Answer:
mercury ,venus, earth
Answer
sunplanets moonscometshope this helps
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good luck! have a nice day!
A block is sliding along a horizontal surface with 100 J of kinetic energy. The kinetic frictional force stops the block in 5 seconds.
What is the rate (in J/s) at which the force of kinetic friction does work?
Answer:
20 J/s
Explanation:
Given data
Kinetic energy=100 J
Time= 5 seconds
Hence the rate at which the kinetic friction work is
=100/5
=20 J/s
Therefore the answer is 20 J/s
Which of the following is classified as a good electrical conductor?
Question 3 options:
rubber
plastic
glass
copper
air
Answer:
copper
Explanation:
wires use copper to conduct electrictiy
Answer:
Explanation:
Copper is the answer; as it is metal and metals are famous for conducting electricity, but plastic,rubber and glass are nonmetals.
A spaceship traveling in space at a constant velocity of 800ms-1
launches a probe towards a distant
planet.if
the probe is launched with a velocity relative
to the spaceship.
of
600 ms-1 in a direction at right
angles to
the
Flight path of
the spaceship,Calculate the resultant velocity of the probe
The resultant velocity of the probe is 1000 ms-1 at an angle of 36.87 degrees relative to the flight path of the spaceship.
What is a vector sum?A vector sum, also known as a vector addition, is the process of combining two or more vectors to find a resultant vector. The vectors being added together can be in any dimension, such as two-dimensional or three-dimensional. The process of vector addition is represented graphically by placing the tail of one vector at the head of another vector, and then drawing a vector from the tail of the first vector to the head of the second vector.
To find the resultant velocity, we can use the Pythagorean theorem to find the magnitude of the velocity vector and the angle between the two velocity vectors.
The magnitude of the velocity vector is the square root of (800^2 + 600^2) = 1000 ms-1.
The angle between the two velocity vectors can be found by using the inverse tangent function (arctan), where tan(θ) = opposite/adjacent, which is arctan(600/800) = arctan(0.75) = 36.87 degrees.
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150 ml
Water at 22 °C
Iron at
125 °C
What is a possible
temperature of the
system after the iron
has been added to
the beaker?
A. 147 °C
B. 52°C
C. 125 °C
D. 19 °C
The possible temperature of the system after the iron has been added to the beaker is 52°C.
option B.
What is equilibrium temperature?A system is said to be in thermal equilibrium when there is no temperature difference between system and surroundings. Temperature, as you know, measures how hot or cold a body is with respect to a standard object.
When a system ( cold and hot body) reaches thermal equilibrium or equilibrium temperature, the heat lost by the hot body will be equal to the heat gained by the cold body.
heat gained by the water = heat lost by the iron
The equilibrium temperature will be greater than the initial temperature of the cold body but less than the final temperature of the hot.
Thus, the only possible answer for the equilibrium temperature of mixture is 52⁰C.
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A certain gas has a volume of 600 cm3. What is its volume if the pressure is changed to one-third its original value?
ANSWER:
1800 cm³
STEP-BY-STEP EXPLANATION:
Initial volume (V1) = 600 cm³
We know that the pressure is reduced to one-third of the initial pressure, therefore:
\(\begin{gathered} V_1\cdot P_1=V_2\cdot P_2 \\ \\ P_2=\frac{1}{3}P_1 \\ \\ \text{ We replacing:} \\ \\ 600\cdot P_1=V_2\cdot\frac{1}{3}\cdot P_1 \\ \\ 600=\frac{1}{3}V_2 \\ \\ V_2=600\cdot3 \\ \\ V_2=1800\text{ cm^^b3} \end{gathered}\)The volume would be 1800 cm³
How much ground do you travel if you travel for 149.81 seconds at a speed of 53.70 m/s.
\(\\ \bull\tt\dashrightarrow Distance=Speed\times Time\)
\(\\ \bull\tt\dashrightarrow Distance=149.81(53.70)\)
\(\\ \bull\tt\dashrightarrow Distance=8044.7m\)
A studious physics student is interrupted by a swarm of bees and chased off a cliff. Since she has her calculator in hand she quickly punches in numbers to figure out the initial velocity she needs to make it into the lake below. The cliff is 10 m high and the lake is 15 m away from the edge of the cliff. Find the time it takes her to drop. Find her initial velocity,
Answer:
The time is 1.4 sec
The initial velocity is 10.7 m/s.
Explanation:
Given that,
Height = 10 m
Distance = 15 m
We need to calculate the time
Using equation of motion
\(s=ut-\dfrac{1}{2}gt^2\)
Put the value into the formula
\(10=0+\dfrac{1}{2}\times9.8\times t^2\)
\(t^2=\dfrac{2\times10}{9.8}\)
\(t=\sqrt{\dfrac{2\times10}{9.8}}\)
\(t=1.4\ sec\)
We need to calculate the initial velocity
Using formula of velocity
\(v=\dfrac{d}{t}\)
Put the value into the formula
\(v=\dfrac{15}{1.4}\)
\(v=10.7\ m/s\)
Hence, The time is 1.4 sec
The initial velocity is 10.7 m/s.
