Answer:
Technique of comparing abundance ratio between radioactive isotopes to a reference isotope to determine the age of a material called radioactive dating. It determines the age by having a more abundance of isotopes in the cellular being.
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
Un consumator electric conectat la o tensiune de 220V are rezistenta electrica R=100ohmi Ce putere electrica are consumatorul? 1 point 484W 220W 440W
50 POINTS !!!
What happens to ice when in water?
While having an argument, two people each push on a couch with 200 N of force in opposite directions. What is the net force on the couch? Explain how you found the answer.
Answer:
Explanation:
Net force = 0
This is a very instructive question to do. Here's what the situation looks like
[tex]====>\box{Couch) }<====\\[/tex]
The two forces are going in opposite directions. One is going 200 N to the right and the other is going 200N to the left.
The net result is 0.
Put in formula form, it looks like this.
Going left is the negative direction
F_right - F_left = 200 - 200 = 0
An LED light bulb is favored over an incandescent light bulb because it is more , what?
An LED light bulb is favoured because it is more bright.
An LED light is favored over an incandescent light bulb because it is more bright than the incandescent bulb.
What is an LED bulb?An LED is a light emitting diode. It is used widely for the production of light because it shows some advantages which include:
Many traditional lighting systems like the incandescent bulbs turn more than 90% of the energy which they use to heat, allocating only about 10% of energy to actual light production. LEDs emit almost no heat energy, and most of the light energy they emit is within the visible spectrum.
LEDs use much less energy than that of incandescent bulbs because the diode light is much more efficient, power-wise, than the filament light. LED bulbs use more than 75% less energy than those of incandescent lighting.
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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
A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge?
A. 2.2 ɥC
B. 680 ɥC
C. 2.2 C
D. 680 C
can someone explain this in detail because im having a hard time understanding these type questions...thank you!!
Answer:
A. 2.2 ɥC
Explanation:
Given;
electric field strength, E = 1236 N/C
distance of the source charge, r = 4 m
Electric field strength is calculated as;
[tex]E = \frac{kQ}{r^2}[/tex]
where;
Q is the magnitude of the source charge
k is Coulomb's constant = 9 x 10⁹ Nm²/C²
[tex]E = \frac{kQ}{r^2} \\\\kQ = Er^2\\\\Q = \frac{Er^2}{k} \\\\Q = \frac{(1236)(4^2)}{9 \ \times \ 10^9} \\\\Q = 2.197 \ \times \ 10^{-6} \ C\\\\Q = 2.197 \ \mu \ C[/tex]
Therefore, the correct option is A. 2.2 ɥC
In your own words explain how energy is involved in physical changes and in chemical changes
Answer:
All adjustments in issue include changes in energy. Energy is either delivered or consumed. The energy is often in the form of heat, however it might be in the form of sound or light.
Explanation:
this is in my own words btw:)
A sled is slowing down at the bottom of a snowy hill.
Which statement describes the sled's motion?
The sled has a constant velocity.
The sled is accelerating.
Is a sled slowing down at the bottom of a snowy hill accelerating or constant velocity
Answer:
A sled and its rider are moving at a speed of along a horizontal stretch of snow, as Figure 4.24a illustrates. The snow exerts a kinetic frictional force on the runners of the sled, so the sled slows down and eventually comes to a stop. The coefficient of kinetic friction is 0.050. What is the displacement x of the sled?
1. Identify the phase or phases of matter (solids, liquids, and gases) that
apply to each statement. More than one phase of matter may apply to each
statement.
a. Molecules do not move around, but vibrate in place
b. Has volume but no particular shape
c. Flows
d. Molecules break free of intermolecular forces
e. Does not have a volume or shape
f. Molecules can move around and switch places, but remain close
together
Answer:
a: solid
b: liquid
c: liquid
d: gas
e: gas
f: liquid
Explanation:
According to the forces of attraction, the states of matter in each case serially are as follows: solid, liquid,liquid,gas,gas and liquid respectively.
What is matter?Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter can neither be created nor destroyed rather is conserved at end of chemical change.
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Which is NOT a part of an electric motor?
a.
armature
b.
brushes
c.
commutator
d.
slip ring
2. What is the acceleration of gravity on Planet x on which an object weights 300 N if it weighs 98 N on Earth?
Answer:on Planet X on which an object weighs 300 N if it weighs 98 N on Earth? ... How are weight, mass, and acceleration due to gravity related
Explanation:
Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds. Who provides the biggest power? Show your working.
Answer: Sam provides the biggest power
Explanation: Power is defined, in Physics, as the rate of work done. Work is energy transferred to an object due to the force causing the displacement of the object.
So, to determine Power:
For Sam:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{F.d}{t}[/tex]
[tex]P=\frac{300.5}{30}[/tex]
P = 50 Watts
The unit for Power is [P] = J/s = Watt
For Gary:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{1000}{25}[/tex]
P = 40 Watts
Comparing power of Sam and Gary, we can conclude that Sam provides the biggest power of 50 Watts.
what happens when two forces at same direction
Answer:
Explanation:
· If two forces are in the same direction, then one adds them to find the net force, which is the vector sum of these forces. However, when two forces act in opposite direction, one has to subtract the lesser force from the larger one to find the resulting force. The resultant is the direction of the larger of these two forces.
A dart is thrown from 1.50 m high at 10.0 m/s toward a target 1.73 m from the ground. At what angle was the dart thrown?
Answer:
The angle of projection is 12.26⁰.
Explanation:
Given;
initial position of the dart, h₀ = 1.50 m
height above the ground reached by the dart, h₁ = 1.73 m
maximum height reached by the dart, Hm = h₁ - h₀ = 1.73 m - 1.50 m= 0.23 m
velocity of the dart, u = 10 m/s
The maximum height reached by the projectile is calculated as;
[tex]H_m = \frac{u^2sin^2 \theta}{2g}[/tex]
where;
θ is angle of projection
g is acceleration due to gravity = 9.8 m/s²
[tex]H_m = \frac{u^2sin^2 \theta}{2g}\\\\sin^2 \theta = \frac{H_m \ \times \ 2g}{u^2} \\\\sin^2 \theta = \frac{0.23 \ \times \ 2(9.8)}{10^2} \\\\sin ^2\theta =0.04508\\\\sin \theta = \sqrt{0.04508} \\\\sin \theta = 0.2123\\\\\theta = sin^{-1}(0.2123)\\\\\theta = 12.26^0[/tex]
Therefore, the angle of projection is 12.26⁰.
Two objects are shown below. One is neutral and the other is negative. What do you predict would happen?
Answer:
The body becomes a positive charged body.
Explanation:
Given that two objects are shown below. One is neutral and the other is negative. What do you predict would happen?
According to the law of static electricity, like charges repel each other while unlike charges attract each other.
Since one of the object is neutral and the other one is negative, there will neither attraction nor repulsion between them.
Also, according to Electrostatic induction, the neural body can be charged and becomes positive.
The negative body will attract all the positive charges to its side, and repel all the negative charges to the other side. If the body is touched at the other end, the whole negative charges will be earthed and the body will become a positive body.
A term used to describe a critical assessment of how an athlete acts and what they achieve either during a match or while training is known as:
A. SMART Target
B. Area of improvement
C. Performance analysis
D. Measurement of success
Answer:
I believe D
Explanation:
I'm not for sure but I think it is D
5. How much power is dissipated when 0.2 ampere of current flows through a 100-ohm resistor ?
Answer:
P=I*I*R
Where P is power
I is current
R is Resistance
P=2*2*100
P=400W
Explanation:
Power is the rate of doing work.
From the Ohm’s law V=IR
Power=I*I*R
how many elements does lythium have
Answer:
three 3
Explanation:
Which type of mirror would you use to cook a hot dog and why?
How will recreation be affected by sea level rise?
Answer:
Scientists predict that sea levels could rise up to six-feet by 2100. An increase this large will swallow beaches—impacting public access, beach recreation, and healthy ecosystems. ... With less sand beach-goers will have a completely different recreational experience in the future.
Explanation:
H+ H+He
A. alpha decay
B. beta decay
C. nuclear fusion
D. nuclear fission
Help
Answer:
c. nuclear fusión oh A. alpha decay
A distance of 0.002 m separates two objects of equal mass. If the gravitational force between them is
0.0104 N, find the mass of each object.
Answer: 24.97 kg
Explanation:
The gravitational force between two objects of masses M1, and M2 respectively, and separated by a distance R, is:
F = G*(M1*M2)/R^2
Where G is the gravitational constant:
G = 6.67*10^-11 m^3/(kg*s^2)
In this case, we know that
R = 0.002m
F = 0.0104 N
and that M1 = M2 = M
And we want to find the value of M, then we can replace those values in the equation to get
0.0104 N = (6.67*10^-11 m^3/(kg*s^2))*(M*M)/(0.002m)^2
(0.0104 N)*(0.002m)^2/(6.67*10^-11 m^3/(kg*s^2)) = M^2
623.69 kg^2 = M^2
√(623.69 kg^2) = M = 24.97 kg
This means that the mass of each object is 24.97 kg
What is always true about the light ray that emerges from the right side of the lens?
Name one process that requires a force in the human body. Hint: the question is asking about something happening inside of the body like muscle contractions.
Answer:
Movement
Explanation:
please help me!! will mark brainliest
True or False: Solar energy drives winds around the globe as warm water and land heat the air.
Answer:
False
Explanation:
this is life science
Shawn is doing drills out on the field by pulling a tire behind him for 30 m. If Shawn is applying a net force of
1200 N to pull the tire, then how much work is Shawn doing?
Answer:
The work done by Shawn in moving the tire is 36,000 J
Explanation:
Given;
net force applied by Shawn , F = 1200 N
distance he moved the tire, d = 30 m
The work done by Shawn in moving the tire is calculated as;
W = Fd
Substitute the given values and solve for Work done;
W = 1200 x 30
W = 36,000 J
Therefore, the work done by Shawn in moving the tire is 36,000 J
6. Which phase of matter has a definite volume and shape.
a. solid
b. liquid
c. gas
d.plasma
Answer:
solids
Explanation:
beacause if you take an ice cube does it change its shape no and if it has a definite shape it is sure to have a definite volume