Answer:
Since energy means capacity to do work, when stone is in ground level, it has 0 work because it doesn't covered any distance but when stone lifted at a certain height , it covered a certain distance and work is done. Thus same stone has energy when it is lifted at a height .
Explanation:
A 200-kg boulder is 1000-m above the ground.
a) What is its potential energy when it is 1000-m above the ground?
Answer: 1,960,000 J
Explanation:
According to the diagram, which choice has the shortest wavelength?
A) infrared
B) red visible light
C) blue visible light
D) yellow visible light
Answer:
Blue visible light
Explanation:
the distance between the crests of the waves is the shortest
How much work is needed to move horizontally a body 20m by a force of 30N the angle between the body and the horizontal surface is 60 degree?
Work done in moving the body horizontally is 300 J.
What is meant by work done by an object ?Work done by an object is defined as the dot product of the force and displacement of the object.
Here,
Displacement of the body, s = 20 m
Force applied on the body, F = 30 N
Angle made with the horizontal, θ = 60°
Work done in moving the body,
W = Fs cosθ
W = 30 x 20 x cos60
W = 600/2
W = 300 J
Hence,
Work done in moving the body horizontally is 300 J.
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For the circuit shown in the figure(figure 1) find the current through each resistor. Express your answers using two significant figures. Enter your answers numerically separated by commas.
The current flowing in each resistor of the circuit is 4 A.
Equivalent resistance of the series resistors
The equivalent resistance of the series circuit is calculated as follows;
6 Ω and 4 Ω are in series = 10 Ω
5 Ω and 10Ω are in series = 15 Ω
Effective resistance of the circuit[tex]\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} \\\\R = \frac{R_1R_2}{R_1 + R_2} \\\\R = \frac{10 \times 15}{10 + 15} \\\\R = 6 \ ohms[/tex]
Current flowing in the circuitV = IR
I = V/R
I = 24/6
I = 4 A
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What is the formula for the initial temperature
Q = mc(T - t0) it is the formula for the initial temperature
which chemical equation is balanced?
Answer:
C no.Explanation:
Mark me me brainliest plz i really need it （⌒▽⌒）Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
which option is the best blackbody radiator?
Answer: The sun
Explanation: Trust me bro?
Which best describes the current atomic theory? (1 point) a Since it is only a theory it should not be used in practice. b It has not been tested enough to be useful for developing technology. c It is the most powerful explanation scientists have to offer at this time. d There is very little chance it will be changed in the future.
Answer:scientist try to fix it
Explanation:
1. A scientist wants to raise the temperature of a
100 gram sample of glass from -45°C to 15°C. How
much heat energy is required to cause this change?
Specific heat of glass 0.800J/gºC.
Here Given,
Mass = 100 gram
Change in temperature = -45°C - 15°C => -55°C
Specific heat of glass (c) = 0.800J/g°C
★Heat Energy (Q) = mc∆t
➙ 100g × (-55)°C × 800/1000 J/g°C
➙ 10 × (-55) × 8
➙ -4400 J
★ Hence, Heat Energy is required to cause this change -4400 J = 4400J
______________________________________
if a pair of forces are in the same direction but with different magnitudes these forces are
A. balanced
B. unbalanced
C. in equilibrium
D. non-existent
How many countries have not adopted the metric or si system?.
Answer:
Three countries
Which are United States, Liberia, and Myanmar
Imagine you are mpho:how can you help your friend (phenyo) not to be influenced by media? you really feel she needs some help because she is neglecting her school work write 2 paragraphs
One of the ways to help someone not to be influenced by media is:
Encourage independent thinking.Let her know that she should make sure the information she is consuming is free from bias and is factual.What is Media Influence?This refers to the effects and reactions which the mass media has on the people who listen to them by shaping their views and by controlling the narrative.
With this in mind, we can note that if a person is overtly influenced by the media, then such a person lacks independent thinking and becomes emotional by what he watches on the television or reads from an online source.
This can be changed through the encouragement of independent thinking, and the need to check for factual information from the media news and also to focus more on studies.
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According to the diagram, (UV) ultraviolet light has a longer wavelength than
A) radio waves
B) infrared
C) x-rays
D) microwaves
Answer:
c. x-rays
Explanation:
my Exams are coming.so, please tell me some ways to score good marks?
Instead of asking this question go and study
Oil having a density of 922kg/m^3 floats on water. A rectangular block of wood 3.97 cm high and with a density of 963 kg/m^3 floats partly in the oil and partly in the water. The oil completely covers the block. How far below the interface between the two liquids is the bottom of the block? Answer in units of m.
Explanation:
For the equilibrium:
\rho_{wood}gh-\rho_{oil}g(h-x)-\rho_{water}gx=0ρ
wood
gh−ρ
oil
g(h−x)−ρ
water
gx=0
\rho_{wood}h-\rho_{oil}(h-x)-\rho_{water}x=0ρ
wood
h−ρ
oil
(h−x)−ρ
water
x=0
(974)(3.97)-928(3.97-x)-1000x=0(974)(3.97)−928(3.97−x)−1000x=0
x=2.54\ cmx=2.54 cm
79.8329 + 3.179 + 6.5263
And round
Answer:
90.0
Explanation:
Because 78.8329 + 3.179=83.0119
83.0119 + 6.5263=89.5382 rounded up is 90.0000
Hope this helps have a awsome afternoon:)
Which of the following would most likely cause a decrease in the quality supplied
AWhich of the following would most likely cause a decrease in the quantity supplied? A decrease in price.
