Answer: 0
Explanation:
Given
Shaneil hold the 20 N box for 40 s
Since there is no movement of the box, so velocity associated with it is zero and the workdone by the shaniel is also zero.
Power is the rate of doing work. Therefore, it is also zero.
What is the voltage in an electric current?
a. The power of the electrons
b. The charge of the electrons
c. The energy of the electrons
is the Matter is made up of motionless particles.
Answer:
All matter is made up of atoms.
give 10 situation in which you push or pull to change the state of motion of abject
Explanation:
Hope ir helpful
brainliest me please
A ball moving with an initial velocity of 5 m/s comes to rest after 2s. What was the ball's acceleration?
Answer:
-2.5m/s²
Explanation:
The acceleration of a body is giving by the rate of change of the body's velocity. It is given by
a = Δv / t ----------------(i)
Where;
a = acceleration (measured in m/s²)
Δv = change in velocity = final velocity - initial velocity (measure in m/s)
t = time taken for the change (measured in seconds(s))
From the question;
i. initial velocity = 5m/s
final velocity = 0 [since the body (ball) comes to rest]
Δv = 0 - 5 = -5m/s
ii. time taken = t = 2s
Substitute these values into equation (i) as follows;
a = (-5m/s) / (2s)
a = -2.5m/s²
Therefore, the acceleration of the ball is -2.5m/s²
NB: The negative sign shows that the ball was actually decelerating.
Can someone help me find the which direction is north and which is south on this solenoid?
Explanation:
Now, looking down the solenoid tube determine what direction is the winding. If clockwise in relation to the positive wire then is the south pole, if anti-clockwise then is the north pole. So, to summarize the magnetic south pole is always clockwise in relation to the positive wire.
what is the full name of the units used for frequency?
How many dots belong in the electron dot diagram of a boron (B) atom?
three
five
eight
thirteen. pls let me know I have been working on this for 9 hours
The answer is five dots.
sorry i meant three dots not five
4. Why is the temperature constant during the boiling of water?
Answer:
When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. These rise to the surface and enter the atmosphere. It requires energy to change from a liquid to a gas. In addition, gas molecules leaving the liquid remove thermal energy from the liquid. Therefore the temperature of the liquid remains constant during boiling.
Look at the diagrams. Each model the arrangement of particles in a substance.
Which diagram is the best model for a solid?
Substance A
Substance B
Substance C
Answer:
a
Explanation:
because it has compact molecules
People move into and begin living in an area that previously
had no human activity. What will most likely be the effect on
the amount of water?
A Water will be more evenly distributed in the area
B Most of the fresh water in the area will be converted to
salt water
C The amount of fresh water suitable for drinking will
increase
D There will be less available for other living things
Group of answer choices
c
D) There will be less available for other living things.
There will be less available for other living things is the most likely effect on the amount of water and is denoted as option D.
What is Water?
This is a compound which is regarded as a universal solvent and can be found in rivers, streams etc.
People moving into and living in the area means water will be used which will make it less available for other living things.
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If the current in the circuit is 10.5 A,
what is the potential difference across the
source?
(AI 0.750 V
(B) 9.19 V
(C) 12.0 V
(D) 49.0 V
(E) 147 V
Answer:
E) 147 V
Explanation:
Ra+Rb+Rc = 14.0
V = IR
V = (10.5)(14.0)
V = 147 V
The potential difference across the source will be c)12V
What is Ohm's law ?Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points .
since , R(A) , R(B) AND R(C) are in parallel combination , hence equivalent
resistance of the circuit will be
1/R = 1/R(A) + 1/ R(B) + 1/ R(C)
1/R= 1/2 + 1/4 +1/8
1/R = 7/8
R = 8/7 ohm
from ohm's law
Voltage = current * resistance
V( source ) = current (in circuit ) * R (equivalent resistance)
V = 10.5 * (8/7)
V = 12 V
The potential difference across the source will be c) 12V
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the unit of area is derived unit why
Which is the strongest of the four fundamental forces? strong nuclear, weak nuclear, electromagnetic, gravitational
Answer:
Hands down, the strong nuclear force.
