Answer:
C
Explanation:
I would have to say C because the girl is constantly moving in the act of serving the volleyball.
A man lifts a 120 kg barbell 2 m above the ground . What is the gain in gravitational PE of the barbell?
Answer:
2,352 Joules
Explanation:
At the ground, the barbell has a classical mechanical energy value of zero. There is no classical kinetic or potential energy for the barbell. The moment the man starts to lift the barbell, he does work on the barbell and transfers kinetic energy to it due to the motion. At its maximum height where the man lifts the barbell to a stop, the kinetic energy is zero because it transformed into gravitational potential energy stored in the gravitational field. Our reference point for potential was defined to be zero at the floor, therefore we can say that the gravitational potential energy at 2 meters is:
[tex]U=mgh=(120kg)(9.8m/s^2)(2m)=2,352J[/tex]
A 1500 kg car travels at 25 m/s and then quickly stops in 3.5 s to avoid an obstacle. What is the Initial Momentum of the car'
Answer:
3750 kg m/s
Explanation:
momentum = mv = 1500 * 2.5 = 3750 kg m/s
Astronomers have found that there is more helium in the universe than stars could have made in the 13.8 billion years that the universe has been in existence. How does the Big Bang scenario solve this problem
Big Bang scenario solves the problem of astronomers, as they found that there is more helium in the universe than stars and this is explained by the Big Bang scenario by saying that the fusion time elapsed the helium remained without forming stars
What is Big Bang scenario?Generally, According to the Big Bang theory, all current and matter in the Universe came into being at the same time, around 13.8 billion years in the past.
In conclusion, The fusion time elapsed after 3 to 4 mins.
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In an electromagnetic wave in free space, the electric and magnetic fields are.
Answer:
PERPENDICULAR
Explanation:
HOPE IT HELPSWithin how many hours must cooked tcs food be cooled from 135 to 70.
TCS food must be cooled from 135 °F to 70 °F in two hours . Milk and egg are the example of the tcs food.
What is temperature?Temperature directs the hotness or coldness of a body. Faster the motion of particles, more the temperature.
Raw, cooked, or partially cooked animal products such as eggs, milk, meat, or fowl. Rice, potatoes, and pasta are examples of cooked plant-based foods.
Raw seed sprouts, sliced melons, cut tomatoes, and cut leafy greens are examples of plant-based foods.
TCS food must be cooled from 135 °F to 70 °F in two hours and to 41 °F or below in six hours.
Hence,TCS food must be cooled from 135 °F to 70 °F in two hours
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Which of the following could occur the net force acting on a truck is zero
Answer:
No net force means the truck reamains at rest or the motion of the truck does not change.
Explanation:
What term refers to alternating waves of contraction and relaxation of the digestive tract that propel food along the tract?.
Fahrenheit scale? What will be the temperature reading in Fahrenheit scale when the reading is 310 K?
Please this is urgent. Answer this question as soon as possible. Thank You.
Explanation:
[tex](k - 273.15) \times \frac{9}{5} + 32 = f [/tex]
[tex]310 - 273.15 \times \frac{9}{5} + 32 = f[/tex]
[tex]98.33 = f[/tex]
[tex]36.85 \times \frac{9}{5} + 32 = f[/tex]
Answer:
98.33 F
Explanation:
Convert to C degrees from 310 K
310 - 273.15 = 36.85 C
convert from 36.85 C to F degrees
9/5 (36.85) + 32 = 98.33 F degrees
An 8. 0 meter long ocean wave passes the end of a dock every 5. 0 seconds. Calculate the speed of the
wave.
The speed of the ocean wave is 1.6 m/s.
What is speed?Speed can be defined as the rate of change in distance.
To calculate the speed of the ocean wave, we use the formula below
Formula:
V = d/t............ Equation 1Where:
V = Velocity of the ocean waved = Total distance covered by the wave t = Time taken to cover the distanceFrom the question,
Given:
d = 8 mt = 5 secondsSubstitute these values into equation 1
V = 8/5V = 1.6 m/sHence, The speed of the ocean wave is 1.6 m/s.
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4. A 3 kg book sits on a 2 m high shelf. How much kinetic and potential
energy does the book have
Answer:
Kinetic energy = 0 and Potential Energy = 29.4J
What must have been the velocity of a 250 kg car that has 18000 J of energy?
Answer:
12 m/s
Explanation:
Given,
Kinetic energy ( K.E ) = 18000 J
Mass ( m ) = 250 kg
To find : Velocity ( v )
Formula : -
K.E = mv²/2
v² = 2 K.E / m
= 2 x 18000 / 250
= 2 x 72
= 144
= 12 x 12
v² = 12²
v = 12 m/s
Therefore,
the velocity of the car is 12 m/s
Which event is part of a covection current in the air?
Answer:
As you must know, Convection Current is the transfer of heat by actual movement of molecules from a hot to cold place due to difference in densities. Thus, the phenomenon of convection current is also observed in nature, for example the Land and Sea Breezes help in keeping the temperature moderate in coastal areas. Convection current in air also helps the birds and gliders to stay in air for a long period.
hope that helps...
students in a lab are doing experiments involving the motion of objects. they pull an object across a table and use a detector to measure the acceleration of the object for the entire time they pull it. The graph shows the data from the detector, with four segments labeled
The segment of the motion that net force act on the object causing a positive acceleration is segment 1.
Motion of an objectThe motion of an object occurs when a net force greater than zero acts on the object.
The force on the object is determined from Newton's second law of motion.
F(net) = ma
where;
m is mass of the objecta is acceleration of the objectAcceleration of the object from the graphSegment 1: the acceleration is positiveSegment 2: the acceleration is zeroSegment 3: the acceleration is negativeSegment 4: the acceleration is zeroThus, the segment of the motion that net force act on the object causing a positive acceleration is segment 1.
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1. Write the advantages and disadvantages of connecting lamps (a) in series and (b) in parallel. A3 2. a) 0.2A Draw Fig 5.30 into your exercise book and name the way in which the lamps are connected and answer questions b and c A₂ b) If A3 read 0.2A, what do the other two ammeters read? A1 c) If one of the lamps is removed explain what would happen to the other lamp. Fig 5.30 Reading of ammeter in series circuit
Answer:
parallel connection:Advandages: 1. Every unit that is connected in a parallel circuit gets equal amount of voltage.2. It becomes easy to connect or disconnect a new element without affecting the working of other elements.3. If any fault happened to the circuit, then also the current is able to pass through the circuit through different paths.Disadvantages: 1. It requires the use of lot of wires.2. We cannot increase or multiply the voltage in a parallel circuit.3. Parallel connection fails at the time when it is required to pass exactly same amount of current through the units.series connection:Advantages: 1. Series circuits do not overheat easily. This makes them very useful in the case of something that might be around a potentially flammable source, like dry plants or cloth.2. Series circuits are easy to learn and to make. Their simple design is easy to understand, and this means that it’s simple to conduct repairs .3. we can add more power devices, they have a higher output in terms of voltage .4. The current that flows in a series circuit has to flow through every component in the circuit. Therefore, all of the components in a series connection carry the same current.Disadvantages: 1.If one point breaks in the series circuit,the total circuit will break.2. As the number of components in a circuit increases ,greater will be the circuit resistance.
Who was known for being a pilot and an astronaut that walked on the moon?.
Answer:
Neil Armstrong was the astronaut
Use the drop-down menu to answer the question. a student is going to produce static charge in a glass rod by rubbing it with a piece of silk. which method of transferring charge does this image illustrate?
Answer:
The second answer is friction. In other words the second answer.
Explanation:
The correct answer to the question is Friction. Friction is responsible to produce a static charge in a glass rod by rubbing it with a piece of silk.
What is friction?Before answering this question, first we have to understand the process of charging a body by friction.
There are generally three modes of charging a body which are known as friction, induction and conduction respectively.
Friction: Friction is the mode of charging a body by direct contact through rubbing with another substance.
In this process, a low electron affinity substance is rubbed with a high electron affinity substance. The low electron affinity substance will lose electron, and acquires positive charge.
On the other hand, the high electron affinity substance will gain electrons, and gets negatively charged .
Hence, there is actual transfer of electrons from one body to another body in the process of charging a body through friction.
As per the question, the glass rod is rubbed with silk. Due this rubbing,static electricity will be developed on the glass rod and silk.
Hence, it is obvious that the glass rod gains static charge due to the process of friction.
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What is the minimum size copper equipment grounding conductor required to serve a multi section motor control center equipped with a 300-amp over current device
The minimum size copper equipment grounding conductor that is required is ; #4 copper
Equipment grounding conductorAn Equipment grounding conductor is a conductive part of ground fault current path which connects the non-conducting metallic parts of the euipment together and also connects the system grounded conductor.
For a copper euipment grounding conductor required to serve a control center connected to a 300 amp over current device the minimum size of copper is #4 copper
Hence we can conclude that The minimum size copper equipment grounding conductor that is required is ; #4 copper.
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How long does it take a radio signal from Earth to reach the Moon, which has an orbital radius of approximately 3.8410 m
Answer:
2.4 to 2.7 seconds
Radio waves propagate in vacuum at the speed of light c, exactly 299,792,458 m/s. Propagation time to the Moon and back ranges from 2.4 to 2.7 seconds, with an average of 2.56 seconds (the average distance from Earth to the Moon is 384,400 km).
Explanation:
no explanation.
NEEDED ASAP
Many car insurance companies consider drivers under the age of 25 __ for vehicle-related collisions.
