Answer:
1/2 MV squared
1/2*5*3 squared
=22.5
a piece of wood has mass of 250g and volume of 400cm cubed. what is its density
Answer:
[tex] 0.625 \: g {cm}^{ - 3} [/tex]
Explanation:
[tex]density \: = \frac{mass}{volume} \\ \\ = \frac{250}{400} \\ \\ = 0.625 \: g {cm}^{ - 3} [/tex]
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
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).
A ball is tossed with enough speed straight up so that it is in the air several seconds. Assume upward direction is positive and downward is negative. Part A What is the velocity of the ball when it reaches its highest point?
Answer:
Answer:
The velocity of the ball when it reaches its highest point is 0
Explanation:
The velocity of the ball when it reaches its highest point is 0
Once the ball is tossed into the air, as it goes up, the initial velocity with which it was thrown, reduces, as the motion of the ball is hindered by several forces such as gravity and air resistance. This slows down the velocity of the ball, up until it reaches a point, where the upwards velocity of the ball becomes zero. at this point, the ball begins to fall back to the ground.
1. A book has a weight of 3.5 Newtons. So the force to lift it would also be 3.5
Newtons. If you lift it up to a shelf, and apply the force for 4 meters, how much
work is done?
Answer:
anashe
Explanation:
full
Answer:
w=fxd
w=3.5x4
w=14
this is the correct answer
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 !
- ☾
The Tethered Satellite discussed in this module is producing 5.00 kV, and a current of 10.0 A flows. (a) What magnetic drag force does this produce if the system is moving at 7.80 km/s? (b) How much kinetic energy is removed from the system in 1.00 h, neglecting any change in altitude or velocity during that time? (c) What is the change in velocity if the mass of the system is 100,000 kg? (d) Discuss the long term consequences (say, a week-long mission) on the space shuttle’s orbit, noting what effect a decrease in velocity has and assessing the magnitude of the effect.
Answer:
The answers as per the given problem is solved in the segment below.
Explanation:
According to the question,
(a)
[tex]F=ILB[/tex]
By putting the values, we get
[tex]=10(2\times 10^4)(5\times 10^{-5})[/tex]
[tex]=10 \ N[/tex]
(b)
[tex]W=Fx[/tex]
or,
[tex]=Fvt[/tex]
[tex]=10(7.80\times 10^3)(3600)[/tex]
[tex]=2.81\times 10^8 \ J[/tex]
(c)
[tex]\frac{1}{2}mv'^2 =\frac{1}{2}mv^2-\omega[/tex]
or,
[tex]v=[v^2-\frac{2 \omega}{m} ]^\frac{1}{2}[/tex]
[tex]=[(7.8\times 10^3)^2-\frac{2(2.81\times 10^8)}{1\times 10^5} ]^{\frac{1}{2} }[/tex]
[tex]=7.79\times 10^3 \ m/s[/tex]
now,
[tex]\Delta v=v-v'[/tex]
[tex]=0.36 \ m/s[/tex]
(d)
The speed difference is around 1 percent throughout a week's trip. Generally, a decrease throughout the speed will indeed lead the orbit towards spiral inwards, ever since the speed would not have been adequate to maintain that rotational velocity.As nothing more than a result, this same shuttle could very well could use a little more propellant to sustain the velocity of aspiration if the orbit were ever to spiral somewhat within the vehicle.I need help on an essay on Electric Charge
Answer:
Electric force is caused by electric charge. Electric charge is a property of the bits of matter within atoms. Electric force can cause matter to attract or repel because there are two kinds of charge – positive and negative charge.
The effects of electric force can be summarized as the law of electric charge: Pieces of matter with the same kind of charge repel each other. Pieces of matter with the same kind of charge attract each other. 2 objects with a positive charge repel each other, as do 2 objects with a negative charge.
Most objects are made of matter with equal amounts of positive and negative charge. Objects with the same # of positive and negative charges are electrically balanced, or neutral. Electric force is observed only when the balance of charge on objects is disturbed.
An electric charge on an object that causes the object to attract or repel other objects is called static electricity. The adjective static describes something that does not move. Charges on an object are called static electricity to contrast then with the moving charges in an electric current.
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]
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
The spiral spring of a spring balance is 25.0cm long when 5N hangs on it and 30cm long when the weight is 10N , what is the length of the spring , if the weight is 3N assuming Hooke's law is obeyed ?
Explanation:
let the length be Lcm
5−325−L = 10−530−25
L = 23cm
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
There are 12 third grade students and 15 4th grade students in the band they will travel to a concert in cars that can hold four students each which of these can be used to find out how many cards are needed to drive the students
Answer:
#_cars = 7
Explanation:
For this exercise let's start by finding the total number of students
#_students = 12 +15
#_students = 27
Now we can use a direct proportion relationship or rule of three. If 4 students drive, how many cars for 27 students?
#_cars = 27 (¼)
#_cars = 6.75
the number of cars must be an integer therefore the correct answer is
#_cars = 7
Explain the difference between sound waves and radio waves
Answer:
They are totally different.
Explanation:
However, sound and radio waves are completely different phenomena. Sound creates pressure variations (waves) in matter, such as air or water, or your eardrum. Conversely, radio waves are electromagnetic waves, like visible light, infrared, ultraviolet, X-rays, and gamma rays
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!
The process of converting energy produced by wind turbines into electricity is about 40 percent efficient. If the transport of electricity is 90 percent efficient and fluorescent light bulb efficiency is known to be 20 percent, what is the overall efficiency for converting wind into fluorescent lighting
Answer: 7.2%
Explanation:
Given
Efficiency of converting energy produced by wind into electricity is about [tex]\eta_1=40\%[/tex]
Transport of electricity efficiency [tex]\eta_2=90\%[/tex]
Fluorescent light bulb efficiency is [tex]\eta_3=20\%[/tex]
Overall efficiency is the product of all the efficiencies i.e.
[tex]\Rightarrow \eta=\eta_1\times \eta_2\times \eta_3\\\\\Rightarrow \eta=0.4\times 0.9\times 0.2\\\Rightarrow \eta=0.072\ \text{or}\ 7.2\%[/tex]
Therefore, the overall efficiency is 7.2%
An ideal step-down transformer has a turns ratio of 1/106. An ac voltage of amplitude 170 V is applied to the primary. If the primary current amplitude is 8.10 mA, what is the secondary current amplitude
Answer:
[tex]I_2=0.8586A[/tex]
Explanation:
From the question we are told that:
Turns Ratio i.e[tex]\frac{N_2}{N_1}=\frac{1}{106} (step down)[/tex]
Voltage [tex]v=170v[/tex]
Primary current amplitude[tex]I_1= 8.10 mA =>8.10*10^{-3}A[/tex]
Generally the equation for a Transformer is mathematically given by
[tex]\frac{E_1}{E_2}=\frac{I_2}{I_1}=\frac{N_1}{N_2}[/tex]
Therefore
[tex]I_2=\frac{N_1}{N_2}*I_1[/tex]
[tex]I_2=106*8.10*10^{-3}[/tex]
[tex]I_2=0.8586A[/tex]
A baseball is thrown with a speed of 36 meters per second (m/s). What is the distance
from the mound to home plate if the ball takes 0.5 seconds to leave the pitcher's hand
and cross the plate?
72 meters
41 meters
31 meters
18 meters
18 meters
36m/s ÷ 2 = 18 m/s
Answer:
D
Explanation:
Formula
d = r * t
Givens
r = 36 m/s
t = 0.5 sec
Solution
d = r * t
d = 36 * 0.5
d = 18 m/s
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.
When placed near another charge, a 20 microcoulomb charge experiences an attractive force of 0.080 N. What is the electric field strength at that location?
Answer:
E = 4000 N/C
Explanation:
Given the following data;
Force = 0.080 N.
Charge, q = 20 microcoulomb = 20 * 10^-6 = 2 * 10^-5 Coulombs
To find the electric field strength;
Mathematically, the electric field strength is given by the formula;
Electric field strength = force/charge
Substituting into the formula, we have;
E = 0.080/0.00002
E = 4000 N/C
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:
what type of object is called the object at rest ? sort answer.
In short :
An object is said to be at rest when it doesn't change is position with respect to a stationary object which is taken as its reference point or origin of the object, as the time passes.
______________________________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.
What is the kinetic energy of a 0.4 kg football being thrown at 35 m/s?
14 J
490 J
245 J
137.2 J
Answer:
245 J
Explanation:
1) 35^2 = 1225
2) 1225 * 0.4 = 490
3) 490 ÷ 2 = 245
please help asap no links
[tex]\huge \mathcal\pink{Answer}[/tex]
So, Speed of light in Rock salt is 1/1.54 times speed of light in vacuum. Therefor Speed of light in Rock salt is less [1.94 x 10⁸m/s ] compared to speed of light in vacuum =C = 3 x 10⁸ m/s.
3. Can abiotic and biotic factors affect one another? Provide an example.
Abiotic variables are particularly essential since they have a direct impact on organisms' ability to live.
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
Two glass rods are rubbed together. One of the glass rods are brought near (but
does not touch) an uncharged pith ball. Would you expect the pith ball to attract,
repel, or do nothing? Explain why.
Answer:
The correct answer is - do nothing.
Explanation:
If two same or identical objects, in this instance two glass rods, were rubbed together they neither attract nor repel each other as there is no transfer of electrons from one material to the other material as there is no difference in their charges.
Only two different objects are able to transfer electrons from one material to the other material if rubbed together, to produce the conditions for static electricity to be observed. Therefore there would be no charge on the glass rod so there would be no charge to balls to repel or attract.
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: