If 100.0 g of a substance releases 45 kJ of energy as it cools from 13.0°C to –15.0°C, what is the specific heat capacity of the substance?
Answer:
16,071.42J/kgKExplanation:
The formula for expressing the quantity of heat released is expressed as;
Q = mcΔt
m is the mass of the substance = 100g - 0.1kg
c is the specific heat capacity of the substance
Δt is the change in temperature = 13 -(-15) = 28°C
Substitute and get c;
45000 = 0.1c(28)
2.8c = 45000
c = 45000/2.8
c = 16,071.42J/kgK
Hence the specific heat capacity of the substance is 16,071.42J/kgK
After completing an experiment, all chemical wastes should be
Answer:
The correct answer is
C. disposed of according to your instructor’s directions
Explanation:
The question is not complete here is the complete one with options to choose from
After completing an experiment, all chemical wastes should be
A. taken home
B. dumped in the sink
C. disposed of according to your instructor’s directions
D. left at your lab station for the next class
Which observation supports a model of the nature of light in which light acts as a wave?
A. Constructive interference
B. Temperature change
C. Blackbody radiation
D. Photoelectric effect
Answer:
Explanation:
Hope this helps!
Answer:
a. constructive interference
Explanation:
100% correct
PLEASE ANSWER FAST
Calculate the density of an object with a mass of 15.6 grams and a volume of 2 cm3
Given :
Mass of object, m = 15.6 grams.
Volume of object, V = 2 cm³.
To Find :
The density of the object.
Solution :
We know, density of an object is given by :
[tex]\rho = \dfrac{m}{V}\\\\\rho = \dfrac{15.6}{2}\ grams/cm^3\\\\\rho = 7.8\ grams/cm^3[/tex]
Hence, this is the required solution.
What is the momentum of a two-particle system composed of a 1400 kg car moving east at 70 m/s and a second 1300 kg car moving west at 85 m/s? Let east be the positive direction and answer to 3 significant figures.
Answer:
209000 kg*m/s
Explanation:
Momentum is caclucated using the equation P=mv. Where m is mass and v is velocity.
If you are required to show your work it would be the following:
1400*70=98000 kg*m/s
1300*85=110500 kg*m/s
98000+110500=208500 kg*m/s
209000 kg*m/s
Please Help Me!!!!!!
Answer: B
Explanation: It states they have the same mass so the eliminates the majority of the answers. Density = mass/volume so if sample A & B have the same mass but A is heavier that means A has more volume than sample B
5) A car travels 150 km in 2 hours. What is its speed?
(Show the correct units.)
Answer:
75km/hr
Explanation:
distance(d)=150km
time(t)=2hours
speed=distance/time
=150/2
=75km/hr
How much work is done when a 100 N force moves a block 59 m?
Answer:
5900J
Explanation:
Work=Forse*Distance
work = J, Jewls
100*59=5900
Hop this helps and can u think about brainlist
i put a picture on how to find these answers, if u got any more questions im here
HELP PLEASE FOR BRAINLIEST!
Find the volume of an object with a density of 3.1 g/mL and a mass of 12 g.
Answer:
Density = Mass/Volume => Volume = Mass/Density = 12/3.1 = 3.87ml
Explanation:
Answer:
3.9 mL
Explanation:
To find the volume of an object using its mass and density, we can use the following formula:
Volume = Mass/Density
Volume = 12/3.1
Volume ≈ 3.9
Therefore, the volume of the object is 3.9 mL.
I hope this helps!
please please help
The law of conservation of charge states that the total charge remains the same after a transfer of electrons.
true or false
Answer:
true
Explanation:
The law of conservation of charge states that whenever electrons are transferred between objects, the total charge remains the same.
a high school physics student with a mass of 68.18 KG is sitting in a seat reading this question the magnitude of the force with which the seat is pushing up upon the student is
A) 6.96 N
B) 66.82 N
C) 668.16 N
D) 1200 N
Metamorphic rock occurs when you take any other type of rock and put them under ________ and ______________, and they twist and meld together.
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of options. However, metamorphic rocks are rocks that are formed from other pre-existing rocks under heat and pressure (both are usually high), causing them to twist and melt together. Metamorphism simply means a change in form of something and that's what happens here also.
Pls Solve this!!!Im giving 20 points and Brainliest to the one who answers first. HELP ME PLEASE!!!!!!!!
Answer:
i) 2Mg + O₂ + Δ Heat → 2MgO + Δ Energy
ii) The aqueous solution does not change in the color of the blue litmus paper and the blue litmus paper remains blue in color
The aqueous solution formed using the product (MgO) turns the red litmus paper blue
Explanation:
i) Magnesium easily burns in air or oxygen when heated to form a white powder of magnesium oxide. The burning (reaction) of magnesium in air is an exothermic reaction that involves the release of heat and light
The burning of magnesium wire is given by the following chemical reaction;
2Mg + O₂ + Δ Heat → 2MgO + Δ Energy
ii) When magnesium oxide is mixed with water if forms magnesium hydroxide Mg(OH)₂ as shown in the following chemical reaction;
MgO + H₂O → Mg(OH)₂
Magnesium hydroxide is basic and therefore it will turn red litmus paper blue and it does not change the color of the blue litmus paper.
What is the mass of an object which has a momentum of 560 kg m/s and is traveling at 15 m/s?
Answer:
plane
Explanation:
How does work affect energy between objects so it can cause a change in the form of energy?
Sol
Work transfers energy.
O Work changes energy
O Work increases energy.
O Work decreases energy.
Answer:
Doing work' is a way of transferring energy from one object to another, energy is transferred when a force moves through a distance.
Explanation: So more energy, more work done bc u transferred more energy to move the object and doing the work. and if you only use a little of energy, the work done also only a little.
WORTH 50 POINTSSSS!!!!!!!! don't lie either if you do I will report your answer and get my points back idc !!!!!!
This political cartoon summarizes proposed legislation to stop immigration into the United States through the use of
A. Income
B. Military force
C. Building a barrier wall
D. Educational requirements
Answer:
C is the correct answer and i hope ur having a good day UwU
Explanation:
77. Two blocks, with masses m1 = 400 g and m2 = 600 g, are connected by a string and lie on a frictionless tabletop. A force F = 3.5 N is applied to block m2. Find the acceleration of each object.
Answer:
See the answers below. And the free body diagrams attached.
Explanation:
To solve this problem, we must build a free body diagram, where we show the forces acting on a body, first for the m2 body, where the force of 3.5 [N] acts to the right. In such a way that a reaction force is presented in the opposite direction due to the string tied between both bodies, we will call this force T1.
Now using Newton's second law, which is defined as the sum of forces equal to the product of mass by acceleration, we can determine an equation as a function of T1.
∑F = m*a
[tex]3.5 -T_{1}=0.6*a_{2}[/tex]
We have an equation with two unknowns, in such a way we must perform a second free body diagram for the body with mass m1, to acquire the additional equation.
∑F =m₁*a₁
[tex]T_{1}=0.4*a_{1}[/tex]
By kinematics we know that if the string tied to Body 2 moves a distance, the part of the string at the end tied to body 1 will move the same distance. This same analysis is valid for velocities and accelerations.
This is the accelerations a1 and a2 are equal. Now equalizing both equations.
[tex]3.5-0.4*a_{1}=0.6*a_{2}\\but\\a_{1}=a_{2}\\3.5-0.4*a_{1}=0.6*a_{1}\\a_{1}=3.5[m/s^{2} ][/tex]
The acceleration of each block connected by the given string is 3.5 m/s².
The given parameters;
mass of the first block, m1 = 400 g = 0.4 kgmass of the second block, m2 = 600 g = 0.6 kgapplied force, F = 3.5 NThe net force on the blocks is calculated as follows;
[tex]\Sigma F = ma\\\\F - T = m_2a\\\\F - m_1(a -g)= m_2a\\\\g = 0 \ , \ in \ horizontal \ direction\\\\F - m_1a = m_2 a\\\\F = m_2 a + m_1 a\\\\F = a(m_1 + m_2)\\\\a = \frac{F}{m_1 + m_2} \\\\a = \frac{3.5 }{0.4 + 0.6} \\\\a = 3.5 \ m/s^2[/tex]
Thus, the acceleration of each block connected by the given string is 3.5 m/s².
Learn more here:https://brainly.com/question/20357188
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light; how much energy is dissipated as heat?
A 735 kg object and a 1.37×1012 kg are located 2.59×104 m away from each other. What is the force due to gravity between the two objects?
Answer:
Fg=1.02*10^-4 N
Explanation:
Fg=Gm1m2/r^2
You may have noticed that there was a big difference in the results of
the two hollow pipe experiments, but very little difference in the solid chunk experiments.
Why do you think this was the case?
ANSWER QUICK PLS!
Answer:
For conduction you don't need position. For convection you do.
Explanation:
you just needed to look it up LOL <3
True or False: Solar energy drives winds around the globe as warm water and land heat the air.
Answer:
False
Explanation:
When an old building is to be torn down, Mr. Pham’s company removes the bricks, cleans off the mortar from the bricks, and then sells the bricks to companies that restore historic buildings. Which compound is Mr. Pham’s company most likely to use in its work?
hydrochloric acid
nitric acid
sodium hydroxide
lithium hydroxide
Answer:
hydrochloric acid
Explanation:
The compound Mr. Pham's company used is most likely hydrochloric acid.
Hydrochloric acid is a strong acid and it is applied to remove corrosion and rusts from another body.
For industrial purposes, they are used as cleansing agents.The acid is capable of dissolving and breaking down the rust and corrosion.
A base does not have this property and would not effectively remove the corrosion.
Sodium hydroxide and lithium hydroxide are bases.
Nitric acid is not as strong as hydrochloric acid.
Answer:
hydrochloric acid
Explanation:
i just did the test 3 minutes ago.
hope this helps and have a good day.
:)
1. Place these unknown pH test papers in order from most acidic to most alkaline.
А в
C D
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
pH color chart
A. Paper D. paper C, paper B, paper A
B. Paper B, paper A, paper C, paper D
C. Paper C, paper D, paper A, paper B
D. Paper D, paper C, paper A, paper B
Answer: B
Explanation: look at the chart, easy
Answer:
D
Explanation:
if a 60 kg person was standing on a platform at the surface of saturn and they jumped, they would have to push with a force greater than..?
Answer:
A 60 kg person standing on a platform at the surface of Saturn and they jumped, they would have to push with a force greater than 540 N
Explanation:
The gravitational attraction between an object on the surface of a planet and the planet is given by the weight of the object
Therefore the force needed to be applied for an object to lift off the surface of a planet = The weight of the object
The weight of the object on the surface of a planet = m × g
Where;
m = The mass of the object
g = The strength of gravity on the planet's surface in N/kg
The given parameters are;
The mass of the person standing on a platform at the surface of Saturn, m = 60 kg
The strength of gravity on the surface of Saturn = 9 N/kg
Therefore, we have;
The weight of the person = The force greater than which the person would have to push on the surface of Saturn so as to Jump = The weight of the person on the surface of Saturn = 60 kg × 9 N/kg = 540 N
Therefore, for a 60 kg person standing on a platform at the surface of Saturn and they jumped, they would have to push with a force greater than 540 N.
A statue of a great baseball player weighs 2400 N and has a base that is 4 m x 2 m. What is the pressure the statue exerts on the floor?
Answer:
300N/m²
Explanation:
Pressure is calculated using the formula;
Pressure = Force/Area
Given
Force = 2400N
Area = 4m×2m = 8m²
Substitute the given parameters into the formula as shown;
Pressure = 2400/8
Pressure = 300N/m²
Hence the pressure the statue exerts on the floor is 300N/m²
Can anyone help me. . .
Answer:
welll
Explanation:
i honestly dk
What are the types of motion that can be observed in a pendulum ? Some one please answer.√
Answer:
periodic motion
Explanation:
The massive object is affectionately referred to as the pendulum bob. When the bob is displaced from equilibrium and then released, it begins its back and forth vibration about its fixed equilibrium position. The motion is regular and repeating, an example of periodic motion.
6. List three behaviors of light that support the theory that light travels in waves.
Then describe and/or draw each behavior.
Answer:
Light has the unique property that it can be described in physics as both a wave and as a stream of particles called photons
Explanation:
Answer:
Light has the unique property that it can be described in physics as both a wave and as a stream of particles called photons
Explanation:
PLZZZ HELP
In addition to how much force Earth exerts on the object, which features of an object affect its weight?
A.mass and location of the object
B.shape and location of the object
C.location of the object and how much energy the object has
D.mass of the object and how much energy the object has
Answer/Explanation:
The weight of an object is defined as the force that is exerted due to the gravitational force.
Mathematically, it can be written as :
W = m g
Where
m is the mass of the object
g is the acceleration due to gravity
Also,
We know that the value of g varies with respect to the location. At the equator, the value of g is less as compared to the poles.
The feature of an object that affects its weight are :
Mass of the object
Location of the object
How much force Earth exerts on the object
Which type of wave forms at the boundary between air and water when you
drop a rock into a pond?
A. Electromagnetic
B. Surface
C. Longitudinal
D. Transverse