The estimated value of mass is 0.2625066 units
Given , Force =3.5N , time=0.15sec =15/100 sec
Velocity=2 m/s, mass =?
In Physics Acceleration means rate of change of velocity, i.e. Mathematically, a= v/t
a= 2/0.15
a=200/15= 13.333m/s²
In Physics Force means product of mass and acceleration i.e. F=ma
From this equation we can deduce the value of mass of the object.
3.5N= m [13.333]
m=3.5/13.333
m= 0.2625066
Hence forth in this way the value of mass is computed.
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A Car Starts from rest and accelerate at the rate of
5m/s' for 8 See It then travels at this speed for another lasse
fer which it was brought to rest in 4sec:
The maximum velocity attained by the car
the time taken to cover the first 18seconds
Calculate the average speed of the Car
When a car is at rest, it begins to accelerate at a pace of 8 Sec at 5 m/s It then continues moving at same speed for another lap after coming to rest in 4 seconds.
The maximum velocity attained by the car, the velocity would be 8m/s.
Initial velocity, u= 0m/s
Distance travelled in 8 sec would be
s= u ×t+ 1/2at²
= 1/2 ×5 ×(8)²
= 160m
Velocity after t= 4sec
= 2×4= 8m/s
What is average velocity?Average velocity is defined as the change in position or displacement (x) divided by the time intervals (t) during which the change occurs. Based on the direction of the displacement, the average velocity might either be positive or negative. The unit of measure for average velocity in the SI is meters per second (m/s or ms-1).
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What ,begin emphasis,two,end emphasis, actions will ,begin emphasis,best,end emphasis, help people in Cape Town lessen the water shortage problem?
The following actions will help people in Cape Town to lessen the water shortage problem.
Diversifying the municipal water portfolio with water recycling, The desalination processUse of groundwater can reduce risk of water shortages due to droughtWhat is drought?A drought is described as a moisture deficit relative to the average water availability at a given location and season. A drought is also defined as drier than normal conditions.
Water shortage is becoming an increasing threat in Cape town because of climate change impacts which includes changing rainfall patterns and rising temperatures and increasing water demand.
In summary, the city of Cape town can develop engineering dams and 'importing' water through inter-basin transfer schemes to help in fighting drought.
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The mass of the sun is 1.99 x 1030 kg. The distance from the sun to Earth is 6.96 x 108 m.
How fast would you need to travel to escape the gravitational pull of the sun?
Use Newton’s law of universal gravitation.
F = Gm1m2/r^2
(Force) F= Newtons
G is the “Universal Gravitational Constant”. G = 6.67 × 10^-11 N m^2 kg^-2
M1 is the first mass, the Sun. Mass of the Sun = 2 x 10^30 kg
M2 is the second mass, the Earth. Mass of the Earth = 6 x 10^24 kg
DR is the distance between the two objects. Distance from the Earth to the Sun = 1.5 x 10^11 metres
F = Gm1m2/r^2
F = G x 2 x 10^30 x 6 x 10^24/ [1.5 x 10^11] ^2 = 6.7 x 10^11 N
The mass of a planet is 10¹⁸ kg and its radius is 10³ m. Calculate the acceleration due to gravity on its surface. Use the known value of G. [6.673×10^-11 N m² kg^-2]
[tex]g = \frac{GM}{r {}^{2} } \\ g = \frac{6.673 \times 10 {}^{ - 11} \times 10 {}^{18} }{(10 {}^{3}) {}^{2} } \\ g = \frac{6.673 \times 10 {}^{7} }{10 {}^{6} } \\ g = 6.673 \times 10 \\ g = 66.73 \: m.s {}^{ - 2} [/tex]
If your actual mechanical advantage is 70 J, and the theoretical is 100 J, what is your percent efficiency?
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A solid, horizontal cylinder of mass 12.2 kg and radius 1.00 m rotates with an angular speed of 5.50 rad/s about a fixed vertical axis through its center. A 0.250-kg piece of putty is
dropped vertically onto the cylinder at a point 0.900 m from the center of rotation and sticks to the cylinder. Determine the final angular speed of the system.
rad/s
PRACTICE ANOTHER
The final angular speed of the system that contains a solid, horizontal cylinder of mass 12.2 kg and radius 1.00 m rotates with an angular speed of 5.50 rad/s about a fixed vertical axis through its center is 5.33 rad / s
Let M and R be mass and radius of the cylinder. Let m and r be mass and distance of piece of putty.
