Answer:
E = 0.4 kWh
Explanation:
Given that,
The power of a bulb, P = 40 W
Time, t = 10 hours
We need to find the energy used by the bulb. Let it is equal to E. So,
[tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]
So, 0.4 kWh of energy would be needed.
Answer: 146,000 Wh or 146 kWh
Explanation:
65 days × 10 hours × 40 W = 146,000 Wh or 146 kWh
HELP I WILL MARK AS BRAINLIEST!
Answer:
it is c
Explanation:
8. An effort force of 15 Newtons is applied to an ideal pulley system to lift up a 16 Newton object. If the effort force is exerted through a distance of 6 meters, calculate the distance that the object is raised above its initial position.
Answer:
the distance that the object is raised above its initial position is 5.625 m.
Explanation:
Given;
applied effort, E = 15 N
load lifted by the ideal pulley system, L = 16 N
distance moved by the effort, d₁ = 6 m
let the distance moved by the object = d₂
For an ideal machine, the mechanical advantage is equal to the velocity ratio of the machine.
M.A = V.R
[tex]M.A = \frac{Load}{Effort} = \frac{L}{E} \\\\V.R = \frac{disatnce \ moved \ by \ the \ effort}{disatnce \ moved \ by \ the \ load} = \frac{d_1}{d_2} \\\\For \ ideal \ machine; \ M.A = V.R\\\\\frac{L}{E} = \frac{d_1}{d_2} \\\\d_2 = \frac{E \times d_1}{L} \\\\d_2 = \frac{15 \times 6}{16} \\\\d_2 = 5.625 \ m[/tex]
Therefore, the distance that the object is raised above its initial position is 5.625 m.
Which type of electromagnetic wave has the lowest frequency?
A. Infrared light
B. Visible light
C. X-rays
D. Gamma rays
The type of electromagnetic wave that has the lowest frequency is infrared light (option A).
What is an electromagnetic wave?Electromagnetic spectrum is the entire range of wavelengths of all known electromagnetic radiations.
The electromagnetic spectrum extends from the following waves:
gamma raysX-raysvisible lightinfraredradio waves.The frequency of each electromagnetic wave is as follows:
Gamma ray: 10²⁰ – 10²⁴X-rays: 10¹⁷– 10²⁰Visible light: 10¹⁵– 10¹⁷Infrared: 10¹³ – 10¹⁴radio waves: < 3 x 10¹¹Therefore, infrared light has the lowest frequency of the options.
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Answer: Infrared light
Explanation: I took the test
Ball A has a mass of 50 kg. Ball B has a mass of 75 kg. Both move at the same velocity. Which has a greater momentum?
Answer:
Ball B
Explanation:
I say this because its the heavier one?
The momentum of a body increases with increase in mass. Hence, among the two balls, the ball with the greater mass that is ball B has the greater momentum.
What is momentum ?Momentum is the ability of a moving object to bring the force effective to make maximum displacement. It is the product of mass and velocity.
P = mv
Thus, as the velocity and mass increases, the momentum increases. The force applied on a body with greater mass makes greater acceleration and greater momentum.
Therefore, at constant velocity, the object with the greater mass will have the greater momentum. Then, the ball with 75 kg mass is having the greater momentum.
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In the Sun, fusion reactions create helium nuclei. To form each helium nucleus, four hydrogen nuclei fuse. The four hydrogen nuclei have a greater total mass than the newly formed helium nucleus. Which statement explains this difference in mass?
Answer:
the mass deficit is directly proportional to bond reeling
Explanation:
The effect of the mass deficit in the nuclei is
δ = m_nucleons - m_nucleo
the delta quantity is the binding energy of the atomic nucleus,
This mass is related to energy by the Einstein relation
ΔE = c² Δm
therefore the mass deficit is directly proportional to bond reeling
Answer:
C. Some of the mass of the four hydrogen nuclei was converted into
energy
Explanation:
Ap3x
Identifying Obstacles
Since the purpose of these strategies is to help overcome obstacles and set-backs in your exercise routine, take a minute and think about the most obvious obstacle you have. If you do not have any obstacles at the present time, think about a potential obstacle to your exercise that could occur.
Answer:
Thx!
Explanation:
9. Si en una probeta colocamos 25 ml de aceite, 50 ml de agua y 20 g de
mercurio y mezclamos las sustancias. ¿Qué sustancia queda en la
superficie?
¿Cuál en la Interfase?
y ¿Cuál en el fondo de la
probeta?
DEL ESTADO DE
BAJA CALIFORNIA
Answer:
the order of liquids from bottom to top is Mercury - Water - Oil
Explanation:
In general, when several substances are mixed we can have two cases, that the substances dissolve some enter and that the substances have not been miscible (insoluble) this is our case, the three substances do not dissolve.
Therefore they must be deposited according to the principle of Archimedes,
B -W = 0
if the thrust (B) of the liquid is greater than the weight of the upper body, the body floats and if less, the body sinks.
B = ρ_{liquid1} g V_{liquid2}
W = m_{liquid2} g
substance densities are tabulated
ρ_{oil} = 750 to 950 kg / m3
ρ_ water = 1.00 10³ kg / m³
ρ_ Hg = 13.6 10³ kg / m #
The thrust created by the mercury is
B_Hg = ρ_Hg g V_ Liquid2
B_Hg = 13.6 10³ 9.8 V
B _Hg = 133.3 10³ V
The push of the water
B_water = 1 10³ 9.8 V
B_water = 9.8 10³ V
The oil density, let us use ρ_oil = 0.75 10³ kg / m³
B_ oil = 0.750 10³ 9.8 V
B _ oil = 7.35 10³ V
let's find the volumes of the bodies
Mercury
ρ = m / V
V_hg = m /ρ_Hg
V_Hg = 20 10⁻³/ 13.6 10³
V_Hg = 1.47 10⁻⁶ m³
Water
V_water = 50 10⁻³ L
we reduce from liter to m³ 1000 l = 1 m³
V_water = 50 10⁻⁶ m³
Oil
V_oil = 25 10⁻³ l
V_oil = 25 10⁻⁶ m³
Let's look for the push for every two substances
The mercury in the bottom and upper sustabce the water and oil
B_hg = 133.3 10³ (V_water + V_oil)
B = Hg = 133.3 10³ (50 + 25) 10⁻⁶
B = 10 N
the weight of substance on mercury is
W = W_water + W_oil
W = ρ_water g V_water + ρ_oil g V_oil
W = g (ρ_water V_water + ρ_oil V_oil)
W = 9.8 (1 10³ 50 10⁻⁶ + 0.75 10³ 25 10⁻⁶)
W = 9.8 68.75 10⁻³
W = 6.7 10⁻¹ N
We can be that the weight of this substance in less than the push created by the mercury therefore they float.
In resume the mercury is the substance that will be at the bottom of the cylinder.
Let's repeat the calculation for water and oil.
Suppose the water is below
B₂ = ρ_water g V_oil
B₂ = 1 10³ 9.8 25 10⁻⁶
B₂ = 245 10⁻³ N
B₂ = 2.5 10⁻¹ N
The weight of the oil
W = ρ_oil g V_oil
W = 0.750 10³ 9.8 25 10⁻⁶
W = 183.75 10⁻³
W = 1.8 10⁻¹ N
we see that the thrust of the water is greater than the weight of the oil therefore the oil floats in the water
In summary the order of liquids from bottom to top is
Mercury - Water - Oil
Calculate the velocity of:
A bus travelling through town, with a mass of 5040 kg and kinetic energy of
493,900 J.
Answer:
solution
given,
mass(m)=5040kg
kinetic energy(ke)=493,900
velocity(v)=?
[tex]ke = \frac{1}{2} mv {}^{2} \\ 493900 = \frac{1}{2} \times 5040 \times v {}^{2} \\ 493900 = \frac{5040v {}^{2} }{2} \\ 493900 = 2520v {}^{2} \\ v {}^{2} = 196 \\ v = \sqrt{196} \\ v = 14ms {}^{ - 1} [/tex]
When an object moves from one point to other point, it possess the energy which is called the Kinetic energy of the object.
The velocity of he bus is 14 m/s.
Given that, a bus travelling through town, with a mass of 5040 kg and kinetic energy of 493,900 J.
So the kinetic energy expressed by the formula given below.
[tex]k=\dfrac {1} {2}mv^2[/tex]
Where, [tex]k[/tex] is the kinetic energy in joules, [tex]m[/tex] is the mass of object in kilograms and [tex]v[/tex] is the velocity of the object in meter per second.
So the velocity of the bus can be calculated by substituting the values in above formula.
[tex]493900=\dfrac{1}{2}\times5040\times v^2[/tex]
[tex]v^2=196\\\\v=\sqrt{196}\\v=14\;\rm m/s[/tex]
The velocity of he bus is 14 m/s.
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Which of the following can act
as media for a wave?
A. Solids
B. Liquids
C. Gases
D. All of the above
Answer:
D
Explanation:
im pretty sure
What is the length of the y-component of the vector plotted below?
Answer:
A.1
Explanation:
on the vector plot you should count up and if you count up you´ll get one
The length of the y-component of the vector plotted in the given question would be 1. Thus, the correct option is A.
What is a vector plot?A vector field can be defined as an assignment of a vector to each point in the subset of space. For instance, a vector field in the plane can be easily visualized as a collection of arrows with a given magnitude and direction of a particle, each line or arrow attached to a point in the plane of space.
Vector plots are used to create vector lines between any two points or from one point in space to the specified angle direction and with the selected magnitude and direction of the quantity or quality.
In the given graph, the Y-component is the vertical line or vertical component. The value of the y-component of the vector plotted is 1.
Therefore, the correct option is A.
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What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.30 m?
Answer:
Explanation:Wave speed = 100 ×0.50 meter per second . Wave speed = 50 meter per second .
True or False?
waves transfer the material from one location to another
Answer: False
Explanation:
What is directly created when radiation from the Sun heats air in the atmosphere?
erosion
humidity
precipitation
wind
Answer:
Wind
Explanation:
I had this question on one of my tests, and I got it right
can u get this right?
What percentage of high school students did not meet the recommended level of physical activity in one study?
A.
25%
B.
45%
C.
65%
D.
85%
Answer:
c
Explanation:
what poping
What is the momentum of a bird with a mass of 0.018kg flying at 15m/s?
Answer:
0.27 kg-m/s
Explanation:
i believe this is the correct answer
Hamid is going to heat sodium chloride and water in a beaker. How can he carry out his experiment as
safely as possible?
[4 marks]
Answer:
he can wear gogles lab coat and gloves
Explanation:
A student looks at the image of a ball rolling down a ramp. The image shows four different positions for the ball Use this image to answer Questions 4–5 are attached.
The law of conservation of energy states that energy is always conserved, and cannot be destroyed.
At the top of the hill, the ball is at the maximum height. Because the equation for gravitational potential energy is ([tex]U_{g}[/tex] = mgH), we can safely conclude that the GPE at A, the top of the hill, is the greatest in all 4 options.
Now, what about Kinetic Energy? Recall the law of conservation of energy. At the point where Gravitational Potential Energy is the lowest, Kinetic Energy will be the highest. Total energy is always conserved, and so it is logical that KE will increase to compensate for GPE decreasing. Therefore, we know that at point C, the ball will have the greatest Kinetic Energy. Because this point is the lowest point in the hill, the ball will have the lowest possible GPE and therefore the largest possible KE out of the 4 options.
4. A
5. C
If you're still confused or would like me to explain this further, just ask!
- breezyツ
Titan Tommy and the Test Tubes at a nightclub this weekend. The lead instrumentalist uses a test tube (closed-end air column) with a 17.2 cm air column. The speed of sound in the test tube is 340 m/sec. Find the frequency of the first harmonic played by this instrument.
Hello , it' s 5 but i am not sure Explanation:
Materials that hold electrons very tightly, and thus don't allow much static electricity to occur around them, are called
what is the total equivalent resistance of the circuit?
R1= 5Ω, R2= 3Ω, R3= 4Ω, R4= 1Ω, R5= 2Ω
Two charged objects have a repulsive force of .080 N. If the charge of both of the objects is doubled, then what is the new force?
heyy have a nice day yixxixigx
Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answer:
I believe it's D. a glacier flattening the land below it.
What is the solution to unit for measuring electric current?
Answer:
The SI unit for electric current is Ampere (A)
Question :
⇒Define Force
In physics, a force is any interaction that, when unopposed, will change the motion of an object.
[tex] \\ [/tex]
A lens with f = 35.0 cm is held
42.0 cm from an object. Where
does the image form?
Answer: 210 cm
Explanation:
Look up Thin Lens Equations Calculator- it helps!
What is required for the heat to flow from one object to another?
Uniform temperature
Uniform density
Temperature difference
Density difference
Answer:
Explanation:
The answer is Temperature difference
Answer:
C
Explanation:
is the answer ,..........................
Explain how tangential speed depends on distance.
Complete the following sentence.
The Richter scale is used to compare the
_____ of earthquakes.
Answer:
magnitude
Explanation:
The Richter scale compares the magnitude or energy of earthquakes
Find the wavelength of a transverse wave the frequency of the wave motion is 3 Hz and the wave travels with a velocity of 48 m/s .
Answer:
16 m
Explanation: