Answer: The temperature change occurs from heat transfer if the ice melts and becomes liquid water. Similarly, energy is needed to vaporize a liquid, because the molecules in a liquid interact with each other via attractive forces.
Explanation:
How would you rate your mental health from a scale of 1 (lowest) to 5 (highest) and why?
if you divide velocity by time what unit do you get
Answer:
m/s^2, acceleration
Explanation:
velocity in SI units is meter / second
dividing by time(second) gives meter / second^2 which is acceleration.
intensity of light in SI system
Answer: candela
Explanation:
The SI unit for the measurement of intensity is referred to as the candela. The candela is simply used in the measurement of the visual intensity with regards to light sources such as the bulb we have in torches or the light bulbs that we have in our various homes. It is the power that a light source emits in a certain direction.
A lever of length 1m has been used to lift a load of 600N by applying an effort of 200N. If load is at 20cm from fulcrum, calculate mechanical advantages, velocity ratio and efficiency
solve numerical problem
Answer:
1) The Mechanical Advantage of the lever is 3
2) The velocity ratio of the lever is 4
3) The efficiency of the lever is 75%
Explanation:
A lever is a simple machine that is used to lift a heavy load with a little effort or force
The mechanical advantage is the ratio of the force output to the force input
The given parameters of the lever are;
The length of the lever = 1 m
The weight of the load (force output), [tex]F_r[/tex] = 600 N
The effort applied (force input), [tex]F_e[/tex] = 200 N
1) The Mechanical Advantage, MA of the lever is given as follows;
[tex]MA = \dfrac{F_r}{F_e} = \dfrac{600 \ N}{200 \ N} = 3[/tex]
The Mechanical Advantage, MA of the lever = 3
2) The velocity ratio, V.R., is the ratio of the distance moved by the effort, [tex]L_e[/tex], to the distance moved by the load, [tex]L_r[/tex]
For the lever, we have;
The distance of the load from the fulcrum, [tex]L_r[/tex] = 20 cm = 0.2 m
Therefore, we have;
The distance of the effort from the fulcrum, [tex]L_e[/tex] = 1 m - 0.2 m = 0.8 m
From which we have;
[tex]V.R.= \dfrac{L_e}{L_r} = \dfrac{0.8 \ m}{0.2 \ m} = 4[/tex]
The velocity ratio of the lever = 4
3) The efficiency, η, is given as follow;
[tex]\%Efficiency, \, \eta = \dfrac{M.A.}{V.R.} \times 100 = \dfrac{3}{4} \times 100 = 75\%[/tex]
The efficiency of the lever is 0.75 or 75%.
Explanation:
The length of the lever = 1 m
The weight of the load (force output), F_rF
r
= 600 N
The effort applied (force input), F_eF
e
= 200 N
1) The Mechanical Advantage, MA of the lever is given as follows;
MA = \dfrac{F_r}{F_e} = \dfrac{600 \ N}{200 \ N} = 3MA=
F
e
F
r
The length of the lever = 1 m
The weight of the load (force output), F_rF
r
= 600 N
The effort applied (force input), F_eF
e
= 200 N
1) The Mechanical Advantage, MA of the lever is given as follows;
MA = \dfrac{F_r}{F_e} = \dfra
=
200 N
600 N
=3
The Mechanical Advantage, MA of the lever = 3
2) The velocity ratio, V.R., is the ratio of the distance moved by the effort, L_eL
e
, to the distance moved by the load, L_rL
r
For the lever, we have;
The distance of the load from the fulcrum, L_rL
r
= 20 cm = 0.2 m
Therefore, we have;
The distance of the effort from the fulcrum, L_eL
e
= 1 m - 0.2 m = 0.8 m
From which we have;
V.R.= \dfrac{L_e}{L_r} = \dfra
The distance of the load from the fulcrum, L_rL
r
= 20 cm = 0.2 m
Therefore, we have;
The distance of the effort from t
V.R.= \dfrac{L_e}{L_r} = \dfrac{0.8
L
e
=
0.2 m
0.8 m
=4
The velocity ratio of the lever = 4
3) The efficiency, η, is given as follow;
\%Efficiency, \, \eta = \dfrac{M.A.}{V.R.} \times 100 = \dfrac{3}{4} \times 100 = 75\%%Efficiency,η=
V.R.
M.A.