Answer:
strong nuclear force, hope it helps!
Explanation:
Actually, gravity is the weakest of the four fundamental forces. Ordered from strongest to weakest, the forces are 1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity.
source: https://wtamu.edu/~cbaird/sq/2013/05/22/why-is-gravity-the-strongest-force/
Of the following, which is a renewable energy resource?
a.
coal
c.
geothermal energy
b.
kerosene
d.
natural gas
Please select the best answer from the choices provided
A
B
C
D
coal or natural gas i think
In a launch speed formula vx = d over t, vx is acceleration, d is distance, and t is time.
Answer:
V of x is the velocity on the x graph so it is false
Hope it helps
Answer: False
Explanation:
Vx can't be acceleration because acceleration is velocity over time not distance over time (the equation for speed)
50.0 meters away from a building. Tip of the building makes an angle of 63.0° with the horizontal. What is the height of the building
Answer:
98.13m
Explanation:
Complete question
Daniel is 50.0 meters away from a building. Tip of the building makes an angle of 63.0° with the horizontal. What is the height of the building
CHECK THE ATTACHMENT
From the figure, using trigonometry
Tan(θ ) = opposite/adjacent
Where Angle (θ )= 63°
Opposite= X = height of the building
Adjacent= 50 m
Then substitute the values we have
Tan(63)= X/50
1.9626= X/50
X= 1.9626 × 50
X= 98.13m
Hence, the height of the building is 98.13m
When animals such as fox, deer and bears eat fruits from plants, the seeds are typically completely digested. True False
Answer:
False.
Explanation:
The plants rely on animals to spread their seeds, thats why they make fruits so the animals eat em, the seeds are strong enough to survive the animals stomach and come out the other end.
6. According to Ohm's Law, current (I), voltage (V), and resistance (R)
are related as V=IR. What is the slope of the graph shown below? (5F)
+R
a.
b.
-R
C
1
+
R
1
d.
R
Voltage
Current
Answer: C
Explanation: according to the law voltages = to current and resistance
Para investigar - Posición del cuerpo en general. - Posición de la cabeza. - Posición de los brazos y manos. - Apoyo de los pies. - Como deben ser los movimientos.
Answer:
Algunos se mueven en dos direcciones y algunos se mueven en las cuatro direcciones.
Explicación:
Para investigar la posición del cuerpo en general, la posición de la cabeza, la posición de los brazos y manos y los pies tienen algunos movimientos específicos. Algunos se mueven hacia arriba y hacia abajo significa en dos direcciones mientras que el otro se mueve en todas las direcciones. Los brazos se mueven solo hacia adelante y hacia atrás, mientras que, por otro lado, los pies, la mano y la cabeza se mueven hacia la izquierda, la derecha y hacia arriba y hacia abajo.
6.There are four mixtures A, B, C and D. The mixture A contains sand and sugar, mixture B contain chalk powder and salt, mixture C contains salt and sugar, whereas mixture D contains sugar and charcoal powder. Which one of these mixtures cannot be separated by using water as a solvent? Why?
Answer:
Mixture C (salt and sugar)
Explanation:
Both salt and sugar can dissolve in water. And you can't just separate the mixture by filtering it like you could in the other mixtures.
Which of the following is a scientific question?
A. What is the best price for an LED screen design?
B. Which LED screen design produces the most attractive images?
C. Which LED screen design is the most energy efficient?
D. Does the LED screen design violate a previous patent?
Answer:
I think the answer would be c
Explanation:
A. is not scientific
B. is subjective, so it can't be scientific.
C. can be studied with an experiment
D. relates to regulations, not science
A car begins at rest (0 velocity), 5 seconds later it is travelling at 20 meters/per second. What was the acceleration of the vehicle during these 5 seconds
Please help ASAP
use the formula
v= u+ at
v is final velocity , u is initial velocity , a is acceleration and t is time
put the values
20 = 0+ a×5
a = 4 m/s²
Answer:
Initial velocity(u)=0
Final velocity(v) =20 meters/ second
Time(t)=5
Acceleration (a)=?
a=v-u/t
a=20-0/5
a=20/5
a=4meters/second
Question:
A race car slows with an average acceleration of –8.0 m/s2 (negative sign shows deceleration). The car’s initial velocity is 100.0 m/s, how far does it travel in 12.0 seconds? Explain how you arrived at your answer?