A. a lower-than-average risk
B. a higher-than-average risk
C. an average risk
Answer:
B
Explanation:
Inexperienced drivers are higher risk
Answer:b
Explanation:a higher-than-average risk
Which substance does not produce carbon dioxide when reacted with acid?
Answer:
It is lime. Basically, the lime is kinda too weak for it to produce. Thats what I remember my teacher saying. Hope this helps!
Explanation:
Which transition by an electron will release the greatest amount of energy? a b c d
The electron of orbital a by transition will release the greatest amount of energy.
What is transition energy?Atomic electron transition is a change (or jump) of an electron from one energy level to another within an atom or artificial atom.
It appears discontinuous as the electron "jumps" from one quantized energy level to another, typically in a few nanoseconds or less.
It is also known as an electronic (de-)excitation or atomic transition or quantum jump.
Electron transitions cause the emission or absorption of electromagnetic radiation in the form of quantized units called photons. Their statistics are Poissonian, and the time between jumps is exponentially distributed.
The damping time constant (which ranges from nanoseconds to a few seconds) relates to the natural, pressure, and field broadening of spectral lines.
The larger the energy separation of the states between which the electron jumps, the shorter the wavelength of the photon emitted.
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Use the drop-down menu to answer the question. according to "take a closer look", what type of lens is used to correct nearsightedness?
Answer: concave lens
Explanation:
Answer:
A or convex lens
Explanation:
Paula has 4 2/3 yards of ribbon. She cuts 4 inches off each end of the ribbon to remove the frayed ends. She divides the remaining ribbon into 16 equal pieces to make bows. What is the length of ribbon, in inches, used to make each bow?
Answer:
Each ribbon = 10 inches
Explanation:
Each yard = 36 inches
4 2/3 * 36 = 168 inches now cut off 8 inches
160 inches
now make 16 ribbons 160 / 16 = 10 inches
Rank the five terrestrial worlds in order of size from smallest to largest: Group of answer choices Mercury, Venus, Earth, Moon, Mars. Mercury, Moon, Venus, Earth, Mars. Moon, Mercury, Venus, Earth, Mars. Moon, Mercury, Mars, Venus, Earth. Mercury, Moon, Mars, Earth, Venus.
Answer: Moon, Mercury, Mars, Venus, Earth
Explanation:
Ram and Ajay are trying to move a heavy box. Ram is applying 100N and Ajay is
applying 60N in the same direction.
a. What is the net force applied to the box?
b. In which direction the box moves?
WILL MARK S BRAINLIEST PLEASE ANSWER FAST
Answer:
a. 100N +60N =160N
b. . the box will move in the direction the force is applied.
Of the three sciences, physics, chemistry, and biology, the most complex is
A. physics because it involves many mathematical equations.
B. chemistry because there are so many possible combinations of atoms.
C. biology because it is based upon both the laws of chemistry and physics.
D. All three of these sciences are equally complex.
Answer:
I would probably say C to be completely honest
Explanation:
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Write a hypothesis about how the number of half-lives affects the number of radioactive atoms. use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "how does the number of radioactive atoms change over time?"
Answer:
If the number of half-lives increases, then the number of radioactive atoms decreases, because about half of the atoms'nuclei decay with each half life.
According to our theory of solar system formation, why do we find some exceptions to the general rules and patterns of the planets?.
A point charge of 5.7 µc moves at 4.5 × 105 m/s in a magnetic field that has a field strength of 3.2 mt, as shown in the diagram. a field of circles labeled b. there is a positively charged particle with a velocity vector pointing 37 degrees north of east labeled v. what is the magnitude of the magnetic force acting on the charge? 6.6 × 10–3 n 4.9 × 10–3 n 4.9 × 103 n 6.6 × 103 n
The magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N
What is magnetic force?Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion.The magnitude of the magnetic force acting on the charge is given by:
[tex]\rm F=qvBsin\theta[/tex]
where
The magnitude of the charge [tex]q=5.7\ \mu C =5.7\times 10^{-6} \ C[/tex]
The velocity of the charge [tex]v=4.5\times 10^5\ \frac{m}{s}[/tex]
The magnitude of the magnetic field [tex]3.2\ mT=0.0032\ T[/tex]
The angle between the directions of v and B [tex]\theta =90^o-37^o=53^o[/tex]
By substituting the values we will get:
[tex]F=(5.7\times 10^}-6})(4.5\times 10^5)(0.0032)(Sin53^o)[/tex]
[tex]F=6.6\times 10^{-3}\ N[/tex]
Hence the magnitude of the force on the charge by the influence of the magnetic field will be 6.6*10^-3 N
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Answer:
a - on edge
Explanation:
yes
What substance is oxidized as the battery discharges?.
Answer:
metallic lead
Explanation: