Answer: Change 2 would make the lever more efficient because this would make it easier to lift.
Explanation:
The considered change is: Make a longer lever that will require less force because it would make the lever more efficient because this would make it easier to lift.
What is lever?A beam is pivoted at a fixed fulcrum, to form a simple machine known as a lever. A body that can rotate about a point on itself is called a lever.
The lever is classified into three types based on where the fulcrum, weight, and effort are located. Additionally, leverage is a systemic mechanical advantage.
One of the six simple devices that Renaissance scientists identified. Leverage is the ability to increase an input force into a bigger output force through the use of a lever. The mechanical advantage of the lever is determined by the ratio of output force to input force.
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. The net force F acting on an object that moves along a straight line is given as a function of time t by 2 F t( ) = κt + τ , where 2 κ = 1 N s and τ = 1 N . What is the change in momentum of the object from t = 0 s to t = 3 s?
The change in the momentum of the object moving along a straight line is determined as 3 Ns.
Change in momentum of the object
The change in the momentum of the object is equal to impulse received by the object.
The impulse received by the object is determined from the product of force and time of action.
J = Ft
Ft() = kt + τ
at time 0 s
Ft(0) = 1(0) + 1
Ft(0) = 1 Ns
at time , t = 3 s
Ft(3) = 1(3) + 1
Ft(3) = 4 Ns
Change in momentum from 0 s to 3 s, = 4 Ns - 1 s = 3 Ns
Thus, the change in the momentum of the object moving along a straight line is determined as 3 Ns.
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A glass slides across a bar and slows down due to a kinetic friction of 0. 175N. If the glass weighs 0. 500N, what is the coefficient of kinetic friction between the glass and the bar?
Answer:
F = M a = Ff force of friction
Ff = μ M g = μ W where M g = weight of glass
The problem gives the kinetic friction as a force (Ff) in Newtons
μ = Ff / W = .175 / .500 = .35
A piece of machinery with a moment of inertia of 2.5 kg-m? rotates with a constant angular speed of 4.0
rad/s. A bolt loosens, causing a part of it to shift outward from the rotation axis, increasing the moment
of inertia by 1.0 kg-m². What would the new angular speed of the machinery be? (hint: Conservation
of momentum) 10 rad/s
For a piece of machinery with a moment of inertia of 2.5 kg-m, new angular speed is mathematically given as
wf= 2.857 rad/s
What would the new angular speed of the machinery be?Generally, the equation for the final angular speed is mathematically given as
wf = wi*(I1/I2)
Therefore
wf = 4.0*(2.5/3.5)
wf= 2.857 rad/s
In conclusion, the new angular speed
wf= 2.857 rad/s
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The spacecraft that really gave scientists their first good close-up look at the planet Mercury was:
Answer:
Mariner 10 in 1974 and 1975
Explanation:
how is sound produced
Sounds are created when something vibrates (shakes back and forth), sending waves of vibrations into the ears of the listener. When a bell is struck, the metal vibrates. The vibrations travel through the air as sound waves.
hope this helps
Explain why ethylated spirit at room temperature when dropped at the back of the Palm makes the Palm to feel very cold.
Answer:
methylated spirit is in fact methanol added to ethanol (usually 10% methanol is used). The liquid evaporates which means that the liquid converts to a gaseous state. This process requires energy which it extracts from your body in the form of heat.
Explanation:
How does a person’s nutritional needs change with an increase in activity to gain muscle mass?
Answer:
Dietary carbohydrates provide the body with energy for tough workouts and replenish energy stores in muscles in the form of glycogen.
Explanation:
A spring whose stiffness is 980 N/m has a relaxed length of 0. 50 m. If the length of the spring changes from 0. 25 m to 0. 81 m, what is the change in the potential energy of the spring
151.9j
Explanation:
PE=1/2kx^2
PE=1/2(980)(.50)= 245j
PE=(1/2)(980)(.81)= 396.9j
396.9- 245= 151.9j
describe why the bottom of a pot is painted black and the interior is painted silver
Explanation:
The bottom part of the cooking utensil or pan is painted black. The reason is that the black surface absorbs more heat and so the contents of utensil or pan get cooked rapidly if its bottom part is painted black.
Hence, by having black bottom and shiny inner surface we can utilise the maximum heat given to the utensil.
Once the merry-go-round travels at this new angular speed, with what force does the person need to hold on?.
