Answer:
L = 3.51
Explanation:
Pendulum equation is T = 2pi[tex]\sqrt{L/9.81}[/tex]
T = 1.5 and we are solving for L
1.5=2[tex]\pi \sqrt{L/9.81}[/tex]
square both sides to get 2.25 = 2[tex]\pi ( L/9.81)[/tex]
multiply both sides by 9.81 then divide by 2 and 3.14 as a substitue for pi. The answer should be about 3.51 in length
L = 3.51
If this helps, mark me brainliest pls
A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.50 km/s in the +x-direction experiences a force of 2.25 \times 10^{-16} N2.25×10 −16 N in the +y-direction, and an electron moving at 4.75 km/s in the -z-direction experiences a force of 8.50 \times 10^{-16} \mathrm{N}8.50×10 −16 N in the +y-direction.
(a) What are the magnitude and direction of the magnetic field?
(b) What are the magnitude and direction of the magnetic force on an electron moving in the -y-direction at 3.20 km/s?
Answer:
a) B = 0.9375 T -z, b) B = 1.54 T
Explication
a) The magnetic force is
F = q v x B
f = q v B sin θ
bold indicates vectors
For direction let's use the right hand rule.
If the charge is positive
the flea in the direction of velocity, toward + x
the fingers extended in the direction of B
the palm the direction of the force + and
therefore the magnetic field goes in the direction of -z
F = q v B
2.25 10-16 = 1.6 10-19 1.50 103 B
B = 2.25 10-16 / 2.4 10-16
B = 0.9375 T -z
b) now an electron
thumb speed direction, -z
opposite side of palm force + y
therefore the direction of the magnetic field is + x
B = F / qv
B = 8.5 10-16 / 1.16 10-19 4.75 103
B = 1.54 T
Select the correct answer.
A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?
OA.
2 minutes
OB.
2 hours
O c.
45 minutes
OD.
45 hours
O E.
90 minutes
Reset
Next
Answer:
B. 2 hours
Explanation:
45 miles an hour times 2 is 90 miles in 2 hours
Answer:
B. 2 Hours
Explanation:
If your going at a constant speed of 45 miles per hour then, it will take two hours because 45x2 is 90. and if you divided 90 and 45, you will get 2.
A certain CD has a playing time of 74.0 minutes. When the music starts, the CD is rotating at an angular speed of 480 revolutions per minute (rpm). At the end of the music, the CD is rotating at 210 rpm. Find the magnitude of the average angular acceleration of the CD. Express your answer in rad/s2.
Answer: [tex]0.00636\ rad/s^2[/tex]
Explanation:
Given
CD has a playing time of [tex]t=74\ min\ or\ 74\times 60\ s[/tex]
Initial angular speed of CD is [tex]480\ rpm[/tex]
Final angular speed of DC is [tex]210\ rpm[/tex]
Angular speed, when rpm is given
[tex]\omega =\dfrac{2\pi N}{60}[/tex]
[tex]\omega_i=\dfrac{2\pi \times 480}{60}\\\\\Rightarrow \omega_i=16\pi \ rad/s[/tex]
Final speed
[tex]\Rightarrow \omega_f=\dfrac{2\pi \times 210}{60}\\\\\Rightarrow \omega_f=7\pi \ rad/s[/tex]
Using equation of angular motion
[tex]\Rightarrow \omega_f=\omega_i+\alpha t[/tex]
Insert the values
[tex]\Rightarrow 7\pi =16\pi +\alpha \times 74\times 60\\\Rightarrow -9\pi =\alpha \cdot (4440)\\\\\Rightarrow \alpha=-\dfrac{9\pi}{4440}\\\\\Rightarrow \alpha=-0.00636\ rad/s^2[/tex]
Magnitude of angular acceleration is [tex]0.00636\ rad/s^2[/tex]
A 27 W light bulb is connected to a 7.8 V battery. How much current flows through
the bulb?
Answer:
3.46 A
Explanation:
electrical power = current × voltage
P = I × V
We have,
V = 7.8
P = 27
Thus, I = P ÷ V
I = 27 / 7.8
= 3.46 A
When an object levitates, the magnetic force causes the object to repel. Without this magnetic force, ________ would pull the object down.
Answer:
gravity
Explanation:
I don't know what the explanations would be
A guy wire 1000 feet long is attached to the top of a tower. When pulled taut it makes a 42˚ angle with the ground. How tall is the tower? How far away from the base of the tower does the wire hit the ground?
Answer:
669.1 ft and 743.1 ft
Explanation:
Given data
Lenght of wire= = 1000ft
Angle = 42˚
Applying SOH CAH TOA
1. How tall is the tower?
SOH
sine ∅= opp/hyp
sin 42= opp/1000
0.6691= Opp/1000
0.6691*1000= Opp
Opp=669.1 ft
Applying SOH CAH TOA
2.How far away from the base of the tower does the wire hit the ground?
CAH
cos ∅= adj/hyp
cos 42= adj/1000
0.7431*1000=adj
adj=743.1 ft
What is the saying that can help you remember the order of the visible spectrum? ROYBVIG ROYGBIV RIBYOVG RYOBIVG
Answer:
ROYGBIV
Explanation:
mark me brainliest pls
Answer:
ROYGBIV
Explanation:
A child is holding a wagon from rolling straight back down in a driveway that inclined at 20 degree horizontal. if the wagon weigh 150n with what force must the child pull on the handle if the handle is parallel to the incline?
Answer:
F = 51.3°
Explanation:
The component of weight parallel to the inclined plane must be responsible for the rolling back motion of the car. Hence, the force required to be applied by the child must also be equal to that component of weight:
[tex]F = Parallel\ Component\ of\ Weight\ of\ Wagon= WSin\theta\\[/tex]
where,
W = Weight of Wagon = 150 N
θ = Angle of Inclinition = 20°
Therefore,
[tex]F = (150\ N)Sin\ 20^o[/tex]
F = 51.3°
define rectilinear propagation of light
Answer:
Electromagnetic waves to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density. This is called refraction. Light does not deviate when travelling through a homogeneous medium, which has the same refractive index throughout. Wikipe
if soap falls on the floor is the floor clean or is the soap dirty
Answer:
both
the cleen soap is falling on a nasty floof cleans the floor and gets dirty
Explanation:
Answer:
UH UH
Explanation:
the mass of an ice block is 500kg and density is 920kg\m^3. calculate the volume of an ice block
The volume of an ice block will be 0.543 m³.
What is density?Density is defined as the mass per unit volume. It is an important parameter to understand the fluid and its properties. Its unit is kg/m³.
The mass and density relation is given as
mass = density × volume
The given data in the problem is as ;
v is the volume of ice block =?
ρ is the density = 920kg/m³
m is the mass of ice block = 500kg
The mass and density relation is given as;
mass = density × volume
500 kg =920kg/m³ ×v
v=0.543 m³
Hence, the volume of an ice block will be 0.543 m³.
To learn more about the density refer to the link;
https://brainly.com/question/952755
#SPJ2
Two objects of the same radius start from rest and roll without slipping down a ramp. The objects are a hollow cylinder and a solid cylinder. Which one of them reaches the bottom of the ramp first?
Answer:
Solid cylinder
Explanation:
because hollow may blow and just bounce
que estudia la estática?
Which statement describes a characteristic of deposition
Explanation:
when soil builds up over time in the location
Suppose that an electron and a positron collide head-on. Both have kinetic energy of 1.20 MeV and rest energy of 0.511 MeV. They produce two photons, which by conservation of momentum must have equal energy and move in opposite directions. What is the energy Ephoton of one of these photons
Answer:
E = 1.711 MeV
Explanation:
From the law of the conservation of energy:
[tex]K.E_{e}+K.E_p + E_{e}+E_{p} = 2 E[/tex]
where,
[tex]K.E_e=K.Ep=[/tex] the kinetic energy of positron and electron = 1.2 MeV
[tex]E_e=E_p =[/tex] Rest energy of the electron and the positron = 0.511 MeV
E = Energy of Photon = ?
Therefore,
[tex]1.2\ MeV + 1.2\ MeV + 0.511\ MeV + 0.511\ MeV = 2E\\\\E = \frac{3.422\ MeV}{2}\\\\[/tex]
E = 1.711 MeV
laser light sent through a double slit produces an interference pattern on a screen 3.0 m from the slits. If the eighth order maximum occurs at an angle of 12.0, at what angle does the third order maximum occur
Solution :
Given the laser light which is sent through the double slit produces an interference pattern on the screen placed 3 meters from the slits.
The 8th order maximum occurs at angle = 12
So,
[tex]$8^{th} \text{ order maxima} = d \sin \theta = m \lambda$[/tex] , m = 8
[tex]$d = \frac{8 \lambda}{\sin 12}$[/tex]
[tex]$\frac{\lambda}{d}= \frac{\sin 12}{8}$[/tex]
[tex]$3^{rd} \text{ order maxima}= d \sin \theta_2 = m_2 \lambda$[/tex]
[tex]$\sin \theta_2 = \frac{m_2 \lambda}{d}=\frac{3 \lambda}{d}$[/tex] [tex]$=0.75\ {\sin 12}$[/tex]
[tex]$\theta_2 = \sin^{-1}\left(0.75\ \sin 12\right)$[/tex]
[tex]$ = \sin^{-1}\left(0.155)$[/tex]
[tex]$=8.91^\circ$[/tex]
a car drives 24 meters to the left in three seconds what is the velocity of the car?
Answer:
8 m/s to the left.
Explanation:
Applying,
V = d/t...................... Equation 1
Where V = Velocity of the car, d = distance, t = time
From the question,
Given: d = 24 meters, t = 3 seconds
Substitute these values into equation 1
V = 24/3
V = 8 m/s to the left.
Hence the velocity of the car is 8 m/s to the left.
When the light on the moon is increasing, what is it called
Answer:
Waxing Gibbous phase occurs when the Moon is mostly lit and the illuminated portion is egg-shaped (gibbous) with the eastern edge shaded. The amount of illuminated area visible is increasing from one day to the next which is what is meant by "waxing"
hope this helps
have a good day :)
Explanation:
Answer:
Hey mate.......
Explanation:
This is ur answer....
Waxing Gibbous phase occurs when the Moon is mostly lit and the illuminated portion is egg-shaped (gibbous) with the eastern edge shaded. The amount of illuminated area visible is increasing from one day to the next which is what is meant by "waxing".
Hope it helps!
Brainliest pls!
Follow me! ;)
define electric field intensity
Answer:
Electric field intensity is a Vector Field. Electric field intensity (E, N/C or V/m) is a vector field that quantifies the force experienced by a charged particle due to the influence of charge not associated with that particle
Explanation:
A spinning disc with a mass of 2.5kg and a radius of 0.80m is rotating with an angular velocity of 1.5 rad/s. A ball of clay with unknown mass is dropped onto the disk and sticks to the very edge causing the angular velocity of the disk to slow to 1.13 rad/s. What is the mass of the ball of clay
Answer:
M = 1.90 Kg
Explanation:
Given data: mass = 2.5 Kg
radius R = 0.8 m
angular velocity ω = 1.5 rad/s
Angular momentum L =0.5×Iω^2
Where, I is the moment of inertia of the spinning disc.
I = 0.5MR^2
I = 0.5×2.5×0.8^2
I = 0.8 Kg/m^2
Then L = 0.5×0.8×1.5^2 = 0.8×2.25 = 0.9 Kg-m^2/sec
Let unknown mass be M
New mass of disc = (2.5+M) Kg, R = 0.8 m
New I = 0.5(2.5+M)(0.8)^2
Since, angular momentum is conserved
Angular momentum before = angular momentum after
0.5×0.5(2.5+M)(0.8)^2×(1.13)^2 = 0.9
Solving for M we get
0.204304(2.5+M)=0.9
M = 1.90 Kg
10 A particle in circular motion performs 30 oscillations in 6
seconds. Its angular velocity is?
Explanation:
Let omega = angular velocity (in rad/s). Then
omega = (# of oscillations)/(6 s)
= (30 osc)/(6 s) = 5 osc/s
We need to convert this to rad/s:
omega = (5 osc/s)(2π rad/osc)
= 10π rad/s
= 31.4 rad/s
What is Hooke's law? what is meant by elastic limit?
please answer me
Answer:
Explanation:
The law is about how object will be deformed when certain amount force is applied. Elastic limit is a point where object will not return its previous shape after being deformed
Please help ASAP with questions
wHICH WAVES MOVE BY REPLACING ONE PARTICLE WITH ANOTHER?
A. LIGHT WAVES
B. SOUND WAVES
C. ELECTROSTATIC WAVES
D. ELECTROMAGNETIC WAVES
AGAIN IF ANYONE I KNOW SEES THIS IGNORE BC IM FINNA JUMP OFF A CLIFF
Answer:
I think it's B. Sound Waves
A 3 Volt battery is connected in series to three resistors: 4,6, and 2. Find the total current.
Answer:
using ohm's law I=3/12
I=250ma.
Isobaric process is one carried out at constant (A) Speed (B) Volume
(D) Temperature (E) Acceleration.
Answer:
Isobaric process is one carried out at constant Pressure.
Explanation:
An isobaric process is a process that takes place under constant pressure. The first law of thermodynamics can be written as follows for the Isobaric Process:
ΔQ = ΔU + PΔV
where,
ΔQ = Heat Transfer
ΔU = Change in Internal Energy of the System
P = Constant Pressure
ΔV = Chang in Volume of the System
In an isobaric process, heat supplied to the system is utilized to increase its internal energy and to do work.
Hence, all the options given are incorrect. The correct option is:
Isobaric process is one carried out at constant Pressure.
A driver fills an 18.9L steel gasoline can with gasoline at 15.0°C right up to the top. He forgets to replace the cap and leaves the can in the back of his truck. The temperature climbs to 30.0°C by 1pm. How much gasoline spills out of the can
Answer:
ΔV = 0.98 L
Explanation:
First, we will calculate the increased volume using Charles' Law:
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
where,
V₁ =initial volume = 18.9 L
V₂ = final volume = ?
T₁ = initial temperature = 15°C + 273 = 288 k
T₂ = final temperature = 30°C + 273 = 303 k
Therefore,
[tex]\frac{18.9\ L}{288\ k} = \frac{V_2}{303\ k}[/tex]
V₂ = 19.88 L
Now, we calculate the change in volume:
ΔV = V₂ - V₁ = 19.88L - 18.9 L
ΔV = 0.98 L
This is the volume of gasoline that will spill out.
What is hypothesis testing
a football player starts from rest and speeds up to a final velocity of 12 m/s. the speeding up takes a total of 6 seconds. what is the football players acceleration
Answer:
2 m/s²
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 0 m/s
Final velocity (v) = 12 m/s
Time (t) = 6 s
Acceleration (a) =?
The acceleration of the player can be obtained as follow:
v = u + at
12 = 0 + (a × 6)
12 = 6a
Divide both side by 6
a = 12 / 6
a = 2 m/s²
Thus, the acceleration of the player is 2 m/s²
80 POINTSSS
The picture above represents what kind of circuit?
open series circuit
open parallel circuit
closed series circuit
closed parallel circuit
Answer:
closed parallel circuit