Use the equations
Answer:
[tex]624\:\mathrm{m}[/tex]
Explanation:
We can use kinematics equation [tex]\Delta x =v_it+\frac{1}{2}at^2[/tex].
What we're given:
[tex]v_i[/tex] of 100.0 m/s[tex]t[/tex] of 12 s[tex]a[/tex] of -8.0 [tex]\mathrm{m/s^2}[/tex]Solving for [tex]\Delta x[/tex]:
[tex]\Delta x=100\cdot 12+\frac{1}{2}\cdot -8\cdot 12^2=\boxed{624\:\mathrm{m}}[/tex]
Circular Motion A 650-kg car moving at 8.5 m/s takes a turn around a circle with a radius of 48.0 m. Determine the acceleration acting upon the car. Use a = v2/ r
Answer:
Explanation:
The mass of the car doesn't matter because On a flat curve the mass of the car does not affect the speed at which it can stay on the curve. You would need the mass if you were solving the the centripetal force acting on the car, but not the acceleration.
[tex]a=\frac{v^2}{r}[/tex] and filling in
[tex]a=\frac{(8.5)^2}{48.0}[/tex] and we need 2 significant digits in our answer. That means that
a = 1.5 m/sec²
A scholar climbs up 8 m of stairs while using 500 J of work in 10 seconds.
What is their power?
Answer:
according to the new geometry lesson alcometry which will after 11 years in geometry
A hydrometer is made of a tube of diameter 2.3cm.The mass of the tube and it's content is 80g. If it floats in a liquid density 800kg|m, calculate the depth to whc it sinks
Answer:
The depth to which the hydrometer sinks is approximately 24.07 cm
Explanation:
The given parameters are;
The diameter of the hydrometer tube, d = 2.3 cm
The mass of the content of the tube, m = 80 g
The density of the liquid in which the tube floats, ρ = 800 kg/m³
By Archimedes' principle, the up thrust (buoyancy) force acting on the hydrometer = The weight of the displaced liquid
When the hydrometer floats, the up-thrust is equal to the weight of the hydrometer which by Archimedes' principle, is equal to the weight of the volume of the liquid displaced by the hydrometer
Therefore;
The weight of the liquid displaced = The weight of the hydrometer, W = m·g
Where;
g = The acceleration due to gravity ≈ 9.81 m/s²
∴ W = 80 g × g
The volume of the liquid that has a mass of 80 g (0.08 kg), V = m/ρ
V = 0.08 kg/(800 kg/m³) = 0.0001 m³ = 0.0001 m³ × 1 × 10⁶ cm³/m³ = 100 cm³
The volume of the liquid displaced = 100 cm³ = The volume of the hydrometer submerged, [tex]V_h[/tex]
[tex]V_h[/tex] = A × h
Where;
A = The cross-sectional area of the tube = π·d²/4
h = The depth to which the hydrometer sinks
h = [tex]V_h[/tex]/A
∴ h = 100 cm³/( π × 2.3²/4 cm²) ≈ 24.07 cm
The depth to which the tube sinks, h ≈ 24.07 cm.
A 51-g rubber ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms.
The ball rebounds elastically and returns to its original height. The time interval for the round trip is 3.00 s. What is the magnitude of the
average force that the plate exerted on the ball?
