olympic Games include many more events. The first Olympics included only a running event. Today, there are more than 20 different sports and almost 300 events.
The Olympics are held every two years, alternating between summer and winter. The ancient Olympics were originally held every four years in Olympia.
Athletes from countries around the world participate in the modern Olympics. The ancient Olympics consisted of athletes only from ancient Greece.
Explanation:
plato
Determine the following quantities for the circuits shown below:
(a) the equivalent resistance
(b) the total current from the power supply
(c) the current through each resistor
(d) the voltage drop across each resistor and
(e) the power dissipated in each resistor.
WILL MARK AS BRAINLIEST!
in a parallel circuit equivalent resistor is,
1/R = 1/20 + 1/100 + 1/50
so 1/R = 5/100 + 1/100 + 2/100
= 8 /100
1/R = 8/100
8R = 100
R = 12.5 ohms
b) v = IR
125 = I × 12.5
I = 125/12.5
I = 10A
c) resistor with 20 ohms
v = ir
125 = 20I
I = 6.25 A
the resistor with 100
125 = 100I
I = 125/100
= 1.25A
the resistor with 50 ohms
125 = 50I
I = 125 /50
2.5A
if u want to make sure all these calculations are crct add them up and see
A resistor is an electrical component that provides electrical resistance or limits the flow of current in a circuit. For calculating resistance (R) values of voltage(V) and current (I) should be known.
The correct quantities are (a) 12.5 ohms, (b) 10A (c) 6.25 A, 1.25A, 2.5A (d) 125 V (e) 781.25 W, 156.25 W and 312.5 W.
The calculations are as follows:
Given,
R1 = 20 ohmsR2 = 100 ohmsR3 = 50 ohms(a) Equivalent resistance in parallel resistor:
[tex]\rm \dfrac{1}{Req} = \dfrac{1} {R1} + \dfrac{1} {R2} + \dfrac{1} {R3}[/tex]
[tex]\rm \dfrac{1}{Req} = \dfrac{1} {20} + \dfrac{1} {100} + \dfrac{1} {50}[/tex]
So,
[tex]\rm \dfrac{1}{Req} = \dfrac{5} {100} + \dfrac{1} {100} + \dfrac{2} {100}[/tex]
[tex]\rm \dfrac{1}{Req} = \dfrac{8} {100}[/tex]
Req = 12.5 ohms
(b) Current can be calculated using the formula:
V = IR
Where,
V = 125 V
I = ?
R = 12.5 ohms
Substituting values in equation:
[tex]\rm 125 = I \times 12.5[/tex]
[tex]\rm I = \dfrac {125 }{12.5} \\\\I = 10 A[/tex]
Therefore, current is 10 Amperes.
(c) Current through each resistor:
Given,
V = 125 V
I = ?
Resistor 1: V = IR[tex]\rm 125 = I \times 20\\\\I1 = 6.25 A[/tex]
Resistor 2: V = IR[tex]\rm 125 = I \times 100\\\\I2= 1.25A[/tex]
Resistor 3: V = IR[tex]\rm 125 = I \times 50 \\\\I3= 2.5 A[/tex]
(d) Voltage drop across each resistor in a parallel circuit can be calculated by:
For parallel:
Given from (c)
I1 = 6.25
I2= 1.25 A
I3 = 2.5 A
Resistor 1: V = IR[tex]\rm V1 = 6.25 \times 20\\V 1 = 125[/tex]
Resistor 2: V = IR[tex]\rm V2 = 1.25 \times 100\\ V2= 125[/tex]
Resistor 3: V= IR[tex]\rm V3 = 2.5 \times 50\\ V3= 125[/tex]
(e) Power dissipated by each source can be calculated by the following formula:
Given,
V = 125 V
[tex]\rm P = \dfrac {V^{2}}{ R}[/tex]
Resistor 1:
[tex]\rm P = \dfrac {(125)^ 2 }{ 20}\\\\P1 = 781.25 W[/tex]
Resistor 2:
[tex]\rm P = \dfrac {(125)^ 2 }{ 100}\\\\P2 = 156.25 W[/tex]
Resistor 3:
[tex]\rm P = \dfrac {(125)^ 2 }{ 50}\\\\P3 = 312.5 W[/tex]
Therefore, (a) 12.5 ohms, (b) 10A (c) 6.25 A, 1.25A, 2.5A (d) 125 V (e) 781.25 W, 156.25 W and 312.5 W.
To learn more about resistors in parallel circuit follow the link:
https://brainly.com/question/25686930
Vanessa jogged 8 miles in 2 hours. What was her average speed?
Answer:
4 mph
Explanation:
This is because, if you divide the miles jogged by the hours you get 4.
Answer:
4 mph
Explanation:
Use the formula for average speed: [tex]Speed = \frac{Distance}{Time}[/tex]
The distance that Vanessa traveled is 8 miles and the time she traveled was 2 hours. Therefore, put those numbers in their corresponding spots in the formula and solve for Speed by dividing 8 and 2: [tex]Speed = \frac{8}{2}[/tex]
Okay please help me all my assignments are due tomorrow! I need to know 5 examples of all 6 simple machines that can be found in a house! Please specify the machine for the items! Thank you!
EXAMPLE
BIKE/STROLLER - WHEEL AND AXLE
SCISSORS/HEDGE CUTTER - LEVER
STAIRS - INCLINED PLANED
SCREW DRIVER/SCREW/NAILS- SCREW
AXE - WEDGE
WELL - PULLEY
Its not much but hope this help you
a skier traveling 11m/s goes up a 19 degree inclined plane, and glides up 15m before coming to rest. what is the average coefficient of friction?
