Answer:
[tex]v = u + at (upward)\\ 0 = 45 \sin(20) - 9.81t \\ t = 1.56s[/tex]
Lab: Kinetic Energy What is the purpose of the lab, the importance of the topic, and the question you are trying to answer? What is your hypothesis (or hypotheses) for this experiment? What methods are you using to test this (or each) hypothesis? Section II: Data and Observations Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings? Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report? Section III: Analysis and Discussion What do the key results indicate? If you constructed graphs, what trends do they indicate in your data? Were there any problems with the experiment or the methods? Did you have any surprising results? Section IV: Conclusions What do the results tell you about your hypothesis(es)? How do the data support your claim above? If you could repeat the experiment and make it better, what would you do differently and why?
Pls hurry!!!!!!!! Worth 100 pts!
You have a grindstone (a disk) that is 98.0 kg, has a 0.335-m radius, and is turning at 100 rpm, and you press a steel axe against it with a radial force of 23.6 N. Assuming the kinetic coefficient of friction between steel and stone is 0.192, calculate the angular acceleration of the grindstone.
Answer:
[tex]a=0.276[/tex]
Explanation:
From the question we are told that:
Mass [tex]m=98.kg[/tex]
Radius [tex]r=0.335[/tex]
Angular velocity [tex]\omega=100rpm[/tex]
Radial force of [tex]F_r=23.6 N.[/tex]
Kinetic coefficient of friction [tex]\mu=0.192[/tex]
Generally the equation for Kinetic Force is mathematically given by
[tex]F_k=\mu.F_r[/tex]
[tex]F_k=0.192*23.6[/tex]
[tex]F_k=4.5312[/tex]
Generally the equation for Torque on Center is mathematically given by
[tex]Ia=f_k*r[/tex]
Where
[tex]I=\frac{Mr^2}{2}[/tex]
Therefore
[tex]a=\frac{2f_k}{Mr}[/tex]
[tex]a=\frac{2*4.5312}{98*0.335}[/tex]
[tex]a=0.276[/tex]
Therefore Angular acceleration of the grindstone is
[tex]a=0.276[/tex]
The circular motion of water molecules extends to a depth that is equal to:a. wave height/wavelength.b. wave height/wave period.c. wavelength/wave height.d. wavelength/2.e. wavelength/20.
Answer:
d. wavelength/2.
Explanation:
The circular motion of water molecules extends from regions of shallow water to deep water. It ranges from a depth, H < L/20 for shallow water to a depth of H > L/2 for deep water where L is the wavelength of the wave.
For depths greater than L/2,the circular motion is not affected by the wave energy. So, the maximum depth for the circular motion is L/2 = wavelength/2.
What physical quantity do you obtain when you divide
molar mass (Mm) by molar volume (Vm)?
Answer:
The mass density (ρ)
Explanation:
The molar volume (Vm) is the volume that a mole of an element or compound occupies at standard temperature and pressure STP
The molar volume can be found as follows;
[tex]Vm = \dfrac{Mm}{\rho}[/tex]
Where;
Mm = The molar mass
ρ = The mass density
The molar mass (Mm) of an element or a compound is the ratio of the mass of the element or compound to the amount of the element or compound in the given mass
The mass density, ρ, of an element or a compound is the mass of a unit volume of the element or compound
Therefore, we have;
[tex]\rho = \dfrac{Mm}{Vm}[/tex]
When we divide the molar mass (Mm) by the by the molar volume (Vm), we obtain the mass density (ρ).
An object rolls east at a steady speed of 12 m/s for 3.0 seconds. What distance did it travel?
O A. 36 m
o B. 24 m
O C. 18 m
O D. 7.0 m
Answer:
[tex]\boxed {\boxed {\sf A. \ 36 \ m}}[/tex]
Explanation:
The distance an object travels is the product of its speed and time.
[tex]d=s \times t[/tex]
The object's speed is 12 meters per second and the time is 3 seconds.
s= 12 m/s t= 3 sSubstitute the values into the formula.
[tex]d= 12 \ m/s \times 3 \ s[/tex]
Multiply. Note that the units of seconds will cancel, so we are left with meters as our units.
[tex]d= 12 \ m * 3[/tex]
[tex]d= 36 \ m[/tex]
The object travels a distance of 36 meters and choice A is correct.
Electrons made to vibrate to and fro at a few hundred thousand hertz emit radio waves. What class of waves is emitted from electron vibrations of a few million billion hertz
Answer:
this frequency is in the near UV range
Explanation:
The accelerated movement of a charge creates an electromagnetic wave, the speed of the wave is the speed of light
c = λ f
the emitted frequency is f = 10⁶ 10⁹ Hz = 10¹⁵5 hz,
light of this frequency is in the near UV range
what is the correct name for a bond between two phosphorus adtoms and three oxygen atoms
Covalent
Explanation:
Covalent Bond
Answer:
diphosphorus trioxide
Explanation:
Find the current flowing across the 20 Ω
resistor. .
