Answer
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Answer:
a ecology
Explanation
L nathaliedog
1. A liquid of mass 250g is heated with an electric heater. Its temperature rises from 30°C to 80°C, the specific heat capacity of the liquid is 2000J/kg°C and the power rating of the heater is 500W. For how long was the heater used?
2. A solid metal of mass 2kg is heated using a heater of power 2kW for 5 minutes. Its final temperature becomes 400°C. Find the initial temperature of the metal. Specific heat capacity of the metal=1J/g°C.
Answer:
1) 50 seconds 2) 100°C
Explanation:
(Follows formula of Power=Energy/Time)
1) 500W x X = 2000J/kg°C x .25kg x 50°C
X = 50 seconds.
2) 2000W x 300s = 1000J/kg°C x 2kg x X
X = 300
Initial temperature => 400°C-300°C = 100°C
PLEASE HELP!! ILL MARK BRAINLYEST!!!
The process of a neutron splitting a nucleus into two parts is called _____.
A. fission
B. atomic
C. fusion
Will the velocity of a book change as it moves across the surface with friction
Friction force is a force that opposes relative motion of two bodies that have contacting surfaces
Yes, the velocity of the book will change as it moves across the surface with friction
Reason:
According to Newton's first law of motion, a body will remain at rest or move with a constant speed in a straight line unless acted on by a force
Friction force, f = Normal reaction, N × Coefficient of friction, μ
A surface with friction has frictional force that opposes the relative motion of an object in surface contact across it
When an object such as a book moves across a surface with friction, the friction force acts on the book having a velocity, opposing the motion of the book, therefore, slowing down the book
Therefore, the velocity of the will change (reduce) as it moves across the surface with friction
Learn more about friction here:
https://brainly.com/question/1021839
Each large pizza can feed three teenage boys. How many pizzas would be needed to feed the
football team? (56 teenage boys).
Answer:
19 pizzas
Explanation:
1 pizza = 3 boys
=> 56 ÷ 3 = 18.666666666666.. or about 19 pizzas
Imagine that a car is traveling from your left to your right at a constant velocity. Which two actions could the driver take that may be represented as (a) a velocity vector and an acceleration vector both pointing to the right and then (b) changing so the velocity vector points to the right and the acceleration vector points to the left?
Answer:
(a). The speed of car will increases.
(b). The speed of car will decreases.
Explanation:
Given that,
A car is traveling from your left to your right at a constant velocity.
We need to find two actions could the driver take
Using given data
(a). If the velocity and acceleration of car to the right
It means the velocity and acceleration of car is in same direction then the speed of car will increases.
(b). If the velocity to the right and the acceleration to the left
It means the velocity and acceleration of car is in opposite direction then the speed of car will decreases.
Hence, (a). The speed of car will increases.
(b). The speed of car will decreases.
can someone please help asap!!! tysm
the answer is 0m/s२.
Explanation:
Because when the object is changing position at a constant velocity,the acceleration is 0m/s२.
I hope it'll help u.
Suppose Person A runs off the edge of the cliff at 2 m/s and Person B runs off the edge at 1 m/s. Which will hit the ground farther from the base of the cliff?
Answer:
Person A will hit a distance fatherExplanation:
Based on the fact that the velocity of person A is more than that of person B, that is from the question, person A has a velocity of 2m/s and person B has a velocity of 1m/s, this clearly shows that person A has the tendency to hit a distance farther from the cliff than person B.
What is the acceleration of an object with a 4500 g mass when there is a net force of 18 N on it?
Suppose the polar bear was running on land instead of swimming. If the polar bear runs at a speed of about 8.3 m/s, how far will it travel in 10.0 hours?
Answer:
298800 m
Explanation:
[tex]v = \frac{d}{t} [/tex]
V=speed
d=distance
t=time
[tex]d = vt[/tex]
Change hours to seconds
It will be 36000s
8.3m/s * 36000s
=298800m
What is the amount of displacement of a runner who runs exactly 2 laps around a 400 meter track?
At the end of the laps, the runner's displacement is zero.
You pull two blocks connected by a lightweight string across a horizontal table. Block 1 has a mass of 1.00 kg, and block 2 has a mass of 2.00 kg. There is negligible friction between the blocks and the table. The string will break if the tension is greater than 6.00 N. What is the maximum pull that you can apply to block 1 without breaking the string?
Which planet has a density that is less than the density of liquid water?
You use an inclined plane to move furniture into a truck.
You perform 224 kJ of work, but only do 91 kJ of useful
work. What is the efficiency of the inclined plane?
A. 12.8%
B. 40.6%
C. 68.2%
D. 246.1%
Answer:B. 40.6%
Explanation:
What is named as improper or wicked projects? Why would these ideas be improper or wicked?
(Federalist Paper No. 10)
Answer:
Faction
Explanation:
I am not sure by the paper is written by James Madison who opposes republican government
Which sentence describes Newton's first law?
Answer:
Options?
Explanation:
Answer:
Unbalanced forces cause in object to move. (apex)
Explanation:
dont skip need help ASAP and pls hurry will give 10 pts + brainliest
Which quality should an experiment have to be replicable and valid?
a.) clearly detailed results
b.) a well-cited research paper
c.) several tested variables
d.) trials conducted in a laboratory
Answer:
C
Explanation:
In order for an experiment to be valid need to be conducted with several tested variables
Answer:
It's A
Explanation:
It makes sense ( please mark me brainliest)
An object was placed in 50 ml of water. When the object was then measured in the water. The new volume of the water with the object was 86 ml. What is the volume of the object?
Answer:
36 ml
Explanation:
The volume of the water was 50 ml without anything in it. When you put something in water, the amount of volume that it rises is the volume of the object put into it. It rose up to 86 ml.
86-50=36
36 ml
Why isn’t it possible to measure the thermal energy of a substance using a thermometer
Answer:
This is because a thermometer is only meant for measuring temperature and temperature is not a measure of thermal energy
Explanation:
The reason is because a thermometer is designed and calibrated to measure the temperature of a body.
Although the thermal energy of a body is somehow related to its temperature, the thermal energy of a body is not entirely dependent on the temperature of the body
The thermal energy of a body deals with its heat. While thermal energy basically deals with the amount of heat, temperature deals with the flow from one point to another along the body
So what this means is that since thermometer measures this flow, it cannot be used to ascertain the level of heat ( thermal energy) in the body
Answer:
This is because a thermometer is only meant for measuring temperature and temperature is not a measure of thermal energy
Explanation:
Who here has a dream to one day become something great?
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Which best describes a material that could be used as a pan for baking cakes?
A. good conductor of cold
B. poor conductor of cold
O C. good conductor of heat
D. poor conductor of heat
Answer:
C
Explanation:
just wanna make sure im right
Biodiesel is a type of fuel that can be made from animal fat. During production, animal fats and alcohol chemically react to produce fuel. Biodiesel may be used as an energy source in vehicles. Which conclusion is best supported by the information? Biodiesel is not considered a renewable energy source because it is used in vehicles. Biodiesel is considered a renewable energy source because it is used in vehicles. Biodiesel is not considered a renewable energy source because it is made with animal fat. Biodiesel is considered a renewable energy source because it is made with animal fat.
Answer:
Biodiesel is considered a renewable energy source because it is made with animal fat
Explanation:
Biodiesel is a fuel generated from animal fats, vegetable fats, using a catalyst for chemical formulation of biodisel.
It is a renewable source of fuel, as it can be replenished (renewed) easily & in shorter time, since it is made of animal fats & vegetable fats. Unlike non renewable fuels which take long periods to replenish (renew), like fossil fuels.
So, Biodiesel is considered a renewable energy source because it is made with animal fat
Answer: D
Explanation: Took the test
SP1a.
What is the average velocity of a car that travels 30 kilometers due west in 0.50 hour?
Answer:
16.67 m/s
Explanation:
[tex]v = \frac{d}{t} [/tex]
Change kilometers to meters and hour to seconds
=30000m/1800s
=16.67 m/s
which has more inertia, a textbook or calculator
The light rays in the illustration below do not properly focus at the focal point. This problem occurs with
A. all-spherical mirrors
B. all parabolic mirrors
C. only defective spherical mirrors
D. only defective parabolic mirrors
This problem occurs with C. only defective spherical mirrors.
Spherical mirrors can be either concave or convex, depending on their shape. A perfect spherical mirror is one that has a consistent curvature across its surface, which allows all the light rays that strike it to properly converge or diverge and focus at the focal point.
However, a defective spherical mirror is one that does not have a perfect curvature across its surface. This can happen due to manufacturing errors or damage to the mirror. When a spherical mirror is defective, the light rays do not properly focus at the focal point, leading to distorted or blurred images.
On the other hand, parabolic mirrors have a unique shape that allows them to reflect incoming light rays to a single focal point, providing a sharper and clearer image compared to spherical mirrors.
Therefore, the correct answer is C. only defective spherical mirrors, as they are the ones that do not properly focus the light rays at the focal point.
To learn more about spherical mirrors, here
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Thermal energy is the __________ of the particles in a material.
Potential energy
Total energy
Temperature
Average kinetic energy
A medical cyclotron used in the production of medical isotopes accelerates protons to 6.5 MeV . The magnetic field in the cyclotron is 1.4 T . Part A What is the diameter of the largest orbit, just before the protons exit the cyclotron? Express your answer with the appropriate units. d d = nothing nothing SubmitRequest Answer Part B A proton exits the cyclotron 1.0 ms after starting its spiral trajectory in the center of the cyclotron. How many orbits does the proton complete during this 1.0 ms ? N N = nothing orbits SubmitRequest Answer Provide Feedback Next
Answer:
a
The largest diameter is [tex]d = 0.523 \ m [/tex]
b
The number of revolution is [tex]n = 2.132 *10^{4}[/tex]
Explanation:
From the question we are told that
The kinetic energy of the electron is [tex]K = 6.5 MeV = 6.5 *10^6 * 1.60 *10^{-19} = 1.04 *10^{-12} \ J[/tex]
The magnetic field is [tex]B = 1.4 \ T[/tex]
The time is [tex]t = 1 ms = 1*0^{-3} \ s[/tex]
Generally the kinetic energy of the proton is mathematically represented as
[tex]KE = \frac{1}{2} * m * v^2[/tex]
Here m is the mass of the proton with a value [tex]m = 1.672 *10^{-27} \ kg[/tex]
=> [tex]v = \sqrt{ \frac{2 * K }{ m} }[/tex]
=> [tex]v = \sqrt{ \frac{2 * 1.04 *10^{-12} }{ 1.672 *10^{-27}} }[/tex]
=> [tex]v = 3.5271 * 10^{7} \ m/s [/tex]
Generally the radius of the largest orbit is mathematically represented as
[tex]r = \frac{ m * v}{ B * e}[/tex]
Here e is the charge on a proton with the value [tex]e = 1.60 *10^{-19} \ C[/tex]
[tex]r = \frac{ 1.672 *10^{-27} * 3.5271 * 10^{7} }{ 1.4 * 1.60 *10^{-19} }[/tex]
=> [tex]r = 0.261 \ m [/tex]
Generally the diameter is
[tex]d = 2 * r[/tex]
=> [tex]d = 2 * 0.261[/tex]
=> [tex]d = 0.523 \ m [/tex]
Gnerally the period of revolution round the orbit is mathematically represented as
[tex]T = \frac{2 \pi * m }{B * e}[/tex]
=> [tex]T = \frac{2 * 3.142 * 1.672 *10^{-27} }{1.4 * 1.60 *10^{-19}}[/tex]
=> [tex]T = 4.691 *10^{-8} \ s [/tex]
Generally the number of revolution is mathematically represented as
[tex]n = \frac{t}{T}[/tex]
[tex]n = \frac{1*10^{-3}}{4.691 *10^{-8} }[/tex]
[tex]n = 2.132 *10^{4}[/tex]
you are at the grand canyon standing at the edge of a ledge 1857 m high you have a mass of 61 kg. you decide to take a selfie to share with your science teacher when you get home which causes you to wonder how much gravitational potential energy do you have standing at the edge of this cliff
Answer:
1,110,114.6 J
Explanation:
The height is 1857m, the mass is 61 kg, and the accelaration is 9.8 m/s^2. Plug in the equation GPE=h*m*a and you get 1,110,114.6.
h= height
m= mass
a= accelaration
GPE= gravitational potential energy
If you are at the grand canyon standing at the edge of a ledge 1857 meters high you have a mass of 61 kilograms, then your gravitational potential energy at the edge of the cliff would be 1111247.37 Joules.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
The total gravitational potential energy at the edge of the cliff would be
PE = m × g × h
PE =61 × 9.81 × 1857
PE =1111247.37 Joules
Thus, the total gravitational potential energy at the edge of the cliff would be 1111247.37 Joules.
Learn more about mechanical energy here, refer to the link given below;
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Pls help I’m being timed!!
The diagram shows the setup for an experiment involving a 1000 ml beaker, filled with 500 mL of water, sitting on a burner.
1000 ml
500 ml
Bumer
Which best describes the molecular motion of the water particles as the bumer supplies heat?
O A. The molecular motion will increase as less thermal energy is absorbed.
O B. The molecular motion will increase as more thermal energy is absorbed.
O C. The molecular motion will decrease as less thermal energy is absorbed.
O D. The molecular motion will decrease as more thermal energy is absorbed.
Answer:
B
Explanation:
Heat increase molecular motion
Answer:
B
Explanation:
The more motion there is in the molecules, the more thermal energy is absorbed.
Can an object moving upward be in free fall?
Answer:
not if its moving upwards but eventually it will be on its way down
Explanation: