Answer:
60
Explanation:
90+30=120:2=60km/h
Please hurry and help ASAP
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!
does the speedometer of a car read average speed or instantaneous speed? and how do we know?
Answer:
The speedometer of a car shows its instantaneous speed (as we understand it) and not the average speed. Technically, instantaneous speed is also average speed, but calculated over a very, very small time period. Speed is nothing but a ratio of distance traveled and time taken.
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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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.
answer the question quick
Answer:
no it will not glow hope help you stay happy
what is the full name of the units used for frequency?
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.
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
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
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
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]
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
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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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.
should the size of the test charge compare to the amount of charge that produces the field
Answer:
20000000000)0000000000000
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
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.
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
Which of the following is true concerning hurricanes?
a. They tend to deposit more sediment than they remove.
b. Their storm surges cause widespread flooding.
c. They have fast, but generally weak wind gusts.
d. They do not alter landscapes significantly.
Answer:
B.
Explanation:
B. is correct because every time usually when a hurricane hits it causes flooding causing multiple homes to be ruined. It is a known fact that usually hurricanes start close or in along with tornadoes, the water, meaning once they hit land they have some water to flood that land with.
C. is absolutely false hurricanes have VERY strong wind gusts.
D. is absolutely wrong they do alter landscapes by ripping trees and plants and houses out of the ground making the landscapes look different.
A. is wrong they tend to deposit and remove sediment evenly.
~ LadyBrain
Answer:
B
Explanation:
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
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.
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)
The base for hair follicles is in the _____.
epidermis
fatty layer
dermis
dentin
Answer:
dermis
Explanation:
epidermis
dermis
hypodermis
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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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.
8892 ml to grams then to mg
Answer:
8892 ml = 8892 gm = 8892000 mg
1 ml = 1 gram
8892 ml = 8892 gram
1 gram or ml = 1000 milligram
8892 ml = 8892 × 1000 = 8892000 milligram
hope this helps
have a good day :)
Explanation:
remember: 1 kilogram = 1000 gram = 1000000 milligram.
Milliliter is expressed same as gram and liter is expressed same as kilogram.
1 meter = 100 cm, 1 kilometer = 1000 meter,
1 cm = 10 millimeter.
You can't convert ml to gm unless you know the substance. They're all different.
If u walk to school at a speed of 1.2 m/s and it takes you 18 min to reach the school, what is the distance from your home to the school?
Answer:
21.6m
Explanation:
Distance=speed×time
=1.2m/s×18min
=21.6m
Hope this helps u
Answer:
Explanation:
1 minute = 60 seconds
18 minutes = 18 * 60 sec = 1080 seconds
1 second allows 1.2 meters of a step
1080 second = x
1 / 1080 = 1.2 / x Cross multiply
x = 1.2 * 1080
x = 1296 meters
I live 1296 meters from the school.
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