The illustration in figure below shows a uniform metre rule weighing 30 N pivoted on a wedge placed under the 40 cm mark and carrying a weight of 70 N hanging 2 from the 10 cm mark. The ruler is balanced horizontally by a weight W hanging from the 100 cm mark. Calculate the value of the weight W.
Answer:
W = 30 N
Explanation:
Applying the summation of torques about the wedge for equilibrium, taking the clockwise direction as negative. Since the ruler is balanced horizontally about the wedge. Therefore, the summation of all torques acting about the wedge must be equal to zero.
[tex](70\ N)(40\ cm - 10\ cm)-(30\ N)(50\ cm-40\ cm)-(W)(100\ cm - 40\ cm) = 0\\W(60\ cm) = (70\ N)(30\ cm)-(30\ N)(10\ cm)\\\\W = \frac{1800\ N.cm}{60\ cm}[/tex]
W = 30 N
why will a plant die if it doesn't receive sunlight?
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light.
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light
Explanation:
i got this from
https://sciencing.com/what-happens-to-plants-if-they-have-no-sun-12486997.html#:~:text=Sunlight%20allows%20plants%20to%20perform,for%20plant%20growth%20and%20health.&text=Plants%20that%20are%20denied%20sufficient,that%20usual%2C%20searching%20for%20light.
A 2400W electric toaster is connected to a standard 120 V wall outlet. A family
measured their monthly toaster usage to be 6.5 hrs.
6
1) How much electrical energy (in kilowatt hours - kWh) did the toaster dissipate
during the measured month? (round to 1 decimal place & do not include units)
2) If the local power company charges $0.13/kWh, then calculate (in $) the monthly
total cost of this toaster. (round to 2 decimals & do not include units)
Answer:
1) 15.6
2) 2.03
Explanation:
The power output of the electric toaster, P = 2,400 W
The voltage rating of the power outlet, V = 120 V
The number of hours the toaster is used during a month = 6.5 hours
1) Electrical energy, E = Electrical power, P × Time, t
The electrical energy dissipated by the toaster, 'E', is given as follows;
E = 2,400 W × 6.5 hrs = 15,600 Wh = 15.6 kWh
The electrical energy dissipated by the toaster, during the measured month in kWh, E = 15.6
2) Let 'C' represent the monthly cost of toaster and let 'B' represent the amount charged by the local power company, we have;
The charges for (electrical) power by the local power company, B = $0.13/kWh
The monthly cost of the toaster, C = E × B
∴ C = 15.6 kWh × $0.13/kWh = $2.028
By rounding off to 2 decimals, the monthly cost of the toaster (in $), C ≈ 2.03.
3. A crane can lift a 5000 N object to height of 30 m in 120 seconds. The power at which the crane is
operating is:
a 125 Watts
b. 1250 Watts
c. 7500 Watts
d. 250,000 Watts
A single output device has failed while the remainder of the PLC system is functioning normally The indicator light on the output module indicates that a signal is sent to the output point where the device is connected. You would now:
a) trace the circuit back through the logic to locate the inputs.
b) use a programming terminal to call up the rung that controls the output to see if the output coil is on.
c) check the point where the output device's field wiring is connected to the output rack.
d) check the input modules for short-circuit conditions.
Answer:
check the point where the output device's field wiring is connected to the output rack. ( C )
Explanation:
Given that an indicator light on the output module is indicating that a signal has been sent to the output point where the failed single output device is connected , the best line of action to properly indicate the output device that has filed in the PLC system, is to check the point where the output device's field wiring is connected to the output rack in the PLC system.
A PLC system is a computer control system ( especially Industrial ) that helps in the monitoring the states of input and output devices in an industry.
True or false blood gets oxygen and releases carbon dioxide in the heart
Answer:
FALSE
Explanation:
You breath in oxygen and your blood takes it through your body then you breath it out as carbon dioxide
Bobby and James were suffering from headaches. At seven o’clock, Bobby took the recommended two tablets of medicine for his headache; James took a dose of the powdered form of the same medicine. Using the assumption that the medicine effectively cures a headache, which person’s headache is likely to subside first? Use details and data from the students’ experiment and your prior knowledge to explain why you think this is.
Answer: James headache will subside first
Explanation: powder medicines usually get absorbed faster therefore having a quicker effect
A bullet from a policeman's handgun travels at 200 meters per second and has a mass of 0.02 kg.
What is the bullet's kinetic energy?
