Answer:
0.5
Explanation:
Given parameters:
Weight of object = 300N
Force of friction = 150N
Unknown:
Coefficient of friction = ?
Solution:
Frictional force is a force that resists the motion of a body.
It is mathematically expressed as;
frictional force = uN
Where u is the coefficient of friction
N = Normal force = weight of the object
Now input the parameters and find u;
150 = u x 300
u = [tex]\frac{150}{300}[/tex] = 0.5
The coefficient of friction here is 0.5
Can an object have a positive position, but a negative velocity? Explain your reasoning.
Answer:
Yes
Explanation:
A position describes the position of an object relative to the x/y-axis (or the four cardinal directions). A velocity is a vector quantity, defining speed with direction.
So if an object is in a positive position, it means they are in the positive x-axis direction (or wherever on the scale the positive values are stated to be) and if it has a negative velocity, it means said object is moving in the opposite direction of the positive x-axis. It is possible for the object to still be in the positive position as it's moving with a negative velocity
Consider a 400g baseball thrown from a height of 1.8m at 35m/s:
a. What is the gravitational potential energy of the baseball?
b. What is the elastic potential energy of the baseball?
c. What is the kinetic energy of the baseball?
d. What is the total mechanical energy of the baseball?
Answer:hhahe
Explanation:
1 point
1)A 1 kg brick is carried to up the Eiffel Tower to the 275 m platform. How
much gravitational potential energy does it acquire?
Answer:
The gravitational potential energy is 2,750 Joules
Explanation:
Given the following data;
Mass of brick = 1kg
Height of Eiffel Tower = 275m
Potential energy can be defined as the energy possessed by an object due to its position.
Mathematically, potential energy is;
[tex] P = mgh[/tex]
Also, we know acceleration due to gravity = 10m/s2
[tex] P = mgh[/tex]
[tex] P = 1 * 275 * 10 [/tex]
P = 2750 Joules.
Hence, the gravitational potential energy the brick acquired is 2750 Joules.
Molten (melted) iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide and pure carbon. Fe2O3 + 3C ---> 2Fe + 3CO If 4 moles of Fe2O3 are used, how many moles of Carbon Monoxide (CO) can be produced?
Answer:
Explanation:
Fe₂O₃ + 3C ---> 2Fe + 3CO
1 mole 3 moles
From the balanced equation above , we see that , 1 mole of Fe₂O₃ reacts with carbon to form 3 moles of CO .
So , 4 moles of Fe₂O₃ will react with carbon to form 3 x 4 moles of CO .
moles of CO formed = 3 x 4 moles = 12 moles.
Describe the nucleus of the atom.
Answer:
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger Marsden gold foil experiment. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud.
How are Covalent bonds formed?
I believe it is introduced when the variation between the electronegativities of only two atoms is way too small for any transfer to take place to produce new ions.
Considering the definition of covalent bond, Covalent bonds are formed when valence electrons of non-metallic elements are shared and hold this elements together, forming a molecule.
Covalent bondThe covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule.
Covalent bonds are established between non-metallic elements. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.
SummaryCovalent bonds are formed when electrons in the outermost level of non-metallic elements are shared and hold this elements together, forming a molecule.
Learn more about covalent bond:
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mechanical advantage of a simple machine is 4,what does it mean?
Answer:
I hope this answer is correct
Explanation:
The mechanical advantage of a machine is 4. Mechanical advantage MA is the ratio of output (generated by the machine) force to input (applied to the machine) force. So MA = 4 means that for example if you apply 100 N then your machine will multiply that force and generate 400 N.
how much force is needed to accelerate 300 kg at a rate of 4 m/s/s
Answer:
1200
Explanation:
Force = Mass x Acceleration
Answer:
[tex]\boxed {\tt 1,200 \ Newtons }[/tex]
Explanation:
Force can be found by multiplying the mass by the acceleration.
[tex]F=m*a[/tex]
The mass is 300 kilograms.
The acceleration is 4 meters per second squared.
[tex]m= 300 \ kg\\a= 4 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]F= 300 \ kg * 4 \ m/s^2[/tex]
Multiply.
[tex]F= 1200 \ kg * m/s^2[/tex]
1 Newton is equal to 1 kilograms meters per second squared, so our current answer of 1200 kg m/s² is equal to 1200 Newtons.
[tex]F= 1200 \ N[/tex]
The force needed is 1,200 Newtons.
if 6.75g of oxide of lead was reduced to 6.12g of metal, calculate the empirical formula of the oxide
A surfer travels for 45 min at an average speed of 0.6 kilometers per min. How far does he travel in that
time?
Answer:
you would do multiplication, d=rt. (distance=d rate=r time=t).
Explanation:
You already have all the variables figure out so just plug in the numbers.
For an easier equation you would just do .6*45=27, the 27 is the total kilometers in 45 minutes.
A car is traveling 30m/s and slams on the breaks, coming to a complete stop in 5 seconds.
Calculate its acceleration (assuming it was constant). Draw a graph of x-t, v-t and a-t.
Answer:
-6
Explanation:
a=vf-vi/t
vf=0
so that we you subtract vf to vi it will be -30/5=-6
If Earth’s mass was cut in half, what would happen to your mass? Why?
Answer: decrease.
Explanation:
If Earth's mass was cut in half, what would happen to your mass? it would decrease because gravitational force decreases.
Science
There are five elements of a universal systems model: goal, inputs, processes, outputs, and feedback. Which of the following describes the "processes" portion of this model?
A. the results of the system
B. information collected from the outputs
C. the money, time, and resources used on the model
D. what is done to the inputs
Answer:
d
Explanation:
Answer:
the answer is C. The money time and resources used on the model
Explanation:
chemical formulawhat is the chemical formula
Answer: A chemical formula is a way of showing and representing information about a chemical proportion of atoms that constitute a particular chemical compound or molecule
A toy car rolls down a hill starting from rest. After 4.2 seconds its velocity is 18 meters per second. What is the acceleration of the car ?
SOMEONE PLZ HELP :(
WILL MARK BRAILIEST
Answer: if this is the same question I think it’s 24
Explanation:
Together, Denise and her brother painted a total of 3 5 of a living room wall. Denise painted 3 5 of that part, and her brother painted the rest. What part of the living room wall did Denise paint herself? Denise paintedof the living room wall.
Answer:
9 ÷ 25
Explanation:
The computation of the part of the living room that should be painted is shown below:
= Living room painted × rest of the part painted
= 3 ÷ 5 × 3 ÷ 5
= 9 ÷ 25
We simply multiplied with the above two items and the same is to be considered
hence, the part of the living room i.e. painted is 9 ÷ 25
The same is to be considered
HeLp AsAp!!!!!! How long would it take you to hop 30 meters based on your speed for the 5-meter trial? Show your work!
Hopping =
Distance-5 m
Time-3.41
Speed-1.46
Answer:
20.5s
Explanation:
Given parameters:
Distance = 30m
Unknown:
Time = ?
Solution:
The time it will take to hop a distance of 30m using the speed for the 5m trial is the duration of the trip.
The speed for the 5m trial = 1.46m/s
Now;
Speed = [tex]\frac{distance}{time}[/tex]
Distance = speed x time
time = [tex]\frac{distance }{speed}[/tex]
Input the parameters and solve;
time = [tex]\frac{30}{1.46}[/tex] = 20.5s
find weight of 45 kg at height 800 km from earth's surface?
Answer:
The weight is 348.4 N
Explanation:
Effect of the Altitude on the Acceleration of Gravity
The effect of gravity decreases with altitude because greater altitudes mean greater distances from the Earth's center.
The practical formula to calculate the gravity as a function of the altitude h is:
[tex]{\displaystyle g_{h}=g_{0}\left({\frac {R_{\mathrm {e} }}{R_{\mathrm {e} }+h}}\right)^{2}}[/tex]
Where go is the conventional gravitational acceleration = [tex]9.80665\ m/s^2[/tex]
R is the Earth's mean radius at the equator = 6,378 Km
h is the altitude.
At a height of h=800 Km, the acceleration of gravity is:
[tex]{\displaystyle g_{h}=9.80665 m/s^2\left(\frac {6,378 Km }{6,378 Km+800Km}}\right)^{2}}[/tex]
Calculating:
[tex]g_h=7.74\ m/s^2[/tex]
The weight is the product of the acceleration of gravity by the mass of the object, thus:
[tex]W=45\ Kg\cdot 7.74\ m/s^2=348.4\ N[/tex]
The weight is 348.4 N
Mention the relation between horsepower and watt.
What is the fullform of amu ?
Answer:
a power level of 1 hp is approximately equivalent to 746 watts or 0.746kilowatts by 746. To convert from watts to horsepower, multiply by 0.00134. To convert from horsepower to kilowatt, multiply by 0.746
Pllzzzz help I will mark u as a brainliest
Answer:
You dont need BRAINLY there is an app called slader where you scan the textbook barcode and it shows you the answers for the question in the textbook.
Explanation:
Where are streams located?
Answer:
Larger seasonal streams are more common in dry areas. Rain-dependent streams (ephemeral) flow only after precipitation. Runoff from rainfall is the primary source of water for these streams. Like seasonal streams, they can be found anywhere but are most prevalent in arid areas.
Explanation:
HELP PLEASE
Find the net force necessary for a 15 kg object to accelerate at 20 m/s/s.
Answer:
The answer is 300 NExplanation:
The force acting on an object given the mass and acceleration we use the formula
force = mass × accelerationWe have
force = 15 × 20
We have the final answer as
300 NHope this helps you
please help
Which equipment is best to hold and to measure liquids?
A). flask and graduated cylinder
B). scale and ruler
C). caliper and thermometer
D). stopwatch and beaker
Answer:
I'm pretty sure that the answer is A
Which of these equations will you used to find the final velocity if the initial
velocity and time is given? *
Answer:
2.77 would be the answer for this
The fastest human ever recorded was Usain Bolt at 43 km/h. If a white tail
deer can run 3 km in 3 minutes and 45 seconds, how many km/h faster would Usain Bolt need to run to catch a deer?
Please show work! Will mark brainliest!
Which of the following describes the relationship between work and power
Answer:
Power is the rate which work is done.
Explanation:
Power is the rate which work is done. Power is measured in watts.
Work is the use of force to move an object. Work is measured in joules
A runner moves at an average speed of 3.0 m/s and covers 9.5 km. In seconds, how long does the run take?
28.5 s
29.0 s
3.16 s
3200 s
Answer:
3200 seconds
Explanation:
If he ran at 3 m/s for 28.5 seconds, he would have run 85.5 meters
29 seconds would be 87 meters run not 9.5 km
A unit is an amount used to measure something True or false
I do not know
hi I thinks the answer is Tralse
In which box could “gas” be placed?
*C. W is not the answer
A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.
The tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is
Answer:
239.2 N
Explanation:
Given that a vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.The tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is
The tension in the rope and the weight of the mass will be acting in an opposite direction.
T - mg = ma ....... (1)
Where acceleration a = Velocity/ time
a = 3.5 / 0.7
a = 5 m/s^2
Substitutes acceleration a into the equation 1 above.
T - 40 × 9.8 = 40 × 5
T - 39.2 = 200
T = 200 + 39.2
T = 239.2N
Therefore, the tension in the rope needed to give the object an upward speed of 3.50 m/s
in 0.700 s is 239.2N
Answer:
The answer is T=592 N
Explanation:
Fw= 392N
a=v/t, so a=3.5ms^-1/0.7s
a=5ms^-2
Fnet=ma
T-Fw=ma
T-392N=40kg(5ms^-2)
T=592N