Plzzz help!! A stationary speed gun emits a
microwave beam at 2.10x1010 Hz. It
reflects off a car and returns 1030 Hz
higher. What is the speed of the car?
(Unit = m/s)
Answers
Answer:
The speed of the car is 14.7m/second or 15 m/second approximately.
Explanation:
A microwave beam at [tex]2.10\times10^1^0Hz[/tex] is generated by a stationary speed gun. It bounces off a car and returns at a higher frequency of 1030 Hz. The car's observed frequency would be the product of adding the two frequencies. That is to say,
F =[tex]2.1\times10^1^0+1030[/tex] =[tex]2.100000103\times10^1^0Hz[/tex]
Using doppler effect formula
[tex]F=\frac{C}{C-V}\times f[/tex]
Where
F = observed frequency
f = source frequency
C = speed of light = [tex]3\times10^8[/tex]
V = speed of the car
Putting the values in the formula -
[tex]2.100000103\times10^1^0=\frac{3\times10^8}{3\times10^8-V}\times2.1\times 10^1^0[/tex]
[tex]\frac{2.100000103\times10^1^0}{2.1\times10^1^0}[/tex] [tex]=\frac{3\times10^8}{3\times10^8-V}[/tex]
[tex]1.000000049=\frac{3\times10^8}{3\times10^8-V}[/tex]
by cross multiplication ,
300000014.7 - 1.000000049V = [tex]3\times10^8[/tex]
Collect the like terms
1.000000049V = 14.71429
Make V the subject of formula
V = [tex]\frac{14.71429}{1.000000049}[/tex]
V = 14.7 m/s
Therefore , the speed of the car is 15m/second approximately.
Related Questions
DO NOW: You are picking up a pendulum (Clay ball on a string) as you pull the pendulum up on one side and let it fall, what types of energy are being used?
Answers
Answer:
The energy used in the pendulum is the initial Potential (Mechanical) Energy, P.E. given to the Clay ball attached to the inclined and extended string by virtue of its elevated position in relation to the rest position (lower state)
The swinging of the pendulum is brought about by the dynamic equilibrium between the initial potential energy, P.E. and the Kinetic Energy, K.E., of the pendulum when it is in motion
The (total) Mechanical Energy, M.E. of the ideal pendulum is constant at all times during the motion of the pendulum and it is given by the following formula;
M.E. = P.E. + K.E.
At the top of the swing, P.E. is maximum and K.E. is zero
Similarly, at the mid (lowest) point in the swing, instantaneously, P.E. is zero and K.E. is maximum
Explanation:
If you walk at an average speed of 5 km/h for 30 minutes,
how far will you walk?
Answers
Answer:
150
Explanation:
30 times 5 = 150 i think
Mention theree disadvantages of friction
between
the parts of a
machine
How does. 1 . oiling
2 using ball bearing
3) Help recluce friction
pleaze help me to this question
Answers
Answer:
Please find the answer in the explanation.
Explanation:
Mention three disadvantages of friction between the parts of a machine
Three disadvantages of friction between the part of a machine are;
1. Friction causes wear and tear of machine parts.
2. Friction generates heat between the part of a machine.
3. Friction reduces the efficiency of a machine.
How does.
1 . oiling
2 using ball bearing
To reduce friction, you need to apply a lubricant. Oil and grease are examples of a lubricant. A lubricant helps to reduce friction by making the surface of the machine parts slippery thereby reducing tear and wear.
Also, friction can be reduced by using ball bearing which will allow the rolling of machine parts.
A tractor pulls a 978 kg wagon at a velocity of 4.9 m/s. How many watts of power are exerted by the tractor motor is the tractor pulls the wagon at a 60 degree angle?
Answers
Answer:
23481.78 W
Explanation:
The computation of number of watts of power is shown below:
M = 978 kg
V = 4.9 m/s
Theeta = 60°
As we know that
P = Fcos(theeta).V
F = Mg
P = (Mg)cos(theeta).V
P = 978×9.8×cos(60)×4.9
P = 23481.78 W
Miles Tugo is camping in Glacier Canyon and he makes a loud holler. The sound bounces off the nearest canyon wall (which is located 170 meters away from Miles) and returns to Miles.
Determine the time elapsed between when Miles makes the holler and the echo is heard.
Answers
Answer:
It would take 1 s to hear the echo.
Explanation:
Here, the sound covered a total of 340 meters, since it bounces off the canyon wall and travels back to Miles in the form of echo.
The time elapsed can be determined by,
v = [tex]\frac{2D}{t}[/tex]
⇒ t = [tex]\frac{2D}{v}[/tex]
where: v is the speed of sound in air (343 m/s), D is the distance of the nearest canyon (170 m).
So that,
2D = 2 x 170 = 340 m
Thus,
t = [tex]\frac{340}{343}[/tex]
= 0.9913 s
t = 1 s
It takes 1s for Miles to hear his echo.
what is a benefit of fossil fuel consumption?
Answers
Answer:
increased greenhouse gases
Explanation:
I think this is the right answer...
What will most likely happen if a sound wave moves from the air through a solid?
O It will increase in frequency.
O It will decrease in speed.
O It will increase in speed,
O It will decrease in wavelength.
Answers
The most likely outcome when a sound wave moves from the air through a solid is : ( C ) It will increase in speed
Sound wavesA sound wave is disturbance pattern that goes through a medium such as air and any liquid or solid medium. when a sound wave moves from air medium through a solid medium the speed at which the sound waves moves will increase due to the change in medium.
Hence we can conclude that the most likely outcome when a sound wave moves from the air through a solid is it will increase in speed.
Learn more about sound waves : https://brainly.com/question/1199084
A compact car, mass 664 kg, is moving at 19 km/h toward the east. What is the car's momentum in kg x m/s?
Answers
Answer:
3504.4 kgm/s
Explanation:
First, convert km/hr to m/s:
19 km/hr x 1000m/1km x 1/60min x 1/60s = 5.28 m/s
p = mv
p = (664 kg)(5.28 m/s) = 3504.4 kgm/s
formula of average speed
Answers
Answer:
Hey mate....
Explanation:
This is ur answer.....
Hope it helps!
Mark me brainliest....
FOLLOW ME!!! :)
An organism with the alleles Aa is called __________, while one with AA or aa is called __________.
A. heterozygous, hom/ zygous
B. heterozygous, homo/zygous
Answers
Answer:
Hetefrozygous, homofzygous
If a sample of an unknown material with a mass of 0.68 g and a volume of 0.8 cm3 is dropped
into maple syrup, will it sink or float? maple syrup has a density of 1.33 g/cm3
Answers
how to prevent air resistance or what reduces air resistance?
Answers
Answer:
reducing the area in contact with air and being more streamlined
Explanation:
The amount of air resistance an object experiences depends on its speed, its cross-sectional area, its shape and the density of the air
PLEASE HELP 20 POINTS
A car of mass 700 kg and moving at a speed of 30 m/s collides with a stationary truck of mass 1400 kg, and the two vehicles lock together on impact. The combined velocity of the car and truck after the collision is m/s.
Answers
10m/s
Explanation:
(m1)(v1)+(m2)(v2)= (m1+m2)(v[final])
(700)(30)+(1400)(0)= (700)(v)+(1400)(v)
21000= 2100v
v=10m/s
What is motion? Short sentence
Answers
Can someone please help me with this
Answers
Answer:
i dont know about this
Explanation:
Is 35 miles per hour a vector or a scalar?
1. vector
2. scalar
Answers
Answer:
scalar
is the correct answers
Answer:
Scalar
Explanation:
Mph, cubic feet,pounds, and hours are scalar terms
If a car is traveling 35 m/s for 200 seconds, how far will the car travel?
Answers
Copper and hydrogen con euch be formed by electrolysis,
At which electrodes are these stoments formed?
copper
hydrogen
A
anode
anode
B
anode
cathode
cathode
anode
D
cathode
cathode
ОА, А
Answers
Answer:
C.cathode, cathode
Explanation:
In electrolysis, a device called ELECTRODE, which electric current passes through is used. However, electrodes can either be anode or cathode depending on the charge. Anode is a positive electrode that attracts negative ions while cathode is a negative electrode that attracts positive ions.
According to this question, Copper (Cu) and hydrogen (H) which are both positive ions i.e. Cu2+ and H+ will move towards and form at the CATHODE. Hence, the answer is cathode, cathode for the respective element.