×100=
4
3
×100=75%
The efficiency of the lever is 0.75 or 75
An object of mass 8 kg Is attached to a massless string of length 2 m And Suong With a tangentialVelocity of 3 m/s what isThe tension in the string
Answer:
36 N
Explanation:
The tension on the string :
T =mv²/r ------where
m= mass of object = 8 kg
v= tangential velocity = 3 m/s
r= length of the string = 2m
T= [ 8 * 3² ] / 2
T= 36 N
HELP PLSSS
A 13.3 kg box sliding across the ground
decelerates at 2.42 m/s2. What is the
coefficient of kinetic friction?
(No unit)
ps( its not 0.242)
Given :
A 13.3 kg box sliding across the ground decelerates at 2.42 m/s².
To Find :
The coefficient of kinetic friction.
Solution :
Frictional force applied to the box is :
[tex]f = ma[/tex] ....1)
Also, force of friction is given by :
[tex]f = \mu mg[/tex] ....2)
Equating equation 1) and 2), we get :
[tex]\mu mg = ma\\\\\mu = \dfrac{a}{g}\\\\\mu = \dfrac{2.42}{9.8}\\\\\mu = 0.247[/tex]
Therefore, the coefficient of kinetic friction is 0.247 .
Which term represents the change of a substance from the solid phase to the liquid phase?
Answer:
it is called melting or phase transition :)
Explanation:
Match the information below with the type of energy it can be used to calculate.
Words to fill the blanks:
1.
Potential Energy
2.
Kinetic Energy
3.
Both Potential and Kinetic Energy
Answer:
Explanation:
Mass - 3
Height - 1
Gravity - 1
Velocity - 2
Potential Energy: mgh
Kinetic Energy: 1/2mv^2
Dentist description
Need 100 IQ and more
A food package is dropped from a helicopter flying horizontally at a height of 125m. If the magnitude of the velocity of the packageafter 2seconds is 25m/s. Find
a. The speed of the helicopter at the moment the package is dropped.
b. The position of the package after 2s.
c. The time of flight of the food package
d. The horizontal distance covered.
Answer:
a. The speed of the helicopter at the moment the package is dropped is approximately 15.519 m/s
b. The position of the package 2s after it is dropped is (31.038 m, -9.8 m)
c. The time of flight of the food package is approximately 5.105 seconds
d. The horizontal distance covered is approximately 79.22 m
Explanation:
The given parameters are;
The height at which the helicopter is flying = 125 m
The magnitude of the velocity of the package after 2 seconds, v = 25 m/s
a. The vertical velocity of the package, [tex]v_y[/tex], is given as follows;
[tex]v_y[/tex] = [tex]u_y[/tex] + g·t
Where;
[tex]u_y[/tex] = 0 m/s for the dropped food package
t = The duration of the package in the air = 2 s
g = The acceleration due to gravity = 9.8 m/s²
Therefore;
[tex]v_y[/tex] = g·t = 9.8 m/s² × 2 s = 19.6 m/s
We have, [tex]v = \sqrt{v_x^2 + v_y^2}[/tex],
Where;
vₓ = The horizontal velocity of the food package = The horizontal speed of the helicopter
therefore, [tex]v_x = \sqrt{v^2 - v_y^2}[/tex], which gives;
[tex]v_x = \sqrt{v^2 - v_y^2} = \sqrt{25^2 - 19.6^2} \approx 15.519 \ m/s[/tex]
The speed of the helicopter at the moment the package is dropped ≈ 15.519 m/s
b. The vertical if the package after 2 s is given as follows;
The vertical position of the package after 2 s is given by the kinematic equation, h = 1/2·g·t² = 1/2 × 9.8 m/s² × 2 s = 9.8 m
The food package is located 9.8 m vertically below the point where it is dropped
The horizontal position, x, of the package after 2 s is given by the following kinematic equation, x = vₓ × t
Therefore, x = 15.519 m/s × 2 s ≈ 31.038 m
The coordinates of the location of the package 2 seconds after it is dropped is (31.038 m, 9.8 m)
c. The time of flight, [tex]t_{tot}[/tex], of the food package which is the time it takes the package to reach the ground from 125 m, is given as follows;
[tex]t_{tot} = \sqrt{\dfrac{2 \cdot h}{g} } = \sqrt{\dfrac{2 \times 125 \ m}{9.8 \ m/s^2} } \approx 5.051 \ seconds[/tex]
The time of flight of the food package, [tex]t_{125}[/tex] ≈ 5.105 seconds
d. The horizontal distance covered, [tex]x_{tot}[/tex] = vₓ × [tex]t_{tot}[/tex] ≈ 15.519 m/s × 5.105 s = 79.224495 m ≈ 79.22 m.
Type the correct answer in the box. Round your answer to the nearest whole number.
What’s the percentage of organisms that survived?
A natural disaster caused a population of 4,695 organisms to migrate to a new habitat. A few generations after the disaster, it was observed that the new habitat did not support the survival of the species. The table shows the population of the species in the two habitats.
Original Habitat New Habitat
4,695 2,326
Based on the table, the population in the new habitat is about percent of the original population.
Answer:
50%
Explanation:
2326/4696 = 0.495
Can be rounded to: 0.50
50%
Answer:
50
Explanation:
just took the test :)
6th grade science!!!!!!!!!
As the altitude decreases,air pressure increases. The statement is true. Option A is correct.
What is pressure?The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.
It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.
As the altitude decreases,air pressure increases. The statement is true.
Hence, option A is correct, and the given statement is true.
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Sonny Toomey 16 seconds to finish a 100-m race. What was Sonny's average speed in the race? Give your answer in the decimal form.
Answer:
6.25 m/s.
Explanation:
Total distance travelled = 100 m
Total time = 16 s
Average speed =?
Average speed is simply defined as the ratio of total distance travelled to the total time taken to cover the distance. Mathematically, it is expressed as:
Average speed = total distance / total time
With the above formula, we can obtain the average speed of Sonny Toomey as illustrated below:
Total distance travelled = 100 m
Total time = 16 s
Average speed =?
Average speed = total distance / total time
Average speed = 100 / 16
Average speed = 6.25 m/s
Therefore, the average speed of Sonny Toomey is 6.25 m/s
Describe how radio waves are different from sound waves
Answer:radio waves are electromagnetic waves propagating in any non-conductive media by varying the field at each point in it. Sound is a wave of pressure changes of the medium such as air. Radio waves are a combination of electric and magnetic fields that need no medium to travel upon.
Explanation:please give brainliest
Radio waves are longest electromagnetic waves whereas sound waves are mechanical waves. Sound waves can move only through a medium and electromagnetic waves does not need a medium to travel.
What is radio waves ?Radio waves are a kind of electromagnetic waves. In the electromagnetic spectrum, radio waves has the longest wavelength and smallest frequency. Thus, radio waves have lower energy in comparison to other electromagnetic waves.
Sound waves are mechanical waves. Mechanical waves needs a medium to travel where as electromagnetic waves does not need a medium and they can moves through vacuum.
Sound waves are longitudinal mechanical waves where, the oscillation of particles is in the direction along the wave propagation. Electromagnetic waves are more energetic and faster than sound waves.
To find more on sound waves, refer here:
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Fill in the blank..
The moon takes _______ to revolve around the Earth.
ANSWER CHOICES:
A. 27 days
B. About a month
Answer:
The moon takes 27 days to revolve around the earth.
Explanation:
I hope this helps :)
The moon takes 27 days to revolve around the Earth.
If you want a charged object to become neutral,then you have to ————-? A.Touch it with a positively charged object B.Touch it with neutral objects C.Touch it with a negativity charged object D.Touch it with the ground
Answer: D.Touch it with the ground
Explanation:
The charged object can become neutral if touched with the ground in a process known as grounding.
If the charged object is negatively charged, excess electrons will flow into the ground thus making the object neutral. If the object is positively charged, electrons will flow from the ground into the object and neutralise it.
Pictures below :)
Have a nice day!!
Answer:
17N right
Explanation:
Laney et al. (false memory):(a) Outline the rating scale used in the Food History Inventory [2 marks]
Answer: The rating scale that is used in food history inventory is from 1 to 8.
Explanation:
In this case the participants have to rate 24 items on a scale of 1 to 8.There are variety of questions related to food or fooding habits.
The questions like do you go out for food?
Do you like bread ? if yes how will you rate it on a scale of 1 to 8.
The questions like this has to be answered in a way . It is done in order to see the preferences and false memory regarding the food preference that people have.
Help me with this homework please
Answer:
100 N
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 5 kg
Acceleration (a) = 20 m/s
Force (F) =?
Force is simply defined as the product of mass and acceleration. Mathematically, it can be expressed as:
Force (F) = mass (m) × acceleration (a)
F = ma
With the above formula, we can obtain the force need to move the object. This can be obtained as follow:
Mass (m) = 5 kg
Acceleration (a) = 20 m/s
Force (F) =?
F = ma
F = 5 × 20
F = 100 N
Therefore, a force of 100 N is needed to move the object.
Some sharks can swim at average cruising speeds of three miles per hour. If a shark swam at that average speed for seven hours, how far would it have traveled?
Answer:
21 miles
Explanation:
3 miles an hour for 7 hours
Its simply 7m*3m/hr=21 miles
What scientific concept is
being illustrated in this
model?
Answer:
the scientific concept being illustrated in this model is dispersion
which of the following can carry light waves but not sound waves
HELP ME PLSSLSLSPSPS im stuck pls help
A 13.3 kg box sliding across the ground
decelerates at 2.42 m/s2. What is the
coefficient of kinetic friction?
(No unit)
How many atoms are in 3.5mol?
Answer:
A mole of any chemical is 6.02 x 1023 units of that chemical. So, 3.5 moles of carbon means 6.02 x 1023 x 3.5 atoms of Carbon.
Explanation:
How is an ammeter connected in a circuit?
a. Next to the cell
b. Between 2 loads
c. In series with a load
d. Parallel to a load
An ammeter is connected series in a circuit. An ammeter is used to detect how much current is flowing through the circuit, so the Resistance of ammeter is very low by connecting it parallel to a circuit this may cause short circuit and burn the ammeter or the circuit.
which correctly describes how the energy of a wave on the electromagnetic spectrum depends on wavelength and frequency?
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"electromagnetic spectrum depends on wavelength and frequency"
When electromagnetic radiation interacts with single atoms and molecule,its behavior also depends on the amount of energy per quantum(photon)it carries wave number =1/wavelength in cm speed of light=wavelength x frequency energy = Planck's constant x frequency.
Electromagnetic radiation interacts with matter in different parts of the spectrum.
Electromagnetic radiation interacts with matter in different ways in different parts of the spectrum.The types of interaction can be so different that it seems justified to refer to different types of radiation.There is a continuum containing all these different kind of electromagnetic radiation.Thus we refer to spectrum but divide it up based on the different interaction with matter.
Answer:
Energy increases with decreasing wavelength and increasing frequency.
Explanation:
6. A 50 N block is raised 2 m. If the net work done on the block is 50 J, what is the applied force on the block?
The force applied in raising the block to the given height is 25 N.
The given parameters:
weight of the block, Fn = 50 Nheight the block was raised, h = 2 mwork done on the block, W = 50 JThe force applied in raising the block to the given height is calculated as follows;
[tex]Work \ done= \ F \times d\\\\W = Fd\\\\F = \frac{W}{d} \\\\F = \frac{50 \ J}{2 \ m} \\\\F = 25 \ N[/tex]
Thus, the force applied in raising the block to the given height is 25 N.
Learn more about work done here: https://brainly.com/question/19498865
What term best describes the driving force behind the movement of the plate tectonics? A Expansion B Convergence C Convection D Transformation
Answer:
convection in the mantle.
A helicopter is moving past some clouds at a velocity of 5 km/hr north relative to the clouds. The clouds are moving past the ground at a velocity of 3.5 km/hr north. How fast is the helicopter going past the ground?
Answer:
8.5 km/hr
Explanation:
The helicopter is going past the ground at a velocity 8.5 km/hr in north direction relative to ground.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Given that:
Velocity of a helicopter with respect to the clouds is: v= 5 km/hr in north direction.
Velocity of the clouds with respect to the ground: u= 3.5 km/hr in north direction.
So, Velocity of a helicopter with respect to the ground: V = v + u
= ( 5 +3.5) km/hr in north direction.
= 8.5 km/hr in north direction.
Hence, the helicopter is going past the ground at a velocity 8.5 km/hr in north direction relative to ground.
Learn more about velocity here:
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The graph above shows the position and time calculate the velocity of the particle from T=0s to T=4s?
0.75m/s
0.5m/s
2m/s
1.33m/sm/s
Answer:
The velocity of the particle from T = 0 s to T = 4 s is;
0.5 m/s
Explanation:
The given parameters from the graph are;
The initial displacement (covered) at time, t₁ = 0 s is x₁ = 1 m
The displacement covered at time, t₂ = 4 s is x₂ = 3 m
The graph of distance to time, from time t = 0 to time t = 4 is a straight line graph, with the velocity given by the rate of change of the displacement to the time which is dx/dt which is also the slope of the graph given as follows;
[tex]The \ slope \ of \ the \ displacement \ time \ graph, \ m =velocity, \ v= \dfrac{x_2 - x_1}{t_2 - t_1}[/tex]
[tex]Therefore, \ the \ velocity \ of \ the \ particle \ v = \dfrac{3 \ m - 1 \ m}{4 \ s - 0 \ s} = \dfrac{2 \ m}{4 \ s} = \dfrac{1}{2} \ m/s[/tex]
The velocity of the particle from t = 0 s to t = 4 s = 1/2 m/s = 0.5 m/s.