2490 N
1500 N
2000 N
3500 N
3000 N
Answer:
F = 3000 N
Explanation:
Let's use the relationship between momentum and momentum
I = Δp
F t = m v_f - m v₀
As the body when bouncing reaches the same height from which it begins to fall, the modulus of speed is the same, but in the opposite direction,
v_f = - v₀ = v
F t = m 2v
F = 2 m v / t (1)
This is the contact time t = 0.5 ms = 0.5 10⁻³ s
Let's use the kinematics to find the velocity at the point of touching the plate, as the total travel time is 3.0 s, the descent time must be half the total time
t = 1.5 s
as the body solved its initial velocity is zero
v = v₀ + g t
v = g t
v = 9.8 1.5
v = 14.7 m / s
we substitute in equation 1
F = 2 0.051 14.7 / 0.5 10-3
F = 2,999 103 N
F = 3000 N
The average force that the plate exerted on the ball is 3,000 N.
The given parameters;
mass of the rubber ball, m = 51 g = 0.051 kgtime in contact, t = 0.5 mstime interval for rebound, Δt = 3 sThe velocity of the ball is calculated as follows;
[tex]v = g\Delta t\\\\v = 9.8 \times 3\\\\v = 29.4 \ m/s[/tex]
The average force that the plate exerted on the ball is calculated as follows;
[tex]F = \frac{mv}{t} \\\\F = \frac{0.051 \times 29.4}{0.5 \times 10^{-3} } \\\\F = 3,000 \ N[/tex]
Thus, the average force that the plate exerted on the ball is 3,000 N.
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In an experiment to measure the specific heat capacity of copper, 0.02 kg of water at 70°C is poured into a copper calorimeter (with a stirrer) of mass 0.16 kg at 15°C. After stirring, the final temperature is found to be 45°C. If the specific heat of water is 4,200 J/kg/°C,
[tex] \orange{\underline{\huge{\bold{\textit{\green{\bf{QUESTIONS}}}}}}} [/tex]
In an experiment to measure the specific heat capacity of copper, 0.02 kg of water at 70°C is poured into a copper calorimeter (with a stirrer) of mass 0.16 kg at 15°C. After stirring, the final temperature is found to be 45°C. If the specific heat of water is 4,200 J/kg/°C,
[tex] \blue{\huge{\red{\boxed{\green{\mathfrak{GIVEN}}}}}} [/tex]
WATER:-
Mass :- 0.02 kg at 70°C
Specific Heat Of Water is 4,200 J/kg°C,
COPPER:-
MASS:- mass 0.16 kg at 15°C
Temperatures r according to the part !
[tex]{\huge{\huge{\bold{\green{To \: Find :- }}}}}[/tex]
what is the quantity of heat released per kg of water per 1°C fall in temperature?
Calculate the heat energy released by water in the experiment in cooling from 70°C to 45°C.
Assuming that the heat released by water is entirely used to raise the temperature of calorimeter from 15°C to 45°C) calculate the specific heat capacity of copper.
[tex] \huge\red{\boxed{\huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}}}[/tex]
[tex]{\blue{\star{\red{Part \: 1 :- What \: is \: the \: quantity \: of heat \: released \: per \: kg \: of \: w ater \: per \: 1°C \: fall \: in \: temperature }}}}[/tex]
[tex]\orange{Specific \: \: Heat}[/tex]
It is the amount of the heat released by unit mass of the body per 1°C fall in temperature.
It is the amount of the heat absorbed by the unit mass of the body per 1°C rise in temperature
So quantity of heat released per kg of water per 1°C fall in temperature is equal to the specific heat of the water which is 4,200 J/kg°C,
[tex]{\red{\star{\blue{Part \:2 :-\: Calculate \: the \: heat \: energy \: released \: by \: water \: in \: the \: experiment \: in \: cooling \: from \: 70°C \: to \: 45°C. }}}}[/tex]
MASS OF WATER --> 0.02 kg
INITIAL TEMPERATURE--> 70°C
FINAL TEMPERATURE--> 45°C
CHANGE IN TEMPERATURE--> (45-70)°C =(- 25)°C
SPECIFIC HEAT OF WATER--> 4200 J/ kg °C
[tex]Q = mc\triangle T \\ \\ Q = 0.02 \times 4200 \times ( -25) \\ \frac{2}{100} \times 4200 \times( - 25) =Q \\ ( - 50) \times 42 = Q \\ Q = ( - 2100) \: joules[/tex]
NEGATIVE INDICATES THAT HEAT IS RELEASED BY THE BODY!