To view an enlarged upright image of an object through a simple magnifier, where must the object be located?.
Answer:within the focal length of the lens, provided the focal length is shorter than the near point distance.
Explanation:Hope it helps
A rollercoaster is designed as shown below. If the roller coaster starts at the top of the
first hill from rest, describe what will happen to the rollercoaster. How could you fix this
problem?
Does the velocity of the center of mass change in a collision.
Answer:
The velocity of the system's center of mass does not change, as long as the system is closed. The system moves as if all the mass is concentrated at a single point.
Topics:
1. Explain the causes of ocean currents around the world.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the substances involved.
2. Explain features of a thermal food container that can help to keep food
warm.
Refer to at least 2 types of heat transfers.
Refer also to the specific heat capacity of the materials used.
I need you to make me an invented poem written please not in image
The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Answer:
Rubber or plastic covers are bad conductors of electricity. So they do not allow the electric current to pass through it.
Explanation:
Rubber and plastic are bad conductors of electricity, therefore when handling a tool with a rubber handle, the electricity will not pass through it.
Answer:
rubber and plastic are insulators and are bad conductors of electricity
When someone hits a wooden board, what is the action force? What is the reaction force?
Answer:
The board did exert an equal and opposite force, but your mass is considerably greater than the mass of the board so all the friction between you and the ground keeps you from accelerating.
If you punched the board while standing on perfectly slippery ice, or in a vacuum, you would accelerate also, but at a much smaller rate than the board due to the mass difference.
If you could ignore all losses (friction, the board breaking, etc.) then all Newton's 3rd Law really is saying is that the center of mass of the system doesn't change when you punch the board. So the board accelerates in the direction of your punch and you move away from it at rates that keep the system center of mass constant.
Explanation:
Straight line AB connects two point sources that are 5.00 m apart, emit 300 Hz sound waves of the same amplitude, and emit exactly out of phase.
(a) What is the shortest distance between the midpoint of AB and a point on AB where the interfering waves cause maximum oscillation of the air molecules?
(b) What are the (b) second and (c) third shortest distances?
what is the velocity of a plane that traveld 3000 miles from new york to california in 5.0 hours
What is the atomic bomb equivalent of energy released during a 7. 0 quake? an 8. 0 quake? a 9. 0 quake?
Answer:
7. 0 = 500 kilotons of TNT = 2.0 x 10^15 joules
8.0 = 15 million tons of TNT = 6.3 x 10^16 joules
9.0 = 500 million tons of TNT = 2.0 x 10^18 joules
atomic bomb dropped on Hiroshima had a equivalent of 15 kilotons TNT
Explanation:
formula :
log E = 5.24 + 1.5M
M is richter scale magnitude
if 8.3 = richter scale magnitude
log E = 11.8 + 1.5M Write the formula.
log E = 11.8 + 1.5(8.3) Replace M with 8.3.
log E = 24.25 Simplify
10^log E = 10^24.25
E = 10^24.25
E ≈ 1.78 x 10^24 ergs ≈ 1.78 × 1017 joules
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Among the substances given below which cannot be electrified by friction
amber, plastic, hacksaw blade
Answer:
Hacksaw blade because it is metal.
Which statements describe vectors?
Answer:
Vectors have a size and direction. Each of the existing vector quantity has a magnitude and a direction. Having direction along with the magnitude is the difference of a vector quantity from a scalar quantity. Vectors are indicates with arrows.
Vectors are quantities which have both magnitude and direction.
What are vectors?Vectors are quantities which have both magnitude and direction.
Vectors are different from scalars which have only magnitude but no direction.
Vectors are represented by arrow written above them.
The sum of vectors are not obtained by ordinary algebraic additions, but by vector additions.
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92.BIO In an emergency situation,
a person with a broken forearm
ties a strap from his hand to clip
on his shoulder as in Figure P8.92.
His 1.60-kg forearm remains in a
horizontal position and the strap
makes an angle of 0 = 50.0° with
the horizontal. Assume the fore-
arm is uniform, has a length of
l = 0.320 m, assume the biceps
muscle is relaxed, and ignore the
mass and length of the hand. Find
(a) the tension in the strap and
(b) the components of the reac-
tion force exerted by the humerus
on the forearm.
Based on the principle of equilibrium of forces:
the tension T, in the strap is 10.2 Nthehorizontal component of the reaction, Rx is 6.56 Nthevertical component of the reactionary force, Ry is 7.84 NWhat is tension?Tension is a type of force that is transmitted through a flexible medium such as a cable, wire or string pulled tight by forces acting from opposite ends.
The tension in the strap is calculated as follows:
Taking sum of moments from the right end as equal to zero:
mg × l/2 = Tsinθ × l
T = mg/2sinθ
T = 1.60 × 9.8 / 2 sin 50°
T = 10.2 N
Calculating the components of the reac-
reac-tionary force:
Horizontal component is RxVertical component is RyFrom Newton's third law:
Rx = Tcosθ
Rx = 10.2 × cos 50°
Rx = 6.56 N
Ry - Tsinθ = 0
Ry = Tsinθ
where;
T = mg/2sinθ
Ry = mgsinθ/2sinθ
Ry = mg/2
Ry = 7.84 N
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