M = 12.2 kg
R = 1 m
ω = 5.5 rad / s
m = 0.25 kg
r = 0.9 m
According to law of conservation of angular momentum,
1 / 2 M R² ω = ( 1 / 2 M R² + m r² ) ω'
1 / 2 * 12.2 * 1 * 5.5 = [ ( 1 / 2 * 12.2 * 1 ) + ( 0.25 * 0.9² ) ] ω'
ω' = 33.55 / 6.3
ω' = 5.33 rad / s
Therefore, the final angular speed of the system is 5.33 rad / s
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Johnny lets a 0.5 kg ball roll on the floor of the classroom. The ball gradually slows down. Draw a free body diagram and calculate the acceleration of the ball
The free body diagram of the ball as shown shows al the forces that acts on the ball as it rolls on the floor.
What is the free body diagram of the ball?We know that a free body diagram is the diagram that shows the forces that act on an object. Force is a vector quantity thus we must consider the magnitude and the direction of the force. An object can be acted upon by a system of forces. The system of forces would only cause the object to move when the forces are unbalanced. If the system of forces is balanced, the object would not move at all.
In this case, we have a ball that is rolling on a floor. There are four main forces that are acting on the ball as we can see from the free body diagram. These are;
1) The weight of the ball that acts downwards
2) The normal reaction that acts upwards
3) The force that moves the ball forward
4) The force of friction that resists the forward motion of the ball.
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A 10 kg object is on a movable platform. Rank the size of the normal force acting on the object from largest to smallest.
a) The object is at rest and the platform is not moving
b) the object is at rest on the stationary platform and there is a downward force of 10N applied to the top of the object while it remains stationary
c) the object is at rest on the stationary platform and there is an upward force of 10N applied to the top of the object while it remains stationary
d) the platform is accelerating the object upward at 1.5 m/s^2
e) the platform is accelerating the object downward at 0.5 m/s^2
The size of the normal force acting on the object from largest to smallest are;
(b) The object is at rest on the stationary platform and there is a downward force of 10N applied to the top of the object while it remains stationary.
(e) The platform is accelerating the object downward at 0.5 m/s^2.
(a) The object is at rest and the platform is not moving.
(c) The object is at rest on the stationary platform and there is an upward force of 10N applied to the top of the object while it remains stationary
(d) the platform is accelerating the object upward at 1.5 m/s^2.
What is normal force?
The normal force of an object is the upward force exerted on the object by the supporting surface due to weight of the object acting downwards.
The formula for normal force is given as;
Fn = mg
where;
m is mass of the objectg is acceleration due to gravityThe normal force on the 10 kg object when it is at rest and the platform is not moving,
Fn = mg
Fn = 10 x 9.8
Fn = 98 N
When the object is at rest on the stationary platform and there is a downward force of 10N applied to the top of the object while it remains stationary,
Fn = (10 x 9.8) + 10 N
Fn = 108 N
When the object is at rest on the stationary platform and there is a upward force of 10N applied to the top of the object while it remains stationary,
Fn = (10 x 9.8) - 10 N
Fn = 88 N
When the platform is accelerating the object upward at 1.5 m/s^2
Fn = (10 x 9.8) - (1.5 x 10)
Fn = 98 N - 15 N
Fn = 83 N
When the platform is accelerating the object downward at 1.5 m/s^2
Fn = (10 x 9.8) + (10 x 0.5)
Fn = 103 N
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A cart is sliding across a horizontal floor. It has a mass of 25 kg and a force of 250 N. Using Newton's second law, a = F ÷ m, what is the acceleration of the cart?
0.1 m/s2
5 m/s2
10 m/s2
25 m/s2
Answer:
10m/s2
Explanation:
250/25=10
You hold a 0.125 kg glider A and a 0.500 kg glider B at rest on an air track with a compressed spring of negligible mass between them. When you release the gliders, the spring pushes them apart so that they move in opposite directions. When glider A has moved 0.960 m to the left from its starting position, how far to the right from its starting position has glider B moved?
Technology has changed and continues to change the way we live our lives, directly affecting our health and wellness. List three ways that modern technology has enhanced people’s health and three ways that it has diminished their health. Address personal, family, and community health. Do you believe that the good outweighs the bad? Why or why not?
Advanced medicine, good healthcare and easy diagnose are three ways that modern technology has enhanced people’s health
Technology has changed how individuals go about their daily lives. Practically every action you take, including regular work and conversation, is affected by it. Thanks to technology, carrying out tasks around the house or going to work has become easier. Many gadgets and pieces of equipment make it easier for people to live. Transportation, education, and medicine are just a few of the societal fields it has affected.
Another significant benefit of technology in people's lives is the modernization of the healthcare industry. The days of waiting in an outpatient department queue for hours to see a doctor are long gone. Patients may schedule hospital visits and look up the business hours of their doctors' offices using mobile devices.
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The form of energy found in moving objects is ___??
Answer:
kinetic energy
Explanation:
It is kinetic energy because it is an energy in motion. In order words it is an energy which the body or object moves.
The total energy of a system remains___.
Answer:
It remains Stationary
Explanation:
stationary.
A ball is projected with an initial velocity 50m/s at an angle 30 degree from the top of a tower 55m high.calculate the total time the ball was on the air and the maximum horizontal distance
Time of flight = 1.6 s
Horizontal distance = 64 m
What is a projectile motion?Projectile motion is the form of motion experienced by an object or particle projected into a gravitational field, such as from the surface of the Earth, and moves along a curvilinear path only under the action of gravity.
For the given case,
h = vt + ¹/₂gt²
h = height of tower
v = initial velocity
t = time of flight
55 = 50sin30t + ¹/₂9.8t²
55 = 25t + 4.9t²
4.9t² + 25t - 55 = 0
t = 1.6 s
X = vₓt
X = horizontal distance
vₓ = horizontal velocity
t = time of flight
X = (50 x cos30) x 1.6
X = 64 m
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what is the conclusion of a simple pendulum experiment
The surprising conclusion - the pendulum traverses a longer distance in a shorter time, than in a shorter distance, and its period is shorter.
The term "force" has a specific meaning in science. At this level, it is quite acceptable to refer to a force as a push or a pull. A force is not something that an object 'has in it.' Another object applies a force to another. The concept of a force is not limited to living or nonliving things.
The goal of this experiment is to quantify gravity's acceleration using a physical pendulum. A basic pendulum is described as a point mass connected to a massless unstretchable string connected to a rigid support. Mechanical energy is conserved in a simple pendulum with no friction. Total mechanical energy is the sum of kinetic and gravitational potential energy. There is a continual interchange of kinetic energy and gravitational potential energy as the pendulum swings back and forth.
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Find the y-component of this
vector:
47.3 m
39.4°
Answer: 36.55
Explanation:
Answer:it is 30.03
Explanation:
Part A
Calculate the maximum increase in photon wavelength that can occur during Compton scattering.
Express your answer to three significant figures and include the appropriate units.
AA max = 4.85x10-12 m
What is the energy of the smallest-energy X-ray photon for which Compton scattering could result in doubling the original wavelength?
Express your answer in megaelectronvolts to three significant figures.
The electron receives some of the energy that belongs to the photon. If an object's energy declines, its frequency and wavelength get longer.
What is Compton effect?When a photon with energy hf collides with an electron that is stationary, compelling proof that light is composed of particles (photons) and that photons have momentum is produced. Although the electron receives a portion of the energy and momentum (the Compton effect), the energy and momentum are conserved in this elastic collision. The photon possesses hf/ energy following the collision, while the electron has K kinetic energy.
Energy is conserved as follows: hf = hf/ + K
Combining this with the momentum conservation formulae, the following equation may be used to demonstrate the relationship between the wavelengths of the incident and emitted photons:
Δλ = λ/ - λ = (h/mec) (1 - cosθ)
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A light ray travelling from diamond into air has an angle of refraction of 56. A piece of glass is then placed right next to the diamond. Explain how the angle of refraction will change now that the light is moving from diamond into glass instead of air
The angle of refraction of a light ray travelling from diamond into air has an angle of refraction of 56 will decrease now that the light is moving from diamond into glass instead of air.
When a light ray travels from rarer medium to a denser medium, the refracted ray tends to move towards the normal. So angle of refraction < angle of incidence. When a light ray travels from denser medium to a rarer medium, the refracted ray tends to move away from the normal. So angle of refraction > angle of incidence.
Glass is denser than air. So the angle of refraction will be higher for air than the angle of refraction of glass. So, when the medium is changed from air to glass, the angle of refraction will decrease.
Therefore, the angle of refraction of a light ray travelling from diamond into air has an angle of refraction of 56 will decrease now that the light is moving from diamond into glass instead of air.
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match each burn type with an appropriate treatment
Answer:
Burn symptoms vary depending on the severity or degree of the burn. Symptoms are often worse during the first few hours or days after the burn. Burn symptoms include:
Blisters.
Pain.
Swelling.
White or charred (black) skin.
Peeling skin.
Explanation:
How are burns managed or treated?
Burn treatment varies depending on the cause and severity. You need to keep all burns clean and apply proper bandages/dressing depending on the severity of the wounds. Treating the person’s pain is key: inadequate control can interfere with wound care.
Continue to check wounds for signs of infection and other long term issues, such as scarring and tightening of the skin over joints and muscles, which makes them difficult to move.
Treatments by burn type include:
First-degree burns: Run cool water over the burn. Don’t apply ice. For sunburns, apply aloe vera gel. For thermal burns, apply antibiotic cream and cover lightly with gauze. You can also take over-the-counter pain medication.
Second-degree burns: Treatment for second and first-degree burns is similar. Your healthcare provider may prescribe a stronger antibiotic cream that contains silver, such as silver sulfadiazine, to kill bacteria. Elevating the burned area can reduce pain and swelling.
Third-degree burns: Third-degree burns can be life-threatening and often require skin grafts. Skin grafts replace damaged tissue with healthy skin from another of uninjured part of the person’s body. The area where the skin graft is taken from generally heals on its own. If the person does not have enough skin available for graft at the time of injury, a temporary source of graft can come from a deceased donor or a human-made (artificial) source but these will eventually need to be replaced by the person’s own skin. Treatment also includes extra fluids (usually given intravenously, with an IV) to keep blood pressure steady and prevent shock and dehydration.
Third-degree burns that are deep and affect a large portion of the skin are very serious and can be life-threatening. Even first- and second-degree burns can become infected and cause discolouration and scarring. First-degree burns don’t cause scarring.
Potential complications of third-degree burns include:
Arrhythmia, or heart rhythm disturbances, is caused by an electrical burn.
Dehydration.
Disfiguring scars and contractures.
Oedema (excess fluid and swelling in tissues).
Organ failure.
Pneumonia.
Seriously low blood pressure (hypotension) may lead to shock.
Severe infection that may lead to amputation or sepsis.
True or false: Rocks have different properties such as hardness and texture
True. Rocks have different properties.
What are Rocks?Rocks are naturally formed, consolidated material composed of grains of one or more minerals. Rocks are grouped into three categories depending on their origin:
igneous (formed from solidification of molten material)sedimentary (formed by the accumulation of fragmental material derived from preexisting rocks of any origin as well as the accumulation of organic material or precipitated material)metamorphic (occur as a result of high pressure, high temperature and the chemical activity of fluids changing the texture and (or) mineralogy of preexisting rocks).Physical properties of RocksThere are many physical properties of rocks, they may include; color, crystal form (or shape), hardness, luster (or shine), density, texture and fracture (how the rock disintegrates)
In conclusion, all rocks have different physical properties; texture and hardness are few of the possible properties.
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A particle moving uniformly along a curved path has a period of 0.24 s and a speed of 4.2 m/s. The radius of the path is?
a. 16 cm
b. 2.6 cm
c. 1.0 m
d. 0.062 cm
We obtain the radius of the curved path through which the ball travels as 16 cm. Option A
What is the radius of the path?We know that we can be able to obtain the radius of the path from the period of the path and the velocity of the object by the use of the equation;
V = 2πr/T
Given that;
V = velocity
T = period
r = radius
VT = 2πr
r = VT/2π
r = 4.2 m/s * 0.24 s/ 2 * 3.142
r = 1.008/6.284
r = 0.16 m or 16 cm
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A person with a weight of 190 N sits on a box with a weight of 20 N, what is the normal force on the box?
The normal force on the box is 210 N.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Normal force on the box = total Weight of box and person = 210 N.
The normal force on the box is 210 N.
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An object with a mass of 7 kg accelerates 8 m/s2 when an unknown force is applied to it. What is the amount of the force?
The amount of force applied to the 7kg object that caused it to accelerate at 8m/s² is 56 newtons.
What is the force applied to the object?A force is simply a push or a pull of an object resulting from the object's interaction with another object.
From newton's second law;
Force = mass × acceleration
Given the data in the question;
Mass of the object = 7kgAcceleration = 8m/s²Applied force = ?Plug the given values into the formula to determine the applied force.
Force = mass × acceleration
Force = 7kg × 8m/s²
Force = 56kgm/s²
Force = 56 N
Therefore, the applied force is 56 newtons.
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How many kWh of energy would be needed for brushing your teeth with an electric
toothbrush daily for the month of May?
There are models that work with batteries and others with batteries that can be charged in the electrical network. Let's look at an average brush, with a power of 3 W. If you brush your teeth 3 times a day for 5 minutes, you have a daily consumption of 0.00075 kWh. In one month, consumption would amount to 0.225 kWh.
si un avión tarda 2 segundos en recorrer 160 metros ¿cuál es su velocidad en km/h?
Answer:
la velocidad del avion es de 304 km/h
Explanation:
Según la pregunta,
La distancia recorrida por un avión en 2 segundos es de 160 metros.
Entonces, para encontrar la velocidad, debemos dividir la distancia recorrida por el tiempo que se tarda en recorrer esa distancia.
[tex] \rm \implies Velocidad = \dfrac{distancia}{tiempo \: empleado} \\ \\ \rm \implies Velocidad = \frac{160}{2} \\ \\ \rm \implies Velocidad = 80 \: m {s}^{ - 1} [/tex]
Para convertir m/s a km/h, el numerador debe dividirse por 1000 y el denominador debe dividirse por 3600. Esto implica que la cantidad total que se da en m/s debe multiplicarse por 3600/1000.
Al convertirlo en forma mínima, la cantidad dada en m/s debe multiplicarse por 18/5 para convertirla en km/h.
[tex] \therefore [/tex]
[tex] \rm \implies Velocidad = 80 \times \dfrac{18}{5} \: km {h}^{ - 1} \\ \\ \rm \implies Velocidad = 16 \times 19 \: km {h}^{ - 1}\\ \\ \rm \implies Velocidad = 304 \: km {h}^{ - 1}[/tex]
The name iron (ll) chloride would indicate that the compound contains
The compound would contain;
iron ions with an 11+ chargetwo ions of chlorine. Options A and C.What is an ionic compound?We have to know that an ionic compound has to d with a compound that is composed of ions. The ions are species that do not have the same number of positive and negative charges.
We have to note that ionic compounds must be composed of two ions that have opposite charges. In this case the iron II ion has a positive charge while the chloride ion has a negative charge.
The chloride ions are two and there is only one iron II ion present.
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Missing parts;
The name iron (II) chloride would indicate that the compound contains
a. iron ions with an 11+ charge
b. iron ions with a negative charge
c. two ions of chlorine
d. none of the above
A student notices that he does better on tests if he sleeps for at least 8 hours. He decides that for the next 3 tests he has in science class, he will sleep different amounts of times and see how he does on his tests. For his next science test, he sleeps only 4 hours the night before, 6 hours before the next test, and 8 hours before the final exam. The chart shows his data. grade Test 1 2 3 Hours of Sleep 4 6 8 Grade 56 75 80 What is the dependent variable?
The dependent variable in the experiment in which a student sleeps different intervals of time to get different grades is the grade
In this experiment,
Independent variable = Hours of sleepDependent variable = GradesControl variable = The studentAn independent variable is the variable that can be altered by the researcher to get different results. The dependent variable is the variable that gets altered due to the change in independent variable.
Therefore, the dependent variable is the Grades
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How much force in Newtons is required to accelerate a 5 kg bowling ball at 2 m/s²?
O 3 N
O 7 N
O 10 N
O 2.5 N⁰
A 1-column table. The first column labeled properties of mixtures has entries has no set composition, must have more than one state of matter, must have more than one substance.
What mistake did Dominic make?
The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed.
There is a definite recipe to make each mixture, so the composition of a mixture is set.
Although it is possible to have more than one state, it is also possible to have only one state.
A single substance can be used to make a mixture if the substance is composed of more than one element.
The mistake that Dominic made in the above prompt is: "Although it is possible to have more than one state in mixtures, it is also possible to have only one state." (Option C).
What is a mixture?A mixture is a material composed of two or more separate chemical components that are not chemically linked. A mixture is the physical combination of two or more substances that retain their identities and are blended in the form of solutions, suspensions, and colloids.
Mixtures are classified into two types: heterogeneous and homogeneous. Heterogeneous mixes feature distinct components, whereas homogeneous mixtures look uniform throughout. A solution, which can be solid, liquid, or gas, is the most frequent form of homogeneous combination.
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Describe the particles when water is a liquid. What is their distance from one another? How quickly do they move? What did equations look like?
Particles in liquids are dispersed randomly and are relatively near to one another. The particles, collisions between them happen more frequently than in gases even if particles are moving quickly in all directions.
What is meant by particle ?A particle, also known as a corpuscule in older texts, is a tiny, confined object to which one or more physical or chemical attributes, such as size, density, or mass, can be applied.
How many particles are there in physics?There are 61 subatomic particles in the Standard Model as it is currently constructed. Since the mid-1950s, hundreds of more kinds of particles have been found. These subatomic particles can mix to produce composite particles.
What are particles made of?The Standard Model of Subatomic Particles is now thought to be the best theory to explain the universe's most basic constituents. It discusses how the building blocks of all known matter are quark, which make up neutrons and protons and leptons, which contain electrons.
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