For a merry go round with a radius of R=1.8 m and moment of inertia I=184 kg-m^2 is spinning with an initial angular speed of w=1.48 rad/s is mathematically given as
F= 618.9 N
What is the centripetal force?Generally, the equation for the angular speed is mathematically given as
w = v/R
Therefore
w= 4.7/1.8
w= 2.611 rad/s
Where total momentum
Tm= 642.96 + 272.32
Tm= 915.28
and total inertia
Ti= 184 + 246.24
Ti= 430.24
In conclusion, centripetal force
F= mrw^2
F = m*R*w2^2
F = 76*1.8*2.127^2
F= 618.9 N
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a merry go round with a radius of R=1.8 m and moment of inertia I=184 kg-m^2 is spinning with an initial angular speed of w=1.48 rad/s in the counter clockwise direction when viewed from above a person with mass m=76 kg and velocity v=4.7 m/s runs on a path tangent to the merry go round once at the merry go round the person jumps on and holds on to the rim of the merry go round angular speed of the merry go round after the person jumps on 2.127 rad/s Once the merry go round travels at this new angular speed with what force does the person need to hold on?
Car A can travel around a curved section of road without skidding at a maximum constant speed of 10 m/s. When car B travels around the same curve without skidding at its maximum speed, it has twice the centripetal acceleration as car A. The maximum speed at which car B can safely travel around the curve is most nearly
Answer:
C) 14 m/s
Explanation:
First step is to work out the centripetal acceleration of Car A. The equation for centripetal acceleration is:
a = v^2 / r
So we substitue in the value given for Car A's speed and get:
a = (10)^2 / r
a = 100 / r
We know that Car B has twice the centripetal acceleration of Car A, or 2a, therefore:
2a = 2 ( 100 / r ) = 200 / r
Now we know the centripetal acceleration of Car B! Last step: we use a = v^2 / r to find the velocity of Car B:
a = v^2 / r
200 / r = v^2 / r (r's cancel)
v^2 = 200
v = 14.1 m/s
Hope that helped! Sorry, I have no idea how to use the equation tool.
A pan of water is heated from 23°C to 78°C. What is the change in its temperature on the Kelvin and Fahrenheit scales?
The change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.
Temperature ScaleTemperature scale is simply the methodology of calibrating the physical quantity of temperature.
There are 3 main temperature scales, namely; Celsius, Fahrenheit, and Kelvin.
The expression for conversion are;
Celecius to Kelvin : 0°C + 273.15 = 273.15KCelecius to Fahrenheit : (0°C × 9/5) + 32 = 32°FGiven the data in the question;
Initial temperature of pan I = 23°CFinal temperature of pan F = 78°CFirst we determine the change in temperature.
ΔT = Final temperature - Initial temperature
ΔT = 78°C - 23°C
ΔT = 55°C
The change in temperature on the Kelvin scale
ΔT = 55°C = 55°C + 273.15 = 328.15K
The change in temperature on the Fahrenheit scale
ΔT = 55°C = (55°C × 9/5) + 32 = 131°F
Therefore, the change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.
the change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.
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What is the position of the earth, moon, and sun during a new moon?
Earth is between the sun and the moon
sun is between Earth and the moon
moon is to the side of Earth and the sun
moon is between the sun and Earth
Answer: The first option
Explanation: common sense
The Moon always rotates about the Earth in its orbit. The position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.
What is new moon?When moon has travelled for 14 days, it starts its journey again for the next 14 days. The journey starts from the new moon to the full moon. The position of new and full moon is the same. At this time, the Earth is in between the Sun and the Moon.
Thus, the position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.
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True or false Light refracts because the medium pulls on light particles, causing them to
speed up.
False or false Light refracts when it passes from one medium to a new medium at an angle.
Answer:
False
Explanation:
Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density).
what is the acceleration due to gravity on a planet with a mass 10 times that of earth, and a diameter 4 times that of earth
Answer:
gravity is changed by a factor of 10/16
Explanation:
gravitational force = m1 m2 G / r^2 now change the m1 and r
= 10 m1 m2 G/ (4 r)^2
= 10 /16 m1 m2 G / r^2
10 /16 the earth's gravity
5 (d) Assume that the power available to raise packages is constant. A package of mass greater than 36 kg is raised through the same height. Suggest and explain the effect of this increase in mass on the operation of the conveyer belt.
Answer:
Here is the answer for the question
Mass is increased and power is constant, so increase in potential energy of mass is also greater.
What is Potential energy?The labor required to move an object into a position is equated with the potential energy. For instance, if you were to pick up a book and set it down on a table.
Elastic When materials stretch or contract, elastic potential energy is stored. Spring, rubber band, and slingshot motions are a few examples of elastic potential energy.
Electric - The ability to perform labor depending on an object's electric charge is known as electric potential energy. Nuclear: The atom's internal particle potential energy. Chemical potential energy is the energy held in chemicals.
Therefore, Mass is increased and power is constant, so increase in potential energy of mass is also greater.
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why metallic chain is used in the tanker transporting highly inflammable liquid
Answer:
For the displacement of charge
Explanation:
When the vehicle is in motion,due to friction in air,the body of the vehicle gets charged. if accumulated, charge becomes excessive,sparking May occur and inflammable materials may catch fire. therefore metallic chains touching the ground are introduced so that the charge quickly leaks to the earth.
What is the difference between heat capacity and specific heat?.
Answer:
Heat capacity is the amount of heat required to raise the temperature of an object by 1oC. The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1oC.
Explanation:
The answer is above.
There are pros and cons to both e-readers and paper books. Do you think the pros outweigh the cons more for modern electronic readers, or for good old-fashioned paper books? Maybe if simply comes down to personal preferences as opposed to rational decision-making. Which do you prefer? Which do you think is better? Explain.
Answer:
books are better
Explanation:
Personaly, I think books are better as you can pass them on for a long time and paper lasts longer thank a phpne or a tablet. Books also reduce E-waste as paper can be recycled and tablet and phone batteries die where as the only way a book can die is if it has been distroyed
In a parallel circuit the ________ resistance is always less than the resistance of any individual resistor.
Answer:
"total" resistance
The current will have the option of going thru more than 1 resistor so the total resistance of the circuit will be less than any resistance in the circuit.
A cosmic ray electron moves at 7.50 × 106 m/s perpendicular to the Earth’s
magnetic field at an altitude where field strength is 1.00 × 10−5 T. What is the radius
of the circular path the electron follows?
Answer:
4.27m
Explanation:
force on moving charge= qvBsin$
centripetal force=mv^2/r
since the forces are equal
mv^2/r=qvBsin$
r= (mv^2)/(qvBsin$) = mv/qBsin$
r-radius
m-mass of an electron
q-charge on electron
v-velocity of the electron
B-field strength
$ - angle
r= ((9.1093837 ×10^-31)kg × 7.50 × 10^6 m/s)/(1.6×10^-19C×10^-5T×sin90) = 4.27m
The plasma membrane of a neuron has voltage-gated sodium and potassium channels. What is the effect of membrane depolarization on these channels?.
Answer:
Depolarization causes the Voltage-gated channels to open in order for ions to flow or rush in
Radiation transfers
thermal
energy by
waves. These waves transfer energy from a warmer object to a cooler object, with or without
Answer:
Radiation travels by Waves!!
Explanation:
BONUS:Thermal radiation is a longitudinal wave.
Hope this helped
Answer:
Radiation transfers energy by ⇒ electromagnetic waves. These waves transfer energy from a warmer object to a cooler object, with or without ⇒ matter .
Explanation:
edge2022
The average 8- to 18-year-old spends __________ per day on average in front of a screen doing very little to no physical activity. A. 0 hours B. 30 minutes C. 1 hour D. 3 hours or more Please select the best answer from the choices provided. A B C D
Answer:
D. 3 hours or more
Explanation:
The average 8- to 18-year-old spends at least D. 3 hours every day in front of a screen, performing little to no physical activity. This is because, instead of exercising and socializing with their peers, children and teenagers frequently talk, watch a lot of movies/shows, or play video games on their computers. Unfortunately, this is typically considerably more than three hours every day. Although some children still prefer physical activities over this, the bulk of the population does not.
how would you ground an electrical applicance
A bicycle tire has a radius of .4m and a mass of 2.2Kg. What is the moment of inertia for the bicycle tire?
Answer:
0,352kg*m²
Explanation:
I=m*R²
i=2,2kg*0,4m*0,4m=0,352kg*m²
Light enters air from water. The angle of refraction will be.
Answer:
90 degrees...
Explanation:
Hope this helps you!!!
A boat is pulling a water skier along. There is a force on the water produced by the engine propeller. This force causes the boat to move.
Answer: this was the answer you were looking for -
Explanation
How does a machine, such as a ramp, help make work easier?
A machine can help decrease the input force and the output force.
A machine can help increase the input force and the output force.
A machine can help increase the input force and decrease the output force.
A machine can help decrease the input force and increase the output force.
Answer:
D
A machine can help decrease the input force and increase the output force.
Answer:
it'sD:)
Explanation:
when an atom is unstable it will ___ into a new atom
Answer:
When an atom is unstable it will change into a new atom