Answer:
Momentum of the skier is 350 Kg.m/sec
Explanation:
Momentum of a body can be calculated using the following rule:
P = m * v
where:
P is the momentum of the body
m is the mass of the body given as 70 Kg
v is the velocity of the body given as 5 m/sec
Substitute with the givens in the above rule to get the momentum of the skier as follows:
P = m * v
P = 70 * 5
P = 350 Kg.m/sec
Hope this helps :)
Which transfers heat from one object to another without transferring matter?
A. conduction
B. insulation
C. thermal expansion
Answer:
A. Conduction
Explanation:
Heat is transferred from one object to another but does not involve the movement of particles between the two objects. The only condition for this to happen is for the objects to be in contact. Contact ensures that adjacent particles transmit energy between them. It is measured in watts per meter per kelvin W/mK
Insulation prevents transfer of heat.
Thermal expansion is one effect of transfer of heat.
Conduction is one of the three ways to transfer heat, and one of the two ways to do it without transferring matter. (A)
If you drive 12 miles north and 35 miles east, what is the direct distance between you and your starting point?
Answer:
For this, you need the pythagorean theorem, which is a^{2}+ b^{2}= c^{2}
Your a should be 12, and your b should be 35. So now you can solve for c, which equals 37 miles.
So the answer is 37 miles
One benefit of the SI system is that it is ____.
Answer:
One benefit of the SI system is that it is 'based on multiples of 10'.
Explanation:
One main benefit of the SI system is that it is based on multiples of 10. Which means that conversion to similar units is easier.
For example, you just need to multiply or divide by 10 to change from grams to kilograms and vice versa.
Also, the standard units defined by the International System of Units are consistent around the world which makes it easier to comprehend and communicate using them.
The SI system, or International System of Units, is beneficial because it is a universal and standardized system of measurement used worldwide in scientific domains. This avoid the need for unit conversion and ensures consistency in scientific communication.
Explanation:One benefit of the SI system, which stands for International System of Units, is that it is universal. This means it is widely used throughout the world in all domains of scientific measurement. It's a standardized system of measurement that uses seven base units, including the meter for length, the kilogram for mass, and the second for time, among others.
This makes it easier for scientists, researchers, and students alike to understand and communicate data without needing to convert units. Its universality and consistency make it a fundamentally important tool in many fields including physics, engineering, and chemistry.
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A student measured the density of gold to be 19.1 g/cm^3. The accepted value of the density of gold is 19.3 g/cm^3. What is the percent error of the student's measurement?
A. 0.20%
B. 1.71%
C. 1.04%
D. 1.39%
Answer:
C. 1.04%
Explanation:
The following information has been provided;
Actual density of gold; 19.3 g/cm^3
Observed/measured density of gold; 19.1 g/cm^3
The formula for percent error is given as;
((actual value - observed value)/actual value)) * 100
[tex]\frac{19.3-19.1}{19.3}*100=1.0363[/tex]
The percent error of the student's measurement is thus 1.04%
The percent error of the student's measurement is 1.04%.
Explanation:
The percent error of the student's measurement can be calculated using the formula:
Percent error = |(measured value - accepted value) / accepted value| * 100%
In this case, the student measured the density of gold to be 19.1 g/cm^3, while the accepted value is 19.3 g/cm^3. Plugging these values into the formula, we get:
Percent error = |(19.1 - 19.3) / 19.3| * 100% = 0.104 * 100% = 1.04%
Therefore, the percent error of the student's measurement is 1.04% (option C).
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What mistake did Carl make?
Carl makes the table below to determine the number of
atoms of each element in the chemical formula 4Ca(CIO3)2.
Element Calculation
Calcium 1x4
Chlorine 1 x 2
Oxygen 3 x 2
Total atoms
4
2
6
He did not multiply the calcium atoms by the subscript 2.
He did not add the coefficient 4 to the chlorine and oxygen
atoms.
He did not add the subscript 2 to the calcium atoms.
He did not multiply the chlorine and oxygen atoms by the
coefficient 4.
Answer:
He did not multiply the chlorine and oxygen atoms by the coefficient 4
Explanation:
Answer:
The correct answer is:
'He did not multiply the chlorine and oxygen atoms by the coefficient 4'.
Explanation:
Number of atoms in [tex]4 Ca(ClO_3)_2[/tex]
The 4 in front of molecular formula of calcium chlorate is its coefficient . it tells us about the molecules or moles of compound.
Number of calcium in 1 molecule of calcium chlorate = 1
Calcium atoms in 4 molecule of calcium chlorate = 1 × 4 = 4
Number of calcium in 1 molecule of calcium chlorate = 2
Chlorine atoms in 4 molecule of calcium chlorate = 2 × 4 = 8
Number of oxygen in 1 molecule of calcium chlorate = 3 × 2 = 6
Oxygen atoms in 4 molecule of calcium chlorate = 6 × 4 = 24
So, number of atoms of different elements calculated by Carl was wrong as he didn't multiplied the coefficient 4 with chlorine and oxygen atoms.
A magnetic field applies forces on:
a)static charges
b)moving charges
c)water flow
Answer:
moving charges b)
I think this is the answer
Answer:
It is moving charges.
A scientific law tells us what nature will do under certain conditions.
True
False
Hello There!
This Is A "True" Statement.
A scientific law tells us what nature will do under certain conditions.
Q: The acceleration of gravity means that for each second that passes, falling objects move 9.8m? A:True
Answer: false
Explanation:
Answer:
False
Explanation:
If the object covers 9.8 m every second then it has a constant velocity of 9.8 m/s
The acceleration implies that there is a change in velocity. With a constant acceleration the velocity will change linearly.
[tex]S = ut + \frac{1}{2} gt^2[/tex]
The distance traveled each second will not be a constant, it will be a quadratic function as mentioned above.
Diamond will scratch quartz. True or False
Answer:true, diamonds will scratch quartz.
Explanation: diamonds have a more compact composition. That is what makes them so hard. Quartz composition is not that compact, so diamond can scratch it.
Carbon can only form ionic compounds
Answer:
The answer is true.
Explanation:
Which team sport utilizes judges to determine the points earned? Football Hockey Rhythmic Gymnastics Soccer
Answer:
Rhythmic Gymnastics
Explanation:
In general, the judges in the sports tend to be in charge for correcting and controlling the breaking of the rules in the particular sport. They are allowed to punish the competitors in accordance with the breaking of the rule, or they are there in order to determine weather a point is regular or not. In the rhythmic gymnastics though, and sports similar to it, the judges have different role, as they are in charge of determining the points earned by the competitors. This is done in a manner where every judge gives certain amount of points, or grades, and when those are summed up, the competitors get their total points.
how much power is used to lift a 1.9 kg brick 1.9 in 2.s
Answer:
18W
Explanation:
Power=work/time
Work =force x distance
Force = mass x acceleration due to gravity
F=1.9 x 10
F= 19N
W=19 x 1.9
W=36.1J
P=36.1/2
P= 18watts
A rock collection comes from which part of Earth?
Answer:
rocks form from the outer solid layer of the earth which is the crust
Explanation:
Answer:
Crust
Explanation:
Rock is a solid mass, a collection of minerals which occur naturally. There are three different types of rocks- Igneous, Sedimentary and Metamorphic. These vary in texture and composition. The rocks come from the upper most layer of the Earth- the crust. Heat, pressure, volcanoes, wind and water play important role in formation of rocks.
A projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.
The velocity of the projectile the moment it was launched, rounded to the nearest hundredth, is
Answer:
5.09 m/s
Explanation:
Use the height to find the time it takes to land:
y = y₀ + v₀ᵧ t + ½ gt²
0 = 8.0 m + (0 m/s) t + ½ (-9.8 m/s²) t²
t = 1.28 s
Now use the horizontal distance to find the initial velocity.
x = x₀ + v₀ₓ t + ½ at²
6.5 m = 0 m + v₀ (1.28 s) + ½ (0 m/s²) (1.28 s)²
v₀ = 5.09 m/s
The velocity of the projectile the moment it was launched, rounded to the nearest hundredth would be 5.09 m/s.
What is a projectile motion?It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
As given in the problem, a projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.
y = y + v ×t + 1/2 × gt²
0 = 8.0 + v t + 1/2 × -9.8 × t²
t = 1.28 s
x = x + v t + 1/2 at²
6.5 m = v 1.28 + 1/2 × 1.28²
v = 5.09 m/s
Thus, the velocity of the projectile the moment it was launched, rounded to the nearest hundredth, is 5.09 m/s.
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How Antman can breathe when his size is smaller then oxygen molecules?
ANSWER ASAP 50 POINTS
Which of the following illustrates how a Venus fly trap senses that an insect has landed in its open leaves?
1. Using tiny hairs, the leaves sense a change in light.
2. Using tiny hairs, the leaves taste a chemical.
3. Using tiny hairs, the leaves detect a touch.
4. Using tiny hairs, the leaves sense a change in water levels.
Answer:It turns out the Venus flytrap is a power plant, capable of generating electrical signals. Each trap is actually a modified leaf: a hinged midrib, which would be the central vein of a more familiar leaf, joins the two lobes, which secrete a sweet sap to attract insects.
