Sonar is used to determine the speed of an object. The object is moving at 8.4146 m/s.
What is frequency?The frequency of any wave is defined as the number of cycles per second.
The frequency of the sound received is
f' = f x [(V+Vo /V-Vo)]
where f = 40kHz, f' = 42kHz, V =345 m/s, then the velocity of the observer will be
(V+Vo /V-Vo) = 42/40 =1.05
On rearranging the doppler shift formula, we have
Vo = 0.05 x 345 /2.05
Vo = 8.4146 m/s.
Thus, the object is moving at 8.4146 m/s.
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if earth struck by a small asteroid how will the hours of daylight and night change?
Answer:
Nothing
Explanation:
We get struck by small asteroids. imperciptable changes in our degree of tilt and rate of rate of rotation
Which one is evidence that electricity is flowing?
A motor in a circuit is not moving
The battery is connected
A light bulb shines
Answer:
C. A light bulb shines
Explanation:
When electricity flows through a circuit and powers the light bulb, the light bulb would shine.
The answer isn't B because if the battery was only connected to the circuit without the circuit being turned on by the switch, electricity would not flow from the battery to the light bulb.
How much work is done on the object as it moves from 6.0m to 9.0m
Answer:
W = 3F
Explanation:
Work is defined as the inner product between force and displacement. The inner product picks out the force components which point in the same direction as the displacement. The vertical components do not matter in the horizontal displacement. I am assuming you're dealing with 1-dimensional motion? Then the work would be:
[tex]W=Fd[/tex]
The displacement is 3 meters. Therefore, the work is:
[tex]W=3F[/tex]
You haven't gave the force being applied to the object, so I cannot give an explicit answer. Just multiply the force by 3 to get the work.
Which of the following is an example of in-group bias? A. Avery, who loves to go to car shows B. Shelly, who thinks her cheerleading team is better than any other school's team C. Zoe, who likes to shop more than anything else D. Matt, who loves to watch his favorite team play football
Answer:
B because since SHE is in the team she is in group and it is bias because she treats the other teams as competition. Hope this helps!
Explanation:
The contents of your résumé should always be:
o relevant
the same
personal
current
The contents of your résumé should always be relevant.
What is resume?A resume is a brief information about a person's academic life achievements and organizational experience stated in short in order to get a highly paid job.
A resume should include all the relevant information that help the employers easily shortlist candidates of their choice relating the job profile. It is understandable by resume that who you are and why you're a good fit for the job.
Thus, the contents of your résumé should always be relevant.
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You are walking through the woods and cone acroos an old well thats 15 meters deep if the speed of sound and air is 340 m/s then how long would it take to hear echo
Answer:
.0882 s
Explanation:
Sound has to travel to the bottom (15 m) then back up (15m ) to hear the echo
(15 + 15 m) / 340 m/s = .0882 s
A body with an initial velocity of 4m/s accelerates uniformly at the rate of 1.2 m/s² over a distance of 20 m. Calculate: (i) the final velocity of the body.(ii) the time in which the body covers that distance. (iii) the average velocity of the body during the journey
v² = u² + 2as
v² = 4² + 2 × 1.2 × 20
v² = 16 + 2 × 12/10 × 20
v² = 16 + 48
v² = 64
v = 8 ms - 1
So,the final velocity is 8 m/sii)
V = u + at
8 = 4 + 1.2 × t
8 - 4 = 1.2t
4 = 12/10 t
4 × 10 /12 = t
3.33 = t
So,the time is 3.33 secondsiii)Average velocity = Displacement/Time
20/3.33
6.006 ms - 1
So,the average velocity is 6.006 m/sLab:Motion
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A tourist, who weighs 805 N, is walking through the woods and crosses a small horizontal bridge. The bridge rests on two concrete supports, one at each end. He stops one-fourth of the way along the bridge. Assume that the board of the bridge has negligible weight. What is the magnitude of the vertical force that a concrete support exerts on the bridge at the far end?
The magnitude of the vertical force that a concrete support exerts on the bridge at the far end is 201.25 N.
What is force?The force is an action of push or pull which makes a body to move or stop.
Given is the weight of tourist W = 805 N and L is the length of the bridge.
Let the reaction force at both the ends of the bridge is R1 and R2.