Answer:
do you mind telling me what is it your asking so i can help ?
Explanation:
Will mark brainliest for the first person who answered correctly Which of the following is an example of non-renewable energy? Hydroelectric Gas Solar Wind
Answer:
gas is non-renewable resource
Explanation:
Answer:
Gas
Explanation:
There are two types of energy sources, renewable and non-renewable.
Solar energy, wind energy, and hydroelectric are an example of renewable energy.
Fossil fuels like gas, coal, and petroleum are an example of non-renewable energy.
If the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart. What are the variables in her hypothesis?
This question is incomplete because part of the content is missing; here is the complete question:
Ingrid wrote the hypothesis below. If the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart.
What are the variables in her hypothesis?
A. The independent variable is the temperature, and the dependent variable is the density.
B. The independent variable is the density, and the dependent variable is the temperature.
C. The independent variable is the temperature, and the dependent variable is the distance between particles.
D. The independent variable is the distance between particles, and the dependent variable is the temperature.
The answer to this question is A. The independent variable is the temperature, and the dependent variable is the density.
Explanation:
To begin, the variables in an experiment are the factors being studied or analyzed, which are expressed in the hypothesis. According to this, the two variables in the experiment are the temperature and the density.
Additionally, in experiments, it is common one of the variables is independent, which is the factor manipulated by the researcher, and the other is dependent as this is expected to be changed by the first variable. If this is applied to the experiment described, the temperature is independent because this will be manipulated by Ingrid to prove density changes. Also, the density is expected to be affected by the first variable, and therefore density is the dependent variable.
With all his gear, Neil Armstrong weighed 360 pounds on Earth. When he landed on the Moon, he weighed 60 pounds. Why? A. His mass changed while traveling to the Moon. B. The gravity on the Moon is six times the gravity on Earth. C. The gravity on the Moon is less than the gravity on Earth. D. He experienced the effects of a gravity slingshot.
Answer:
C
Explanation:
Answer:
C) The gravity on the Moon is less than the gravity on Earth.
Explanation:
Since Moon is smaller than Earth, any mass on Moon will experience less gravitational force and so that mass will weigh less on Moon.
Arace car starts from rest and accelerates uniformly to a speed of 40 m/s in 8.
seconds. How far will the car travel during the 8 seconds?
meters
Type the correct answer, then press Enter.
Answer:
160 m
Explanation:
For computing the distance first we have to determine the acceleration which is shown below:
v = u + at
where,
v = 0 = initial velocity
u = 40 = uniformly to a speed
t = 8 = time
So, the a is
= 40 ÷ 8
= 5 m/s
Now we have to use the distance formula i.e
d = ut + 1 ÷ 2 at^2
= 1 ÷2 × 5 × 8^2
= 160 m
Basically we have to applied the above formulas so that the distance could come
Calculate the capacitance of a system that stores 4.0 * 10-10 C of charge at
250.0 V. Use C=
AV
O A. 1.0 x 10-7F
O B. 6.2 x 1011 F
O C. 1.6 x 10-12F
O D. 1.0 x 107 F
Answer:
The capacitance is 1.6*10^-12FExplanation:
Given data
charge Q=4.0 * 10^-10 C
voltage v=250.0 V
applying the formula we can solve for C
[tex]Q=CV[/tex]
[tex]4.0 * 10^-10= C*250\\\C= \frac{4.0 * 10^-10}{250} \\\C= 1.6*10^-^1^2F[/tex]
A suitcase of mass 20 kg moves along a conveyer belt at 0.5 m/s. Calculate its kinetic energy.
Answer:
K.E.=2.5Nm
Explanation:
m=20kg
v=0.5m/s
K.E.=?
K.E.=1/2mv²
K.E.=1/2×20kg×(0.5m/s)²
K.E.=10kg×0.25m²/s²
K.E.=2.5Nm
i hope this will help you :)
Nuclear fusion combines nuclei to form: lighter elements heavier elements
Answer:
The answer is
heavier elementsHope this helps you
Answer:
B. heavier elements
Explanation:
if the relative density of a liquid is 0.34 what is the density of the liquid
Answer:
340 kg/m³
Explanation:
[tex]Relative density \: = \frac{density \: ofsubstance}{density \: of \: equal \: volume \: ofwater} [/tex]
density of water = 1000 kg/m³
density of the liquid = 0.34 × 1000
= 340 kg/m³
A 1250 kg car is stopped at a traffic light. A 3550 kg truck moving at 8.33 m/s hits the car from behind. If bumpers lock, how fast will the two vehicles move?
Answer:
the two vehicles will be moving at a speed of 6.16 m/s
Explanation:
This is a case of completely inelastic collision, therefore, the conservation of momentum can be written as:
[tex]m_1\,v_1+m_2\,v_2=(m_1+m_2)\,v_f[/tex]
which given the information provided results into:
[tex]m_1\,v_1+m_2\,v_2=(m_1+m_2)\,v_f\\(1250)\,(0)+(3550)\,(8.33)=(1250+3550)\,v_f\\29571.5=4800\,v_f\\v_f=6.16\,\,m/s[/tex]
The density of air is 1.3 kg/m^3. What mass of air is contained in a room measuring 2.5m x 4m x 10m? Give your answer in kg. Brainliest will be given!! (Formula for density is P= M/V)