Answer:
1.0
No
Explanation:
Answer:
| 1.0
|
|
| No
Explanation:
Somebody plz answer these 5 only thanks!!!
Will mark as brainliest
:D
Answer:
false
true
true
true
false
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
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
PLEASE HELP!! ILL MARK BRAINLYEST!!!
The process of a neutron splitting a nucleus into two parts is called _____.
A. fission
B. atomic
C. fusion
which has more inertia, a textbook or calculator
15.
All of the following parameters are forces except
Answer: What do you need help with?
Explanation:
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?
Who here has a dream to one day become something great?
ayoooooooooooooooooooooooooooooooooooo
If two charges attract each other, the two charges must be
Answer:
be negative
Explanation:
A truck took 4 hours to complete a journey. At the first 1 h 45 min, ít travelled at an average speed of 70 km/h. . For the rest of the journey, it travelled at an average speed of 80 0 km/h . What was the total distance of the journey?
Answer:
302.5 km
Explanation:
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]
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:
Which of the following stamentes obout weight trancing is true
Answer:
in my opinion weight trenching is true
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.
All of the following are regulated by the medulla except __________.
A.breathing
B.swallowing and vomiting
C.coughing and sneezing
D.the fight-or-flight response
Answer:
It's D. the fight-or-flight response
Explanation:
how would a planet move if the sun suddenly disappeared ?
Explanation:
The sun gravity keeps the solar system i.e planets in its place and orbits if there is no sun the planets would flying off and It would be complete and utter chaos in our solar system
A car traveling at 7 m/s accelerates at 2,5 m/s2 to reach a speed of 12 m/s. How long
does it take for this acceleration?
Answer:
The car took 2.5 seconds for this acceleration
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at[/tex]
Solving for t:
[tex]\displaystyle t=\frac{v_f-v_o}{a}[/tex]
The car was traveling at v0=7 m/s, accelerated at 2.5 m/s^2, and reached a speed vf=12 m/s. Calculating the time taken:
[tex]\displaystyle t=\frac{12-7}{2.5}[/tex]
[tex]\displaystyle t=\frac{5}{2.5}[/tex]
t=2 sec
The car took 2 seconds for this acceleration
Which of the following words BEST describes scientists’ current knowledge about the universe?
eternal
static
unpredictable
changing
Answer:
your answer is changing
Explanation:
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
Un auto recorre una carretera en línea recta de 10km y tarda 8 minutos ¿Cual es su velocidad en km/h?
20,83 m / s (metros por segundo)
divide 10 metros entre 8 minutos y obtén 20.83333333
20.83 m/s (meters per second)
divide 10 meters by 8 minutes and get 20.83333333
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:
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
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.
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)
What is the acceleration of an object with a 4500 g mass when there is a net force of 18 N on it?
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:
just wanna make sure im right
2. A runner jogs at 5m/s for 30 seconds. Determine the distance traveled by
the runner for the 30 seconds.
show the work please :)
Answer:
Hope this solution helps you.
A moving car backs into a parked car in a parking lot. Why would the bumpers on both cars be dented?
Answer:
Because the bumpers are a crumple zone.
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