Taking the moments about point A,
R1 x 0 - W x L/4 +R2 x L =0
R2 = W/4
R2 = 805 /4
R2 = 201.25 N
Thus, the magnitude of the vertical force that a concrete support exerts on the bridge at the far end is 201.25 N.
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A model airplane heads due east at 1.50 meters per second, while the wind blows due north at 0.70 meter per second. The scaled diagram below represents these vector quantities.
A)1.7m/s
B)1.7m/s^2
C)2.2m/s
D)2.2m/s²
The resultant physical quantity, velocity is 1.7 m/s. The correct option is A.
What is triangle law of vector addition?When two vectors are represented by vectors, their resultant will be the closing side of the triangle.
A model airplane heads due east at 1.50 meters per second, while the wind blows due north at 0.70 meter per second.
The right angle triangle is formed from the two velocity vectors and its resultant will be its hypotenuse.
Then, from the Pythagoras theorem,
Vr ² = (0.70)² + (1.50)²
Vr = 1.65 m/s
Thus, the resultant velocity is approximately 1.7 m/s.
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In which 120-V light bulb does the filament have greater resistance: a 60-W bulb or a 120-W bulb?
Answer:
60W
Explanation:
A higher watt bulb allows more electricity through, therefore the resistance must be lower.
Suppose you were to make a three-dimensional model of magnetic force
using magnetic field lines and a magnet. Which two characteristics might
your model have?
A. The field lines exist only at the top and the bottom of the magnet.
B. Arrows on the field lines point from the magnet's north pole to its
south pole.
C. The field lines near the magnet are far apart.
D. The field lines do not cross paths as they go from one pole of the
magnet to the other.
दा
Answer:
D. Po cguro pero I will study hard to get the correct answer and I will share to you pero I try mo Lang po Yan kac halos kami dito Yan po Yung nilagay namin na answer baka kac Tama po e Kaya tau mag aral po tau ng mabuti Para MAtopad natin Yung mga pangarap natin at making tau sa mga pamilya at guro Yung Lang po good bless
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the rifle has more mass than the bullet.
[tex]p_{1} =-p_2}[/tex]
[tex]m_{1} V_{1} =-M_{2} v_{2}[/tex]
Answer:
Explanation:
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small and typically fast because the rifle has more mass than the bullet.
1. Describe the three Newton's Law of Motion.
Answer:
1st law--Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net forceacting on an object (if all the external forces cancel each other out) then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.
2nd— The second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum(mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the "changes" expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object's mass and its acceleration a:
F = m * a
For an external applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways.
3rd law-- The third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A. Notice that the forces are exerted on different objects. The third law can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.
How long will it take for a person walking at 8 Km per hour to cover a distance of 56 Kilometers?
Answer:
7 hrs
Explanation:
56 km / 8 km/hr = 7 hr
1. The object or point from which movement is determined is called a
of
Answer: reference point
Explanation: A reference point could be a put or question utilized for comparison to decide in case something is in movement.
Do electrons flow easier with
HIGH resistance or LOW
resistance?
A. low
B.high
Answer:
low.
Explanation:
it makes the flow easier if its lower because, the resistance isn’t pushing as hard against the flow which means that the flow is easier.
what are loops and its types
Answer:
A for loop is a loop that runs for a preset number of times. A while loop is a loop that is repeated as long as an expression is true. An expression is a statement that has value. A do while loop or repeat until loop repeats until an expression becomes false.
Mars had a mass of 6.38* 10^23 kg and a radius of 3,390,000meter what is the force of gravity experienced by a mars rover with a mass of 3.7 kg playing in the Martian surface
I hope its helps you . you can also write 1.44×10^3 it will be better
A horizontal rectangular surface has dimensions 3.00 cm by 4.20 cm and is in a uniform magnetic field that is directed at an angle of 32.0 ∘ above the horizontal.
What must the magnitude of the magnetic field be to produce a flux of 3.60 × 10 −4 Wb through the surface?
Hi there!
Recall the equation for magnetic flux.
[tex]\Phi _B = \oint B \cdot dA[/tex]
We can also rewrite this as:
[tex]\Phi_B = B \cdot A = BAcos\phi[/tex]
B = Magnetic field strength (T)
A = Area of surface (m²)
φ = angle between the surface's area vector and magnetic field
Since the rectangular surface is horizontal, its perpendicular area vector points straight UP.