In a 42 s interval, 597 hailstones strike a glass window of area 0.597 m2 at an angle 50◦ to the window surface. Each hailstone has a mass of 6 g and speed of 6.3 m/s. If the collisions are elastic, find the average force on the window.
Answer in units of N.
I need a short answer ?
Answer:
Explanation:
7a) t = d/v = 100/45cos14.5 = 2.29533...= 2.30 s
7b) h = ½(9.81)(2.29533/2)² = 6.46056... = 6.45 m
or
h = (45sin14.5)² / (2(9.81)) = 6.47 m
which rounds to the same 6.5 m when limiting to the two significant digits of the initial velocity.
An Olympian lifts a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
The force of gravity equals 9.8 m/s. What is the potential energy of the weights?
Answer:
PE = MGH. 1375 x 9.8 x 2. = 26950 joules
Explanation:
First do 1375 x 9.8 which is MG then times it by 2 which is H
Mass x Gravity x Height
the gravity will always be 9.8
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The the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
What is Potential energy?The energy of a body by virtue of its position is called potential energy. Mathematically -
E[P] = mgh
Given is an Olympian who lifted a 1,375-kilogram set of weights a vertical distance of 2 meters in the weightlifting event.
We can write the given data as follows -
Mass of weights = [M] = 1375 Kg
Displacement = [h] = 2 meters
Therefore, using the formula for potential energy, we can write -
E[P] = mgh
E[P] = 1375 x 9.8 x 2
E[P] = 26950 joules
Therefore, the the potential energy of the weights lifted 2 meters above the surface is E[P] = 26950 joules.
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If you connect two identical storage batteries together in series (" " to "-"), and place them in a circuit, the combination will provide Enter
1 for A) , 2 for B) , 3 for C) , 4 for D) , 5 for E)
A) the same voltage and the same current will flow through each.
B) twice the voltage, and different currents will flow through each.
C) the same voltage, and different currents will flow through each.
D) twice the voltage, and the same current will flow through each.
Answer:
4 (D): twice the voltage, and the same current will flow through each.
Explanation:
When we have batteries in series in a circuit, the equivalent voltage will be the sum of their voltages, and the current flowing through then will be the same.
These batteries are identical, so they have the same voltage, therefore when they are put in series, the equivalent voltage will be twice the voltage of one battery.
So the correct option is 4 (D): twice the voltage, and the same current will flow through each.
Which elements from the list below would you expect to have similar properties to sodium? Select all that apply.
Answer:
the third one
Explanation:
Answer:
Beryllium and Calcium
Explanation:
A police radar's effective range is 0.90 km , and your radar detector's range is 1.9 km . You're going 110 km/h in a 70 km/h zone when the radar detector beeps. At what rate must you negatively accelerate to avoid a speeding ticket?
Negative acceleration of 0.2 m/s^2 is needed to avoid a speeding ticket.
Negative acceleration occurs when a force causes a body's velocity to decrease. Positive acceleration occurs when the speed of something rises.
The acceleration of a slowing object is in the direction opposite from the velocity. As a result, this item is said to have negative acceleration.
Given:
Initial velocity, u = 110km/h
Final velocity, v = 70km/h
Police radar's effective range, S1 = 0.90km
Radar detector's range, S2 = 1.9km
To find:
Negative acceleration, a = ?
Formula:
v^2 = u^2 + 2aS
Calculation:
a = (v^2 – u^2) / 2(S1 - S2)
a = 70^2 – 110^2/ 2 x (0.9 – 1.9)
a = [(4900 – 12100) / (2 x -1)] / 3600^2
a = 0.2 m/s^2
Result:
0.2m/s^2 negative acceleration is required to avoid a speeding ticket.
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The size, shape, and color of an object would be an example of a
O physical change
O physical property
O chemical change
chemical property
Answer:
physical change
Explanation:
its only changing things you see.
A cylinder of radius 1.34 cm and a spherical shell of radius 6.97 cm are rolling without slipping along the same floor. The two objects have the same mass. If they are to have the same total kinetic energy, what should the ratio of the cylinder's angular speed wcyl to the spherical shell's angular speed wshl be?
