When an object in simple harmonic motion is at its maximum displacement, its acceleration is also at a maximum.
Reason: The speed is zero when the simple harmonic motion is at its maximum displacement, however, the acceleration is the rate of change of velocity. The velocity reverses the direction at that point therefore its rate of change is maximum at that moment. thus the acceleration is at its maximum at this point
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The shorter the wavelength the higher the frequency.
Answer:
The frequency of a wave is inversely proportional to its wavelength. This means that high frequency waves have a shorter wavelength, while low frequency waves have a longer wavelength. Light waves have very, very short wavelengths.
Explanation:
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 70kg bicyclist (including the bicycle) is pedaling right with a constant speed despite
experiencing a 50N drag. Neglect any friction impeding her motion.
What is the magnitude of the net force on the bicyclist?
How much force is her pedaling generating?
Answer:There are total four forces acting on the bicyclist namely, gravitational force, normal force, pushing force and air drag.
The magnitude of net force acting on the bicyclist is 165 N.
The required magnitude of force generated for the pedaling is of 225 N.
Given data:
The mass of bicyclist is, m = 75.0 kg.
The magnitude of acceleration is, .
The magnitude of drag force is, F = 60.0 N.
(1)
There are in total 4 forces acting on the bicyclist:
The gravitational force on the bicyclist, acting vertically downward, of magnitude , where m is the mass of the bicyclist and g is the acceleration due to gravityThe normal force exerted by the floor on the bicyclist and the bike, N, vertically upward, and of same magnitude as the gravitational forceThe force of push F", acting horizontally forward, given by the push exerted by the bicyclist on the pedalsThe air drag, F, of magnitude F = 60.0 N, acting horizontally backward, in the direction opposite to the motion of the bicyclist
(2)
The magnitude of net force acting on the bicyclist is given as,
Thus, the magnitude of net force acting on the bicyclist is 165 N.
(3)
We need to find the forward force of push, F'', which is actually the force generated during pedaling.
Then the expression for the forward pushing force F" is given as,
Thus, we can conclude that the force generated for the pedaling is of 225 N.
Explanation:
The magnitude of the net force on the bicyclist was 0 N.
Her pedaling is generating a force of 50 N in opposite of the drag force .
What is force?Force is defined in physics as: the push or pull on an object with mass that causes it to change velocity. Force is an external agent that can change the state of rest or motion of a body. It has a magnitude as well as a direction.
A spring balance can be used to calculate force.
As the bicyclist (including the bicycle) is pedaling right with a constant speed, the magnitude of the net force on the bicyclist was = mass × acceleration
= 70 kg × 0 m/s²
= 0 N.
Again her pedaling is generating a force = drag force = 50 N in opposite of the drag force . So that, net force on it becomes zero.
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PSYCHOLOGY
Which of these statements are false ?
Answer:
The false statement has to be that neruotransmitters are in the spinal cord.
Explanation:
Neruotransmitters are in no was associated with the spinal cord. That is more related to nerves and muscles. Neurotransmitters are in the Phasma Membrane acording to sciencedirect.com.
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
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 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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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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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:
A 24 volt battery is connected to a circuit with a 4- light bulbs that are connected in series. Resistance of each light bulb is 3 Ohms, a) What will be the current in the circuit
Answer:
Current = 2 amps
Explanation:
Remark
The voltage of the circuit is 24 volts.
The Resistance Series circuit is
Rt = B1 + B2 + B3 + B4B1 = B2 = B3 = B4 = 3 ohmsRt = 4*3 ohms = 12 ohms (each bulb has a resistance of 3 ohms each and there are four of them)Givens
E = 24 volts
R = 12 ohms
Formula
E = I * R where
E = voltageR = resistanceI = CurrentSolution
24 volts = 12 * I Divide by 12
24/12 = I
I = 2 amperes.
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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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
Who was known for being a pilot and an astronaut that walked on the moon?.
Answer:
Neil Armstrong was the astronaut
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.
What substance is oxidized as the battery discharges?.
Answer:
metallic lead
Explanation:
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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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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40
2. A ray of light shines from the Sun. Typically, it takes a little over 8 minutes to get from the Sun
to Earth. How much time (in seconds) would it take light to get from the Sun to the Earth (a
distance of 1.49 x 101^1 m) if we fill that space with Jello which has an index of refraction of 1.56?
Answer:
774.8 secs
Explanation:
distance(d)= speed(v)* time(t)
calculate speed:
refractive index = speed of light (c)/ speed of light in medium (v)
1.56 = 3*10^8*v
v=192307692.3 m/s
d = v *t
t = d/v
on substituting values:
t = 774.8 secs
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:
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.
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
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
What term refers to alternating waves of contraction and relaxation of the digestive tract that propel food along the tract?.
Which refers to solid ice that condenses and forms on surfaces like grass or windows?
Answer: Frost
Explanation: Frost is the deposition of ice, that develops after the freezing of the water vapor. It most commonly appears on the surfaces of the ground and can be observed as fragile crystals of ice. These can be observed on the window panes, blades of the grass, or any other solid exposed surface. The window frost develops when a pane of glass is exposed to below freezing temperature from the outer surrounding and the moist air from inside.
Answer: It is frost.
Explanation: I took the test on edge 2022.
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.
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 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.
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