Explanation:The leaves of Venus' Flytrap open wide and on them are short, stiff hairs called trigger or sensitive hairs. When anything touches these hairs enough to bend them, the two lobes of the leaves snap shut trapping whatever is inside.
Answer:
The answer is #3
Explanation:
What is the electric potential at a point in space if a charge of 7.3 × 10-17 coulombs at that point has a potential energy of 6.4 × 10-17 joules?
Answer:
0.88 volts
Explanation:
We are given the amount of charge of a point ( 7.3 × 10^-17 ) along with its potential energy ( 6.4 × 10^-17 joules ).
We are to find the electrical potential at this point.
To find this, we will use the following formula:
[tex]V = \frac{Ep}{q}[/tex]
Substituting the given values in the above formula:
[tex]V = \frac{Ep}{q}V = \frac{6.4 * 10^{-17}\:J}{7.3 * 10^{-17}\:C}[/tex]
V = 0.88 volts
Answer:
V= 1.32 V
Explanation:
Electrical potential energy is calculated using the equation
Ue=1/2CV² where C is the charge and V the voltage at that point in space.
Making V the subject of the formula;
V= √( 2Ue /C)
V= √(2×6.4×10⁻¹⁷÷(7.3 × 10⁻¹⁷))
= 1.32 V
if there's a small amount of friction between two surfaces, the result could be _______
select all that apply
A. no movement
B. heat
C. a little bit of movement
D. sliding around
Answer:A little bit movement
Explanation:
Answer:
all of them
Explanation:
ape x
A wave with a frequency of 500 Hz is traveling at a speed of 100 m/s.what is the wavelength?
Answer:
0.2m
The solution is in the picture
The beta decay of a radioactive isotope results in the conversion of a neutron into a proton and an electron. Assume that scientists have discovered that a new element is formed. Which of the following would best support our understanding that the proton defines an element’s identity?
Question 3 options:
The atomic number decreases by one.
The atomic number increases by one.
The mass number increases by one.
The mass number decreases by one.
Select the correct answer.
Anna will wear a black dress when she attends het cousin's wedding. Which color(s) does the dress absorb?
A.
all colors
B. no colors
C. red and green
D. white
Answer:
A: all colors, because black is the absence of color.
Explanation:
Answer:
The answer is option A
Explanation:
Hope it helps
a measure of how consistently a result is determined by repeated evaluations is called
Answer:
The answer is precision.
Answer:
Precision
Explanation:
Accuracy is the measure of how close to the actual value a reading is. Precision refers to the degree of closeness the values are to each other while taking a reading.
For example, if a manufacturer says the length of the table is 50 cm, then if you measure it you should also get 50 cm reading, this shows the reading is accurate. If the reading of the table is taken multiple times then if the values are suppose 49.9, 49.94 etc, then the reading is precise.
an object is acted upon by a force of 22 Newtons to the right and 13 Newtons to the left what is the magnitude and direction of the net force
22N to the right and 13N to the left
Forces are in opposite directions so you subtract the bigger force from the smaller force
Magnitude of force= 22N -13N
= 9N
net force direction is to the right
A localized impediment to electron flow in a circuit is a:
resistor
source of emf
conduit
conductor
when a sound's intensity increases by a factor of 10, its decibel reading increases by how many decibels?
Answer:
If sound intensity increases by a factor of 10, the decibel reading increases by 10.
Explanation:
Decibel scale:
In order to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one. This scale is the decibel scale. every increase of 3 dB represents a doubling of sound intensity.
Increase in decibel scale is given by the formula:
n = 10*log(Increased Intensity of sound/Original Intensity of Sound
n = 10*log(I/I₀)
In our case the sound intensity increases by a factor of 10. So I/I₀ increased by 10 times and will be 10 I/I₀
n = 10*log(10 I/I₀)
n = 10*log(10) + 10log(I/I₀)
n = 10 + 10*log(I/I₀)
This shows that the decibel reading is increased by 10 points.
Answer:
10
Explanation:
true or false static is weightless colorless and odorless
Answer:
True.
Explanation:
What happens to light waves from a star as the star moves toward Earth?
AL(OH)2 is__
an acid
a base
a salt
What is one advantage of using secondary sources when doing research?
Answer:
It saves time and cost nothing than to get the same information that would cost money.
In your own words, describe the purpose of using a chemical equation.
Answer:
The purpose of using a chemical reaction is to diagram a reaction, where the left side is formed by reactants and the right side is formed by the product. Through diagraming a reaction, chemists can hypothetically change parts of the both components, that way they would see what to expect in the reaction. Also, they can measure the approximation of amount of mass they would need, and see how components will change after the reaction