The magnetic field makes an angle of 32° with the surface but makes an angle complementary to this angle with the AREA VECTOR. (Think: the vertical)
Complementary of 32° ⇒ 90° - 32° = 58°
Now, we can rearrange the above equation to solve for the magnetic field.
[tex]\Phi_B = BA cos\phi \\\\B = \frac{\Phi_B}{Acos\phi}\\\\B = \frac{3.6 \times 10^{-4}}{(0.03 * 0.042)cos(58)} = \boxed{0.539 T}[/tex]
A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. What is the acceleration of the roller coaster?
Answer:
The acceleration is
Explanation:
Acceleration = final velocity - initial velocity
---------------------------------------
speed
Initial velocity = 10m/s
final velocity = 22m/s
speed = 2 secs
acceleration = 22 - 10
-----------
2
= 12/2
6 m/s^2
There is an increasing use of LEDs for lighting. What does LED stand for?
Answer:
LED stands for light emitting diode. LED lighting products produce light up to 90% more efficiently than incandescent light bulbs.
Discuss why schizophrenia disorder interests you.
Describe how schizophrenia impacts someone on a daily basis.
Describe the labels and/or stigma associated schizophrenia. (i.e. “crazy,” “insane,” “get over it,” “psycho,” “neurotic,” etc).
Answer:
schizophrenia is a chronic disease meaning it doesn't go away. It affects a person mentally, and on a daily basis is hard to see who or what is reality or an illusion. People with schizophrenia have a hard time getting a job, because it's hard to focus.
Most stigmas people have with schizophrenia is paranoid, or insane. They think something or someone is following them because they see something that makes them uncomfortable all the time.
Explanation:
How much kinetic energy does a 0.30-kg stone have if it is thrown at44
Answer:
290.4 joules
Explanation:
As the formula to find kinetic energy is 1/2 mv^2.
So if we put the given data in it,the answer comes 290.4 joules
An object moving at 15 m/s slows uniformly at a rate of 2.0 m/s each second for 5.0 s. What is its final speed?
A pendulum completes 3 cycles in 12 seconds. What is its period?
Answer:
[tex]period = 4s[/tex]
Explanation:
[tex]period = \frac{total \: time}{number \: of \: cycles} [/tex]
[tex]period = \frac{12}{3} [/tex]
[tex]period = 4s[/tex]
Water flowing through a garden hose of diameter 2.74 cm fills a 25.0-liter bucket in 2.50 min. What is the volumetric flow rate?
How many kg of ice at 0°C must be added to 0.6kg of water at 100°C in an insulated 0.1kg copper container and its contents to 30°C? The specific heats of water and copper are 4.2 and 0.39 kJ/kgK, respectively; the heat of fusion of ice is 335 kJ/kg.
Answer:
.389 kg of ice required
Explanation:
The heat absorbed by melting the ice and warming it to 30 C
must be equal to the heat lost by cooling the existing water and the copper from 100 to 30 C
First, melt the ice (this occurs at a constant temperature)
x * 335 kj/kg and warm this water x * 4.2 kj/kg-k * 30 k
(x = kg of ice required)
then cool the copper and the .6 kg water from 100 to 30 C (70 degrees)
.1 kg * .39 * 70 K + .6kg * 4.2 kj/kg-K * 70 K
then equate the two amounts of heat
x ( 335 + 4.2 *30) = .1 * .39 * 70 + .6 * 4.2 * 70
solve for x = .389 kg
If in the figure below, the friction between the block and the incline is negligible, (a) how much must the object on the right weigh if the 200-N block is to remain at rest? Ans: 115 N (b) if the system remains at rest when F= 220 N. What are the magnitude and direction of the friction force on the 200-N block? Ans: 105 N down the incline 200 N Fw 35.0⁰
The magnitude of the acceleration and its direction however depends on the resultant force.
What is the resultant force?
In a system of forces, the resultant force is the force that has the same effect in magnitude and direction as all the forces acting together.
In an inclined plane, the friction, weight and applied force all act together on the object. The magnitude of the acceleration and its direction however depends on the resultant force.
This question is incomplete as the diagrams are missing hence the numerical values can not be computed.
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If the number of turns in a primary coil is 200 and the voltage is 120 V, then how many turns are needed in a secondary coil of a transformer to produce an output voltage of 24,000 V?
Np/Ns = Vp/Vs
200/Ns=120/24000
Ns=40,000