A toy car, as shown below, is moving forward with a force of six Newton's. If the wind blows from behind with a force of two Newton's, what will happen to its speed and position
Answers
Answer:
its speed will increase to 8 newtons allowing its position to dramatically change.
True or false? Humans use more water for washing at home than for any other use.
Answers
Which possesses the most gravitational potential energy?
A. a 4 kg object 0.25 m above the ground.
B. a 100 g object 20 m above the ground.
C. a 2kg object 0.75 m above the ground.
D. a 50 g object 30 m above the ground.
Answers
Answer:
uxjdkddoedlkfkkllllllllo
Pls someone help me!!!!!
Answers
Answer:
Seeing as how the balloon is mainly negatively charged and the paper being positively charged, the answer would be B: The tissue paper will stick to the balloon because the tissue paper is positively charged!
The diagram shows the speed-time graph of a car travelling between two sets of traffic lights.
Calculate the distance travelled by the car in the first 5 seconds of its journey.
Answers
= 12 x 5 = 60 m
the mass of the earth is 6 × 10²² kg and that of the moon is 7.4× 10²² Kg if the distance between the earth and moon is 3.84 × 10⁵ km . calculate the force of the earth exerted by it on the moon . Take G = 6.67×10¹¹ Nm² / kg²
Answers
Answer:
Force = 20.08 x 10⁴⁷ N
Explanation:
Given:
M1 = 6 × 10²⁴ kg (rectified)
M2 = 7.4× 10²² Kg
Radius r = 3.84 × 10⁵ km
G = 6.67×10¹¹ Nm² / kg²
Find:
Force
Computation:
F = GM1M2 / r²
Force = [(6 × 10²⁴)(7.4× 10²²)(6.67×10¹¹ )] / (3.84 × 10⁵)²
Force = [296.148 × 10⁵⁷] / [14.7456 × 10¹⁰]
Force = 20.08 x 10⁴⁷ N
Pedro picked up and held a cube of ice in his hand and noticed that he no longer felt a difference in temperature after the ice cube melted in his hand. Which of the following statement best explains what happened?
1.Heat was transferred from Pedro’s hand to the ice increasing the temperature of the ice.
2.Heat was released from the ice cube into the air increasing the temperature of the ice.
3.Cold was transferred to Pedro’s hand from the ice increasing the temperature of the ice.
4.Heat was released from Pedro’s hand into the air melting the ice increasing the temperature of the ice.
Answers
Answer:
the answers is 1.
Explanation:
this is because heat always travel's from the warmest object to the coldest. His hands thermal energy is transferred to the ice making the ice round to the same temperature of his hand. This can also be an example of equalibrum.
Approximately what % of the moons surface is illuminatednon a new-moon day?
Answers
Answer: 0%
Explanation: hope this help
what is the mass of modelling clay?
Answers
the mass of modelling clay is 500g
What is the difference between a bar magnet and an electromagnet? (check all that are
true)
A . A bar magnet is a permanent magnet that will keep its magnetism for a long time
B . An electromagnet is always stronger than a bar magnet.
C . A bar magnet will only stay a magnet if it is in contact with something metal.
D . An electromagnet is a temporary magnet that is only magnetic when electricity is flowing through the wire.
Answers
Answer:
D and A
Explanation:
Hint The basic difference between them is that a bar magnet is a permanent magnet whereas an electromagnet is a temporary magnet. An electromagnet is formed when an electric current is passed through wires wound around soft metalcore. An electromagnet loses its magnetism once the current flow is stopped.
A .8 kg block is attached to the end of a spring whose spring constant is 85 N/m. The block is placed on a frictionless tabletop, give an initial displacement of 3.5 cm and then released. What is the magnitude of this energy?
Answers
Answer:
E = 0.052 J
Explanation:
We are given;
Spring constant; k = 85 N/m
Displacement; x = 3.5 cm = 0.035 m
Formula for the energy is;
E = ½kx²
E = ½ × 85 × 0.035²
E = 0.052 J
Why do you think the speed of sound is higher
in solids, than liquids and gases?
Answers
Answer:
Explanation:
Particles of a solid are closely packed, and when a solid is hit to produce a sound the kinetic energy present in the solid will cause the particles to vibrate vigorously in the intermolecular spaces in the solid, whereas the paticles of liquids and gases are rather further apart therefore having large intermolecular spaces between particles.