Answer:
Explanation:
Moment of inertial of a UNIFORM cylinder is ½mR²
Moment of inertial of a spherical shell is ⅔mR²
Total kinetic energy is
KE = ½mv² + ½Iω²
KE = ½m(Rω)² + ½Iω²
KE = ½mR²ω² + ½Iω²
for the cylinder
KE = ½mR²ω₁² + ½(½mR²)ω₁²
KE = ¾m0.0134²ω₁²
for the sphere
KE = ½mR²ω₂² + ½(⅔mR²)ω₂²
KE = ⅚m0.0697²ω₂²
as the KE and mass are the same
¾m0.0134²ω₁² = ⅚m0.0697²ω₂²
¾0.0134²ω₁² = ⅚0.0697²ω₂²
ω₁²/ω₂² = ⅚0.0697²/¾0.0134²
ω₁/ω₂ = 0.0697√⅚ / 0.0134√¾
ω₁/ω₂ = 5.48285455...
The __________ of exercise determines the health and fitness benefit of the exercise. A. frequency B. intensity C. time D. type Please select the best answer from the choices provided. A B C D
Answer:
c- Time
Explanation:
The time will tell depending on the person who is exercising, the rate of time, the workout time. & limits on weights....
Answer:
The guy above me is wrong the real answer is D
Explanation:
Across
2. Cotton is a____ material.
4. The materials which are difficult to compress are known as____
5. Iron,Cooper,aluminum is called___.
6. The materials through which objects can be seen, but not clearly are known as___.
8. shiny appearance is termed as___
Down
1.Opaque material which we got from trees____
3.water is a____liquid.
7.vinegar is___in water
Across
2. opaque
4. hard
5. metal(s)
6. translucent
8. luster
Down
1. wood
3. transparent
7. soluble?
Happy to help, have a great day! :)
4- What force must be applied to a surface area of 0.0025m , to create a pressure ol
200.000Pa?
Surviving a Large Deceleration On July 13, 1977, while on a test drive at Britain's Silverstone racetrack, the throttle on David Purley's car stuck wide open. The resulting crash subjected Purley to the greatest "g-force" ever survived by a human - he decelerated from 173 km/h to zero in a distance of only about 0.66 m.
Calculate the magnitude of the acceleration experienced by Purley (assuming it to be constant), and express your answer in units of the acceleration of gravity, g=9.81m/s2 .
The magnitude of the acceleration experienced by Purley is -1749.82 m/s²
How to convert 173 Km/h to m/sWe'll begin by converting 173 Km/h to m/s. This can be obtained as follow:
3.6 Km/h = 1 m/s
Therefore,
173 Km/h = (173 Km/h × 1 m/s) / 3.6 Km/h
173 Km/h = 48.06 m/s
How to determine the accelerationThe following data were obtained from the question:
Initial velocity (u) = 48.06 m/sFinal velocity (v) = 0 m/sDistance (s) = 0.66 mAcceleration (a) = ?The acceleration can be obtained as follow:
v² = u² + 2as
0² = 48.06² + (2 × a × 0.66)
0 = 2309.7636 + 1.32a
Collect like terms
1.32a = 0 - 2309.7636
1.32a = -2309.7636
Divide both sides by 1.32
a = -2309.7636 / 1.32
a = -1749.82 m/s²
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Which is an example of a non-contact force?
A. A woman pulls open a door.
B. A magnet pulls an item toward it.
C. A student pushes his chair in at his desk.
D. A rolling ball slows down from friction
! Will give brainliest if you help !
Answer:
B - magnet pulls an item toward it.
Explanation:
It's the answer trust bro
Answer:
B.
Explanation:
Because your not physically touching the item getting pulled towards the magnet. hope this helps
A warning buoy A warning buoy is observed to rise every 4.3 s as crests of waves pass by it.
(a) What is the period of these waves?is observed to rise every 4.3 s as crests of waves pass by it.
A warning buoy is observed to rise every 4.3 s as crests of waves pass by it. The period of these waves is (T) = 4.3s
What is period?The period defines the quantity or the required time to complete one single oscillation. It has a synonym called time period. It can be measured in Seconds.
How can we calculate the period?According to the question,
A warning buoy is observed to rise every 4.3 s as crests of waves pass by it.
According to the definition of time period, time between two consecutive peaks of the oscillation called the time period.
So, According to the question the period of these waves is (T) = 4.3s
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Lester plays middle linebacker for dices football team. During one play, he made the following movements. First, he back-pedaled in the southern direction for 2.6 meters
Answer:
Explanation:
missing info .....
A bar has a 20 N weight at one end, as shown in Figure 7.22. You have a weight of 15 N to hang somewhere on the bar so that the bar is in equilibrium. Where would you hang the 15 N weight on each of these bars? Consider the bar to have no mass.
The weight of 15N should be hung at a distance of 4/3 units from the fulcrum, on the opposite side of the bar to a weight of 20N.
The fulcrum is attained equilibrium when the principle of moments is equal to zero. The principle of momentum is defined as the body is said to be balanced when the clockwise movement about the point is equal to the anticlockwise movement about the same point.
When a weight of 15N is hung on the bar, it produces an anticlockwise movement with the same magnitude, opposes the clockwise moment produced by the weight of 20N on the fulcrum.
To find the distance (d) at which the 15N weight should be hung, the distance from the 20N weight to the fulcrum is 1 unit.
20×1 = 15×d
d = 20/15
=4/3 m
Thus, the weight of 15N should be hung by the distance of 4/3 units from the fulcrum, on the opposite side of the bar having the weight of 20N, to make the fulcrum to be at equilibrium.
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A 0.10 kg stone is thrown from the edge of an ocean cliff with an initial speed
of 20 m/s. When it strikes the water below, it is traveling at 45 m/s. What is the
change in the kinetic energy of the stone?
Answer:
79.20 joule
Explanation:
1.
A 0.10kg stone is thrown from the edge of an ocean cliff with an initial speed of 21m/s. When it strikes the water below, it is traveling at 45m/s. What is the change in kinetic energy of the stone?
ΔEk = m/2*(V2^2-V1^2) = 0.05*(45^2-21^2) = 79.20 joule
The change in the kinetic energy of the stone is 81.25 J.
The given parameters;
mass of the stone, m = 0.1 kginitial speed of stone, u = 20 m/sfinal velocity of the stone, v = 45 m/sThe initial kinetic energy of the stone is calculated as follows;
K.E = ¹/₂mu²
K.E₁ = ¹/₂ x 0.1 x 20²
K.E₁ = 20 J
The final kinetic energy of the stone is calculated as follows;
K.E₂ = ¹/₂ x 0.1 x 45²
K.E₂ = 101.25 J
The change in the kinetic energy of the stone is calculated as follows;
ΔK.E = K.E₂ - K.E₁
ΔK.E = 101.25 J - 20 J
ΔK.E = 81.25 J
Thus, the change in the kinetic energy of the stone is 81.25 J.
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Six identical elements are connected in a battery whose internal resistance is 6Ω. Resistors R₁=14Ω and R₂ are connected to the battery, the total resistance of the external circuit is R=7Ω and the current flowing in it is 4 A. Determine the resistance of the second resistor and the internal EDS of the elements .
Answer:
Using Ohm's Law, we can calculate the voltage of the battery as V = IR = (4 A)(7 Ω) = 28 V.
The total resistance of the circuit is R = R₁ + R₂ + r, where r is the internal resistance of each element.
We know that R₁ = 14 Ω and R = 7 Ω, so we can solve for R₂:
R₂ = R - R₁ = 7 Ω - 14 Ω = -7 Ω
This is a negative resistance, which doesn't make sense physically. However, it indicates that there is an error in the problem or the calculations.
To find the internal EDS of the elements, we can use the equation:
V = ε - Ir
where V is the voltage of the battery, ε is the internal EDS of each element, I is the current flowing in the circuit, and r is the internal resistance of each element.
We know that V = 28 V, I = 4 A, and r = 6 Ω, so we can solve for ε:
ε = V + Ir = 28 V + (4 A)(6 Ω) = 52 V
Therefore, the internal EDS of each element is 52 V.
Which phrase best completes the diagram?
Role of the Federal Reserve in the U.S. economy:
Sets interest rates➡️?➡️Loans money to other banks
A. Approves the federal budget.
B. Votes on coporate regulations.
C. Sets the consumer price index.
D. Makes rules for other banks.
Correct answer is:
D. Makes rules for other banks.
Answer:
B
Explanation:
i think
Answer:
D. makes rules for other banks
Explanation:
Identify three main ideas about models
Answer:
Approaches mathematical learning through inquiry
-Explore real contexts, problems, situations, and models
-Learning through doing shifts the focus on the students
-Problems have multiple entry and exit points
-Links to other disciplines
Explanation:
quizlet
how does mass relates to latent heat?
The mass of a substance is not directly related to latent heat. Instead, latent heat is a parameter that describes the amount of energy required or released during a phase shift of a substance.
What is latent heat?Latent heat can be thought of as hidden energy that is supplied or extracted to change the state of a substance without changing its temperature or pressure.
Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process—typically a first-order phase transition.
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Select the correct answer.
What is the force that can cause two pieces of iron to attract each other?
A.
gravitational force
B.
magnetic force
C.
elastic force
D.
electrostatic force
Answer:
A. gravitational force always true.
B, C and D could be true under the correct conditions
person a and b traveling away from each other. It takes person a 2 hours to travel a full circle, and person b 5 hours to travel a full circle. how much time will it take for a and b to meet?
Let the circumference of the circle be 10L.
A moves at 10L/2 = 5L per hour
B moves at 10L/5 = 2L per hour
Therefore it takes 10L/(5L+2L) = 10/7 hours