Answer:
K.E = 400
Explanation:
Given the following data;
Mass = 0.02kg
Velocity = 200m/s
To find the kinetic energy;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the formula, we have;
[tex] K.E = \frac{1}{2}*0.02*200^{2}[/tex]
[tex] K.E = \frac{1}{2}*0.02*40000 [/tex]
[tex] K.E = 0.02*20000 [/tex]
K.E = 400
It takes 8.76 hours to travel 427 miles Northwest from Chicago, Illinois to Minneapolis, Minnesota. What is your velocity for the trip?
Answer:
infinity
Explanation:
this is because time is irrelevant
Which of the following statements best explains the relationship between the common property regime and energy distribution? The common property regime ____.
may lead to inequitable availability of energy resources or, worse, scarcity
is the direct result of energy security
regime will provide energy security
will prevent energy scarcity
Answer:
the anser is B
Explanation:
please help me out i'm so depressed and such a failure
how does the brightness of the lamp (L) vary if we dispalce the cursor (C) of the rheostat
a)Towards A
b) Towards B
Answer:
ok so first ur not a failure and its okay don't be so hard on ur self
<3
Which of these waves CANNOT travel through the vacuum of space?
A) microwaves
B) radio waves
C) light waves
D) sound waves
the zinc plate is coated with mercury
describe two effects of weathering on a cliff
Answer:
In coastal areas, strong winds and powerful waves break off soft or grainy rocks from hardier rocks. Too much weathering occurs, it might break off parts of the cliff and be dangerous to humans, or animals.
Rain has acid in it which could eat up the cliff.
Explanation:
two difference between hydraulic brake and hydraulic lift
Answer:
hydraulic lift pump moves the lift piston out in a series of movements. and a hydraulic brake moves it out in one short break.
skater spins over a point at a speed of 3.0 rotations per second then the momentum of inertia is 0.60 kg.M2, what is its angular momentum?
Answer:
[tex]L=11.3\ kg-m^2/s[/tex]
Explanation:
Given that,
Angular speed of a skater, [tex]\omega=3\ rot/s=18.84\ rad/s[/tex]
The moment of inertia of the skater, I = 0.6 kg-m²
We need to find the angular momentum of the skater. The formula for the angular momentum of the skater is given by :
[tex]L=I\omega[/tex]
Substitute all the values,
[tex]L=0.6\times 18.84\\\\L=11.3\ kg-m^2/s[/tex]
So, its angular momentum is equal to [tex]11.3\ kg-m^2/s[/tex].
Starting from the results of Examples 5.4 and 5.5, estimate the number of cubic meters of water that would flow each second through an OTEC plant large enough ( 1000 M W e 1000 MWe) to provide electricity for Miami. Use the approximation of an ideal heat engine as in the examples. If this water flows at a velocity of 4 m / s 4 m/s, what would be the necessary diameter of the pipes?
Answer: Hello Results of examples 5.4 and 5.5 are missing from your question but I was able to find it online and use it to resolve your question
answer :
a) 1780 m^3/sec
b) 23.81 m
Explanation:
a) calculate the number of m^3 of water flowing through an OTEC plant charge
assumption : assuming an ideal heat engine
Q / t = m*c*∆T * (eff) / t
1e^9 J/s = 1g/cc *V(1cal/g°C) * 2°C (6.7%)*(4.184J/cal) / t
Hence: V / t ( number of m^3 of water ) = 1.78e^9 cc / sec = 1.78 * 10
= 1780 m^3/sec
b) Determine the diameter of pipes
Given that the water flows at 4m/s ( velocity )
1780 m^3 /sec = A * V ------ ( 1 )
A = π*d^2/4 = 1780 / 4 = 445 m^2 -------- ( 2 )
v = 4 m/s
Back to equation 2
d^2 = ( 445 * 4 ) / π
≈ 567
∴ necessary diameter ( d ) = [tex]\sqrt{567}[/tex] = 23.81 m
Please answer needed as soon as possible, will give brainlest...fill in the question mark area! No files, cant access on a school computer thank you!!!!
The advantage of using a machine is that we apply less ??? at the input for the work done at the output.
Answer:
That is because we apply less Work.
Brainliest?? I hope this helps!!!
Explanation:
How dose the speed of the sound differ in water, iron, and Helium?
Answer:
air water iron helium
v(m/s) 280 2200 17780 39682
Explanation:
The speed of a wave depends on the physical properties of the medium where it travels, in the case of a longitudinal wave such as sound, it depends on the resistance to deformation (volume modulus and the density of the medium
v = [tex]\sqrt{ \frac{B}{ \rho } }[/tex]
in the mentioned materials they are constant
air water iron helium
B 1 10⁵ 2.2 10⁹ 140 10⁹ 0.05 10⁹
ρ 1.28 997 7874 1.26
v(m/s) 280 2200 17780 39682
which of the following is not a main function of the human's body nervous system?