IT MEANS COOLING HAS BEEN TAKEN PLACED.
[tex]{\red{\star{\green{Part \:2 :-\:Assuming \: that \: the \: heat \: released \: by \: water}}}} \\ \\ {\green{is \: entirely \: used \: to \: raise \: the temp \: of \: calorimeter \: from \: 15°C \: to \: 45°C }} \\ \\{\green{ calculate \: the \: specific \: heat \: capacity \: of \: copper.}}[/tex]
MASS OF COPPER :- 0.16 kg
INITIAL TEMPERATURE:- 15°C
FINAL TEMPERATURE:- 45°C
CHANGE IN TEMPERATURE--> (45-15)°C = 30°C
AMOUNT OF HEAT RELEASED BY WATER --> 2100 J ( From second part)
[tex]Q = mc\triangle T \\ \\ 2100 = 0.16 \times c \times 30 \\ 70 = 0.16 \times c \\ \\ c = \frac{7000}{16} \\ c = 437.5 \: \frac{J }{kg°C} [/tex]
The heat energy released by water in the experiment in cooling from 70°C to 45°C is 2100 joule.
The specific heat of copper is 437.5 J/kg/°C.
What is specific heat?The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as its specific heat. Calories or joules per gram per degree Celsius are used as the units of specific heat.
The heat energy released by water in the experiment in cooling from 70°C to 45°C is =
Mass of water × specific heat of water × Change is temperature
= 0.02 kg × 4,200 J/kg/°C × (70°C - 45°C)
= 2100 joule.
This energy is absorbed by the copper calorimeter (with a stirrer).
Hence, specific heat of copper is = energy absorbed/ ( mass of copper calorimeter (with a stirrer) × Change in temperature)
= 2100 joule ÷ { 0.16 × ( 45°C - 15°C)} J/kg/°C
= 437.5 J/kg/°C.
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Your question is incomplete, but most probably the question was:
In an experiment to measure the specific heat capacity of copper, 0.02 kg of water at 70°C is poured into a copper calorimeter (with a stirrer) of mass 0.16 kg at 15°C. After stirring, the final temperature is found to be 45°C. If the specific heat of water is 4,200 J/kg/°C,
calculate the heat energy released by water in the experiment in cooling from 70°C to 45°C.
calculate specific heat of copper.
A mountain climber increases their height from 200 meters to 400 meters. What affect will this have on their potential energy?
Answer:
At 400 m the potential energy of the mountain climber doubled the initial value.
Explanation:
Given;
initial height of the mountain climber = 200 m
final height of the mountain climber, = 400 m
The potential energy of the mountain climber is calculated as;
Potential energy, P.E = mgh
At 200 m, P.E₁ = mg x 200 = 200mg
At 400 m, P.E₂ = mg x 400 = 400mg
Then, at 400 m, P.E₂ = 2 x 200mg = 2 x P.E₁
Therefore, at 400 m the potential energy of the mountain climber doubled the initial value.
A book is dropped from a window. It takes 5 seconds to reach the ground. What is its velocity after 2 seconds? What’s the velocity at the time when it hits the ground?
Answer:
Explanation:
Initial velocity is 0. In the equation v = v0+at where v0 is the initial velocity of 0, we only have to fill in -9.8 for a and 2 for t to get the velocity after 2 seconds -19.6 m/s; after 5 seconds, when it hits the ground, a = -9.8 and t = 5 to give a velocity of -49 m/s. Gravity pulls down everything at the same rate, it doesn't matter whether we drop a feather or an elephant from the window!