Answer:
The minimum amount should be 30 minutes three times a week.
Explanation:
How does the value and direction of the restoring force change as the spring constant or displacement is changed?
Answer:
The effect of gravity is only to shift the equilibrium point, so at equilibrium (at rest), a vertical spring will be extended as compared with the same spring in a horizontal position. But this does not affect the period.
As the spring constant or displacement is changed, the value and direction of the restoring force change, and they are always toward the equilibrium position of the spring when it is stretched.
What is the significance of the restoring force?When an object is relaxed or stretched, it is responsible for returning it to its original equilibrium position, such as a spring when stretched, and the force is directly proportional to the displacement and acts in the opposite direction of the displacement, the restoring force is responsible for the oscillations and waves, and its properties.
Hence, as the spring constant or displacement is changed, the value and direction of the restoring force change, and they are always toward the equilibrium position of the spring when it is stretched.
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A 40.0 kg box is placed on a 2.00 m tall shelf. If the box falls off the shelf, what is its kinetic energy as it strikes the ground?
001)
9. A ball is rolled at a velocity of 12 m/s. After 36 seconds, it comes to a stop. What is the acceleration of the ball?
Answer:
0.33333333333
Explanation:
a = v/t
= 12/36
= 1/3
= 0.3333
Answer:
3
Explain
36/12
The heat from the sun travels to Earth___
A. In high-frequency waves
B.In low frequency-waves
C.Through the movement of molecules
D.By conduction and convention
Answer:
a in high frequency waves
Explanation:
because of the thermal radiation from the sun
Answer:
The answer is B, "In low frequency-waves"
Explanation:
I got this right on my lesson! Have a great day! (-;
value of x
Guys plz answer
and get marked as brainliest :)
Answer:
80⁰
Explanation:
triangle AOB = 180
So, a = 50
triangle CAB = a+a+x=180
CAB = 50+50+X=180
CAB = X = 180-100
X=80
HOPE IT HELPS
Answer:
Explanation:
Since OA = OB (Radius of a circle)
angle OAB = angle OBA = 50
I'm not sure what to do beyond this...
I hope this piece of information was helpful.
what happens as photons of visible light are absorbed by dye molecules?
How does an air mattress protect a stunt person landing on the ground after a stunt?
Answer:
a) It reduces the kinetic energy loss of the stunt person.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
What is air mattress?An air mattress is an inflated mattress composed of polyvinyl chloride (PVC) and textile-reinforced urethane plastic and rubber. It is also known as an airbed or even a blow-up bed. Deflated mattresses may be compressed and transported and stored in a tiny size.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls or if it is thrown from a great height. This shields the stunt performer from catastrophic dangers like shattered bones or concussions.
Therefore, an air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
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13. A glass of water left in the sun becomes warm. Estella adds ice to the water to make
it cool. What energy change occurs when ice is added to the warm drink?
Answer:
second
Explanation:
second
If an object has a velocity of 15 m/s and a momentum of 30 kg m/s, what is its mass?
Answer:
30kgm/s/15m/s=2kg
Explanation:mass=momentum/velocity
The mass of the object is 2 kg.
What is momentum?The product of a particle's mass and velocity is its momentum. Momentum is a vector quantity, meaning it has both magnitude and direction. According to Isaac Newton's second equation of motion, the force acting on a particle equals the time rate of change of momentum.
Given that:
Velocity of the object: v = 15 m/s.
Momentum of the object: p = 30 kg m/s.
Let the mass of the object = m.
From the definition of momentum; we get:
momentum = mass × velocity
30 = 15 m
m = 2 kg.
Hence, mass of it is 2 kg.
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Write two characteristics of an educated society
Answer:
Different and better?
Explanation:
i dont think that helps lol
An educated person has the ability to think clearly and independently and has good judgement.
What is Education?Education is defined as purposeful activity directed towards achieving some objective, such as the dissemination of knowledge or the promotion of skills and character traits, whose aims include the development of understanding, rationality, kindness and honesty.
There are three main types of education which are as follows:
Formal, Informal and Non-formal.
The specialty of education is that it is pre-determined and pre-planned. It is regular and spatial i.e. time bound and regulated by the institutional. Proper education improves people's understanding of the world around them which make them less susceptible to the influence of others
Thus, an educated person has the ability to think clearly and independently and has good judgement.
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write down the expressions for the heat produced per second in a resistor in terms of current and resistance
Answer:
Heat,[tex]H=I^2 R[/tex]
Explanation:
Let H be the heat produced
Time, t=1 sec
I=Current
R=Resistance of resistor
We have to write down the expressions for the heat produced per second in a resistor in terms of current and resistance.
We know that
Heat, [tex]H=I^2 Rt[/tex]
Using the formula
Heat,[tex]H=I^2R\times 1[/tex]
Heat,[tex]H=I^2 R[/tex]
Hence, the the expressions for the heat produced per second in a resistor in terms of current and resistance is given by
Heat,[tex]H=I^2 R[/tex]
Why is it safer to collide with a soft cushion than a hard surface?
Answer:
Impulse is force multiplied by time; and together, the product must be 1 unit. A collision with soft ground will result in the 1 unit of impulse by a larger time and a smaller force (compared to the small time and a large force for the hard floor).
Why is an electromagnet used instead of a permanent magnet in magnetic cranes?
Answer:
an electromagnet is a metal which has the ability to turn into a magnet on passing electricity through it .
But once the electric flow is withdrawn the circuit breaks and it no more behaves like a magnet.
but this is not so in permanent magnets
Explanation:
thus electromagnet is used in magnetic cranes bcoz their magnetism can be controlled conveniently.
two homogeneous bodies of the same volume
Answer:
No, it is not necessary for them to have same mass.
Explanation:
Let both bodies have a density d1 and d2 respectively.
Since their volumes are equal V1 = V2
we know that, https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D
Hence, d1 = and d2 =
Taking the ratio of densities,we get
This implies that unless the bodies have same densities, the mass of the two bodies will not be same.
An electric iron is connected to the mains power supply of 220 V. When the electric iron is
adjusted at 'minimum heating' it consumes a power of 360 W but at 'maximum heating' it takes a
power of 840 W. Calculate the current and resistance in each case.
Answer:
Given: V = 220V, Pmin = 360W, Pmax = 840W
For minimum heating case:
We know that
Pmin = VI
360 = 220 X I
I = 1.63 amp
R = V/I
R = 220/1.63
R = 134.96ohms
For maximum heating case:
We know that
Pmax = VI
840 = 220 X I
I = 3.81 amp
R = V/I
R = 220/3.81
R = 57.74 ohms
Newton’s first law of motion states that an object's motion remains the same unless a force acts upon it. What would be an example of this law in action?
Answer:
A driver breaks suddenly and the passengers are flung forward
The acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the
ball. This example best illustrates what law?
A.Newton's first law of motion
B.Newton's second law of motion
C.Newton's third law of motion
D.Newton's law of universal gravitation
Answer:
B. Newton's second law of motion
Explanation:
Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.
Mathematically, it is given by the formula;
[tex] Net \; Force = mass * acceleration [/tex]
Making acceleration the subject of formula, we have;
[tex] Acceleration = \frac {Net \; Force}{Mass} [/tex]
In this scenario, the acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the ball. Thus, this example best illustrates Newton's second law of motion.
The brakes of a lorry are in a poor condition
What effect will the condition of the brakes have on thinking distance and the braking
distance of the lorry?
Answer:
friction
Explanation:
Her brakes will squeak and possibly slide or skid on concrete due to her brakes.
BUT it really depends on the condition of the wheels. Now it matters on the surface as well. Has the road been eroded? what has happened with her brakes? and what texture are the wheels? can seismic waves travel through them?
Answer:
thinking distance stays the same and the braking distance increases
AQA Approved.✅
Explanation:
A 8-kg load stretches an elastic belt 0.02 m. How much will a 12-kg load stretch the belt?
Answer:
0.06
Explanation:
a 6 load will be 0.03 so double it to get the answer which is 0.06
2. a) A student obtained ice at 0°C from a refrigerator and placed it in a beaker on a
bench. After 4 minutes, the temperature rose to 4°C. State the changes that would be observed in the water in terms of;
(i) volume
(ii) mass
(iii) density
(b) Sketch a graph of density against temperature if the ice is warmed from 0°C to
8°C.
Answer:
2 4
Explanation:
because
What is the blank? (physics)
The total energy of a system is equal to the energy added to the system plus the work and the ____ that is produced.
Answer:
Heat???
Sorry I am not at all sure
The location where an earthquake begins
A. Strike-Slip fault
B. Epicenter
C. Focus
D. Seismogram
Answer:
b
Explanation:
the location where an earthquake begin is called
Which vector is the sum of the vectors shown below?
Need help as fast as possible please
I will mark BRAINLIST only for correct answers babes :)
Thank you!
Are stairs a type of inclined plane?
Answer:
Inclined planes are simple machines used to make work easier. Ramps, ladders, and staircases are all inclined planes.
Explanation:
Answer:
imma say yes
Explanation:
Work out the current through a television with a power of 0.8 kW if it uses the 230 V mains supply. Give your answer to 1 decimal place.
Answer:
the current is 3.5 A
Explanation:
The computation of the current is shown below:
As we know that
Current [A] = Electrical power [W] ÷ Potential difference [V]
Now convert KW TO W = × 1000
So, the current is
= 800W ÷ 230V
= 3.5 A
Hence, the current is 3.5 A
pleaseeeeeeeeee helpppppppppppppppp
Anyone able to help with these questions, will give brainliest to first correct anwser
Answer:
b
Explanation:
I did this question earlier
an object that is accelerating may be
It must be either speeding up, or slowing down, or turning. There are no other possibilities.
What happens when an object becomes cold?
Energy is added to it.
Mass is removed from it.
Cold is added to it.
Heat is removed from it.
Answer:
Heat is removed from it.
Explanation:
A object will become cold when it loses its heat to its surroundings. I would look up the 3 Principles of Heat Transfer.
I hope this helped! :)