Answer:
I can't see option dear
Explanation:
b) The ice cube melting on the nonconducting plate
Is it conduction,convention, or radiation thermal energy
Answer:I think it’s convection
Explanation:
Please help giving a lot of points- A rollercoaster cart that has a mass of 4500 kg has 67.5 kJ (kilojoules), or 67,500 J (joules), of gravitational potential
energy. What is its height above the ground?
PT.2
The same 4500 kg rollercoaster cart is moving with 63.0 kJ (kilojoules), or 63,000 J (joules), of kinetic energy at the
bottom of its biggest hill. What is its velocity?
Answer:
(a) h = 1.5 m (b) v = 5.29 m/s
Explanation:
1. Given that,
Mass of a rollercoaster cart, m = 4500 kg
It has 67,500 J of gravitational potential energy.
We know that, the gravitational potential energy is given by :
[tex]E=mgh[/tex]
Put all the values,
[tex]h=\dfrac{E}{mg}\\\\h=\dfrac{67500}{4500\times 10}\\\\h=1.5\ m[/tex]
2. The kinetic energy of an object is given by :
[tex]E=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2E}{m}}\\\\v=\sqrt{\dfrac{2\times 63000}{4500}}\\\\v=5.29\ m/s[/tex]
Hence, this is the required solution.
If a body is thrown up with an initial velocity 'u' and covers a maximum height of 'h' , then 'h' is equal to u²/2g
Explain in detail.
Answer:
1/2 m u^2 initial Kinetic Energy of body
m g h Potential Energy body attains as it rises to height
1/2 m u^2 = m g h conversion of KE to PE
h = u^2 / ( 2 g)
the natural radioactivity is done by(controlling the nuclear energy-no ability to control the nuclear energy-both of them)
Answer:
Nuclear power plants are fueled by uranium, which emits radioactive substances. Most of these substances are trapped in uranium fuel pellets or in sealed metal fuel rods. However, small amounts of these radioactive substances (mostly gases) become mixed with the water that is used to cool the reactor.
A 0.7 tennis ball is thrown with a velocity of 20 m second to the right what is the momentum of the tennis ball
Explanation:
Momentum of an object is defined as the product of the mass of object and the velocity with which it is moving.
p = mv
where, p = momentum, m= mass and v= velocity
mass m = 0.7 Kg and v = 20 m/s
p = 0.7×20 = 14 Kg-m/sec
Therefore, momentum of the object = 14 kg-m
If you're the white mouse, what will you do in order for you to survive
Answer:
If I was the white mouse, I would either find somewhere to hide that matches my fur color to camoflouge with or dig into the dirt so less visible.
To find white colour habitat.
What will I do for my survival?If I was the white mouse, I would find white colour place for living because in that white colour the predators can't see me and i will be safe from them so we can conclude that finding white colour habitat is the best choice to safe myself.
Learn more about survive here: https://brainly.com/question/24323334
help meeeeeeeeeeee
what is the rheostat and what its ruleeee??
Answer:
Rheostat:=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.
Principle / Rule:=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.
[tex] \infty \infty \infty [/tex]
A taxi is travelling at 15 m/s. Its driver accelerates with
acceleration
[tex] {3m.s}^{2} [/tex]
for 4 s. What is its new velocity?
A pelican flying along a horizontal path drops a fish from a height of 12.3 m. the fish travels 16.0m horizontally before it hits the water below. What is the Pelican's initial speed?
Answer:
10.1 m/s
Explanation:
Let the coordinates of the pelican's position be (x, y).
Now, since it is dropped from a height of 12.3 m, then initial velocity is zero and using Newton's 2nd law of motion, we have;
12.3 = 0 - ½gt²
½gt² = 12.3
t² = 12.3 × 2/9.8
t² = 2.51
t = √2.51
t = 1.5843 s
Now, it travels 16.0m horizontally before it hits the water below. Using the formula, distance = speed × time, we have;
16 = v_x•t
Thus;
16 = v_x × 1.5843
v_x = 16/1.5843
v_x = 10.1 m/s
Now, the velocity in the vertical y-direction is zero.
Thus;
v = √((v_x)² + (v_y)²)
v = √((10.1² + 0²))
v = 10.1 m/s
Which of the following quantities is inversely proportional to the gravitational pull between two objects?
(A) The sum of their masses
(B)The sum of their volumes
(C) The square of the distance that separates them
(D) The distance from their center to their surface
Answer:
C
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces
I hope this helps a little bit
The correct Option is :
=》(C) The square of the distance that separates them
[tex]f \: \: \dfrac{1}{ \alpha } \: \: r {}^{2} [/tex]where,
f = gravitational force
r = distance between the objects