35 Ω
20 Ω
15 Ω
10V
[?]Α
Please no links
0.23 A across the 20-ohm resistor
Explanation:
The 20-ohm and 35-ohm resistors are in parallel so their combined resistance is
(1/20) + (1/35) = 0.0786 ohm^-1 or 12.73 ohms
These two are in turn connected in series with the 15-ohm resistor so the total resistance of the circuit is
R = 12.73 ohm + 15 ohm
= 27.73 ohm
Hence, the total current drawn by the circuit is
I = V/R = (10 V)/(27.73 ohm)
= 0.36 A
The potential across the 15-ohm resistor is
V1 = IR = (0.36 A)(15 ohm)
= 5.4 V
Now the potential across the 20-ohm and 35-ohm resistors is
V2 = V - V1 = 10V - 5.4V
= 4.6 V
This means that the current across the 20-ohm resistor is
I = V/R = (4.6 V)/(20 ohm)
= 0.23 A
Answer:
Answer would be 0.23
Explanation:
Put in 0.23
You’ve probably seen how the surface of a tire can partially melt and leave a mark on the road when a car’s brakes are applied really hard. Explain why the surface of the tire melts.
Answer:
The friction of braking heats up the tire and the road. The temperature is so high that it reaches the melting point of the rubber in the tire. The melting rubber is what leaves a mark on the road.
Explanation:
Answer:
the friction of braking heats up the tires and the road. then the temperature gets even hotter to the point where it melts the rubber.
Explanation:
this is my answer so be careful how you copy it, but you've got this guys schools is almost out stay strong an have fun and be safe this summer keep pushing <33.
remember you're loved by many
- Jason Edwards 5/15/23
Hell please thanks!!!!!!’
Answer:
liquid phase
Explanation:
it is liquid phase because molecules are not that tightly packed as solid and not that far away from each other as in gas phase.
can you explain the three main important reason why we use machine
Answer:
HERE IS YOUR ANSWER
Explanation:
1. The machines makes pur life easier.
2. It makes us do our works faster.
3. It does all the works that are harder for us.
Hope it helps you.
Explanation:
First of all some do most of the work for us
Second, us humans are quite lazy
Third, it makes it quite easier in life
What object currently has the most gravitational potential energy?
A, B, C, or D
Answer:
A
Explanation:
this because
gravitational potential energy = mass x height x gravitational field strength
so let's assume mass is 2 kg and gravitational field strength is 10 N /kg
so when height is very low, take it as 3 m
gravitational potential energy= 2 x 3 x 10 = 60 j
but when height is 6m
gravitational potential energy = 2 x 6 x 10 = 120 j
so when the height is the greatest, the gravitational potential energy is the highest
so A is the heighest so it has the highest gravitational potential energy.
hope this helps
please mark it brainliest :D
How can I become an astronaut I'm currently 13 urs old
4.) What determines a star brightness? *
a. Size
b. Temperature
c. Size & Temperature
d. Color & Temperature
A chemical plant produces ammonia using the following reaction. What
trade-off is made by running the reaction at a high temperature?
3H2 + N2 + 2NH3 + energy
O A. The higher temperature decreases the forward reaction rate, and
the pressure of the system is also lowered.
O B. The higher temperature increases the reaction rate, but it also
favors the reverse read on.
C. The higher temperature increases the forward reaction rate, and
the higher pressure increases the reaction rate.
D. The higher temperature decreases the reaction rate, but it also
favors the forward reaction.
Answer: B
Explanation: The higher temperature increases the reaction rate but also favors the reverse read on.
The higher temperature increases the reaction rate, but it also favors the reverse read on. So, option B.
What is meant by rate of a reaction ?The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction.
Here,
Generally, reactions progress more quickly as the temperature rises.
The average kinetic energy of the reactant molecules will rise with a rise in temperature. The number of molecules having threshold energy rises, increasing the quantity of efficient collisions that actually occur.
Therefore, as the temperature of the reaction is increased, the rate of the reaction increases. But also favors the reverse reaction.
Hence,
The higher temperature increases the reaction rate, but it also favors the reverse read on.
To learn more about rate of reaction, click:
https://brainly.com/question/30546888
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A grocery shopper tosses a(n) 8.6 kg bag of rice into a stationary 18.1 kg grocery cart. The bag hits the cart with a horizontal speed of 5.2 m/s toward the front of the cart. What is the final speed of the cart and bag
Answer: 1.67 m/s
Explanation:
Given
Mass of bag is [tex]m=8.6\ kg[/tex]
Mass of cart is [tex]M=18.1\ kg[/tex]
bag hits the cart with horizontal speed of [tex]u=5.2\ m/s[/tex]
Suppose the system move with speed v after collision
Conserving the momentum
[tex]\Rightarrow mu+M(0)=(M+m)v\\\\\Rightarrow v=\dfrac{mu}{M+m}\\\\\Rightarrow v=\dfrac{8.6\times 5.2}{18.1+8.6}\\\\\Rightarrow v=1.67\ m/s[/tex]
If an element forms a 1-ion, in which group of the periodic table would you
expect to find it?
A. 17
Ο Ο
B. 1
C. 2
Ο Ο
D. 18
(It’s A. 17)
4. A car accelerates at 2.5 m/s^2, covers 4 km in 0.8 min. How fast was it moving at the beginning
of the time interval? *
Answer:
Initial velocity, u = 23.33 m/s
Explanation:
Given the following data;
Acceleration = 2.5 m/s²
Distance = 4 km to meters = 4000 meters
Time = 0.8 mins to seconds = 0.8 * 60 = 48 seconds.
To find the initial velocity, we would use the second equation of motion;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Where;
S represents the displacement or height measured in meters.
u represents the initial velocity measured in meters per seconds.
t represents the time measured in seconds.
a represents acceleration measured in meters per seconds square.
Substituting into the equation, we have;
4000 = u*48 + ½*2.5*48²
4000 = 48u + 1.25*2304
4000 = 48u + 2880
48u = 4000 - 2880
48u = 1120
Initial velocity, u = 1120/48
Initial velocity, u = 23.33 m/s
Why do the planets orbit the Sun in an elliptical shape?
Answer:
That's essentially how objects in orbits work as they move closer to the body they orbit, they accelerate faster and faster. Our penny will get so fast that, once it comes around the planet, it will be flung very far away, which will then slow it down. This is what creates an elliptical orbit.
Explanation:
2ZnS plus 2O2 yields 2ZnO plus SO2 what is number in each category and is it balanced or unbalanced
Answer:
2 ZnS + 3O2 ---> 2ZnO + 2 SO2
Explanation:
2 ZnS + 2O2 ---> 2ZnO + SO2
There are 2 Zn atom on the LHS and 2 Zn on the RHS. Hence the Zn is balanced on both sides of the equation.
There are two S atom on the LHS but there is only one S atom on the RHS.
Hence we will balance the S atoms
2 ZnS + 2O2 ---> 2ZnO + 2 SO2
Now the oxygen is unbalanced as there are three oxygen molecule on the RHS but only two on the LHS.
Hence, the balanced equation would be
2 ZnS + 3O2 ---> 2ZnO + 2 SO2
Around the turn of the twentieth century, inventor Robert Shuman was engineering products that used energy directly from the Sun to power motors and farms. He stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun. During which stage of technological design did Shuman identify that using oil and coal would be a problem? first second third fourth
Answer: First stage
Explanation:
The four stages of technological design include:
• identifying a problem.
• Designing a solution.
• Implement, build, and test the design.
• Determine if solution met the need.
In this scenario, Robert Shuman identified the problem. This was depicted as he stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun,
HELPPPPPPPO
In the diagram, q1 = +6.60*10^-9 C and
q2 = +3.10*10^-9 C. Find the magnitude
of the total electric field at point P.
Explanation:
is this the full question?
Answer:
1258.46
Explanation:
Acellus
A 120 volt refrigerator uses 650 watts. Calculate how much work is done by the refrigerator in one hour?
Answer:
2,340,000 J
Explanation:
Work done can be described as when energy or force is applied to an object to cause displacement
Work done is measured in joules
1 Watt = 1 Joule / second
650 watts = 650 Joules / second
convert 650 joules to seconds by multiplying by 3600
650 x 3600 = 2,340,000 J
If an atom becomes an ion by loosing 4 electrons, what will the net charge of the atom be? pls hurry NO LINKS!
1) -1.6 x 10^-19 C
2) - 3.2 x 10^-19 C
3) - 4.8 x 10^-19 C
4) -6.4 x 10^-19 C
Answer:
1) - 35
2) - 35
3) - 67
4) - 83
Why do people sound weird when they breath in balloon air?
Answer:
your voice travels much more quickly across your vocal cords, also LOT less density which causes the sound to travel over twice as fast through helium than it does regular air.
ballon Air = Helium
Hope this helps and brainlist is appreciated !
- ☾
for every 100 joules or useful energy output, the heater wastes 100 joules, find the input energy of the heater.
Which of the following has greater kinetic energy?
(a). A 10 g meteor hurtling (Moving at greater speed) through the Earth’s atmosphere at 5.0 km s−1. (b). A 65 kg jogger running at 5.0 m s−1.
please help me
why are the layers of the earth in the order that they are in?
Answer:
Each layer has its own properties, composition, and characteristics that affects many of the key processes of our planet. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.
Explanation:
"Heat conduction to skin": Suppose 175 W of heat flows by conduction from the blood capillaries beneath the skin to the body's surface area of 1.5 m2. If the temperature difference is 0.70°C, estimate the average distance of capillaries below the skin surface.
Answer:
Explanation:
Thermal conductivity of human skin K = 21 W / m²
Formula for heat conduction
Q = KA ( θ₂ - θ₁) / d
A is surface area , θ₂ - θ₁ is temperature difference , d is thickness .
Putting the values
175 = 21 x 1.5 x .70 / d
d = .126 m
= 12.6 cm .
NO LINKS PLEASE HELP The Spring Tide is found during which moon phases?
Question 5 options:
First and Last quarter
Full and New Moon
Waxing and Waning Gibbous
It varies each month
Answer:
Full and New Moon
Explanation: